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August 29, 2016 08:26
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| guessing that cell A2 is a 2 | |
| guessing that cell A3 is a 3 | |
| cell B1 is the only cell in the top-left box that can be a 6 | |
| guessing that cell A4 is a 4 | |
| cell A7 can only be a 8 | |
| cell A8 can only be a 7 | |
| cell A6 can only be a 6 | |
| cell B9 can only be a 2 | |
| cell C9 can only be a 4 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| cell J6 is the only cell in column 6 that can be a 2 | |
| cell J1 is the only cell in row J that can be a 9 | |
| cell C7 is the only cell in row C that can be a 9 | |
| cell B8 can only be a 3 | |
| cell B6 can only be a 7 | |
| cell B5 can only be a 5 | |
| cell B4 can only be a 8 | |
| cell B2 can only be a 9 | |
| cell C5 can only be a 2 | |
| cell C4 can only be a 3 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 3 | |
| cell H6 can only be a 9 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell G2 is the only cell in row G that can be a 4 | |
| cell F7 is the only cell in row F that can be a 4 | |
| cell E1 is the only cell in row E that can be a 4 | |
| cell H2 is the only cell in row H that can be a 3 | |
| cell H5 is the only cell in row H that can be a 4 | |
| cell J7 is the only cell in row J that can be a 3 | |
| cell D1 is the only cell in column 1 that can be a 7 | |
| cell E5 is the only cell in row E that can be a 7 | |
| cell J5 can only be a 1 | |
| cell F5 can only be a 6 | |
| cell D4 can only be a 1 | |
| cell J9 can only be a 8 | |
| cell D9 can only be a 6 | |
| cell H9 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 6 | |
| guessing that cell A6 is a 4 | |
| cell A7 can only be a 8 | |
| cell A8 can only be a 7 | |
| cell B9 can only be a 2 | |
| cell C9 can only be a 4 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| cell J6 is the only cell in column 6 that can be a 2 | |
| cell J1 is the only cell in row J that can be a 9 | |
| cell C7 is the only cell in row C that can be a 9 | |
| cell B8 can only be a 3 | |
| cell B6 can only be a 7 | |
| cell B5 can only be a 5 | |
| cell B4 can only be a 8 | |
| cell B2 can only be a 9 | |
| cell C5 can only be a 2 | |
| cell C4 can only be a 3 | |
| cell D6 can only be a 6 | |
| cell G6 can only be a 3 | |
| cell H6 can only be a 9 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell G7 is the only cell in row G that can be a 6 | |
| cell F7 can only be a 4 | |
| cell E7 can only be a 5 | |
| cell H9 can only be a 8 | |
| cell J7 can only be a 3 | |
| cell J9 can only be a 1 | |
| cell D9 can only be a 7 | |
| cell F9 can only be a 6 | |
| cell G8 can only be a 5 | |
| cell G2 can only be a 4 | |
| cell E2 can only be a 1 | |
| cell F2 can only be a 8 | |
| cell D2 can only be a 5 | |
| cell D1 can only be a 4 | |
| cell D4 can only be a 1 | |
| no 1s can be placed in row G | |
| backtracking | |
| guessing that cell A6 is a 7 | |
| cell A8 can only be a 8 | |
| cell A7 can only be a 4 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| guessing that cell B2 is a 5 | |
| cell B5 can only be a 2 | |
| cell B6 can only be a 3 | |
| cell B4 can only be a 8 | |
| cell B8 can only be a 9 | |
| cell C3 can only be a 8 | |
| cell C1 can only be a 9 | |
| cell C7 can only be a 3 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell J6 is the only cell in row J that can be a 2 | |
| no 9s can be placed in row J | |
| backtracking | |
| guessing that cell B2 is a 8 | |
| cell C3 can only be a 5 | |
| cell C1 can only be a 9 | |
| cell C5 can only be a 4 | |
| cell C7 can only be a 3 | |
| cell B8 can only be a 9 | |
| cell C4 can only be a 8 | |
| cell G3 can only be a 7 | |
| cell J3 can only be a 8 | |
| cell J1 can only be a 5 | |
| cell J7 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B8 can only be a 3 | |
| cell B6 can only be a 2 | |
| cell B5 can only be a 5 | |
| cell B4 can only be a 8 | |
| cell C5 can only be a 4 | |
| cell C4 can only be a 3 | |
| cell C7 can only be a 9 | |
| cell H5 can only be a 6 | |
| cell H9 can only be a 8 | |
| cell J9 can only be a 1 | |
| cell G8 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell J7 can only be a 3 | |
| cell G7 can only be a 6 | |
| cell E7 can only be a 5 | |
| cell F7 can only be a 8 | |
| cell J6 can only be a 9 | |
| cell E3 is the only cell in row E that can be a 6 | |
| cell F3 can only be a 2 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell F9 is the only cell in row F that can be a 6 | |
| cell D9 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell F2 is the only cell in row F that can be a 4 | |
| cell E1 can only be a 7 | |
| cell E2 can only be a 1 | |
| cell E5 can only be a 2 | |
| cell E4 can only be a 4 | |
| cell G2 can only be a 3 | |
| cell G4 can only be a 1 | |
| cell D4 can only be a 7 | |
| cell D8 can only be a 1 | |
| cell F5 can only be a 1 | |
| cell F8 can only be a 7 | |
| cell G6 can only be a 4 | |
| cell H2 can only be a 5 | |
| cell H4 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| cell A6 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 7 | |
| cell A8 can only be a 8 | |
| cell A7 can only be a 4 | |
| cell A6 can only be a 6 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| guessing that cell B2 is a 5 | |
| cell B5 can only be a 2 | |
| cell B6 can only be a 3 | |
| cell B4 can only be a 8 | |
| cell B8 can only be a 9 | |
| cell C3 can only be a 8 | |
| cell C1 can only be a 9 | |
| cell C7 can only be a 3 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell J6 is the only cell in row J that can be a 2 | |
| no 9s can be placed in row J | |
| backtracking | |
| guessing that cell B2 is a 8 | |
| cell C3 can only be a 5 | |
| cell C1 can only be a 9 | |
| cell C5 can only be a 4 | |
| cell C7 can only be a 3 | |
| cell B8 can only be a 9 | |
| cell C4 can only be a 8 | |
| cell G3 can only be a 7 | |
| cell J3 can only be a 8 | |
| cell J1 can only be a 5 | |
| cell J7 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B8 can only be a 3 | |
| cell B6 can only be a 2 | |
| cell B5 can only be a 5 | |
| cell B4 can only be a 8 | |
| cell C5 can only be a 4 | |
| cell C4 can only be a 3 | |
| cell C7 can only be a 9 | |
| cell H5 can only be a 6 | |
| cell H9 can only be a 8 | |
| cell J9 can only be a 1 | |
| cell G8 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell J7 can only be a 3 | |
| cell G7 can only be a 6 | |
| cell E7 can only be a 5 | |
| cell F7 can only be a 8 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell G4 is the only cell in row G that can be a 1 | |
| cell D2 is the only cell in column 2 that can be a 8 | |
| cell D8 is the only cell in row D that can be a 1 | |
| cell F8 can only be a 7 | |
| cell D1 is the only cell in row D that can be a 5 | |
| cell C1 can only be a 8 | |
| cell C3 can only be a 5 | |
| cell J1 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 7 | |
| cell G2 can only be a 3 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 7 | |
| cell J6 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 8 | |
| cell A7 can only be a 4 | |
| cell A8 can only be a 7 | |
| cell A6 can only be a 6 | |
| guessing that cell B2 is a 5 | |
| cell C3 can only be a 8 | |
| cell C1 can only be a 9 | |
| cell C7 can only be a 3 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 8 | |
| cell B8 can only be a 9 | |
| cell H9 can only be a 6 | |
| cell G7 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell J3 can only be a 5 | |
| cell J1 can only be a 8 | |
| cell J7 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 8 | |
| cell B9 can only be a 2 | |
| cell C3 can only be a 5 | |
| cell C1 can only be a 9 | |
| cell C9 can only be a 8 | |
| cell C7 can only be a 3 | |
| cell B8 can only be a 9 | |
| cell G3 can only be a 7 | |
| cell H9 can only be a 6 | |
| cell G7 can only be a 5 | |
| cell J3 can only be a 8 | |
| cell J7 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell C7 is the only cell in row C that can be a 9 | |
| cell C4 is the only cell in row C that can be a 3 | |
| cell B8 is the only cell in row B that can be a 3 | |
| cell B9 is the only cell in row B that can be a 8 | |
| cell C9 can only be a 2 | |
| cell H9 can only be a 6 | |
| cell J9 can only be a 1 | |
| cell G8 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell G7 can only be a 3 | |
| cell G2 can only be a 4 | |
| cell G6 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| cell A4 cannot be filled | |
| backtracking | |
| guessing that cell A3 is a 6 | |
| guessing that cell A4 is a 3 | |
| guessing that cell A6 is a 4 | |
| cell A7 can only be a 8 | |
| cell A8 can only be a 7 | |
| cell B9 can only be a 2 | |
| cell C9 can only be a 4 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| cell J6 is the only cell in column 6 that can be a 2 | |
| cell J1 is the only cell in row J that can be a 9 | |
| cell C7 is the only cell in row C that can be a 9 | |
| cell B8 can only be a 3 | |
| cell B2 is the only cell in row B that can be a 9 | |
| cell C3 is the only cell in row C that can be a 3 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell H6 is the only cell in row H that can be a 9 | |
| cell H2 is the only cell in row H that can be a 3 | |
| cell J7 is the only cell in row J that can be a 3 | |
| cell G6 is the only cell in row G that can be a 3 | |
| guessing that cell B1 is a 5 | |
| cell C1 can only be a 8 | |
| cell H1 can only be a 4 | |
| cell G2 can only be a 5 | |
| no 5s can be placed in the bottom-right box | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| cell C1 can only be a 5 | |
| cell C5 can only be a 2 | |
| cell C4 can only be a 8 | |
| cell H1 can only be a 4 | |
| cell G2 can only be a 5 | |
| no 5s can be placed in the bottom-right box | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A6 is a 7 | |
| cell A8 can only be a 8 | |
| cell A7 can only be a 4 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| guessing that cell B1 is a 5 | |
| guessing that cell B2 is a 3 | |
| cell B8 can only be a 9 | |
| cell C3 can only be a 8 | |
| cell C1 can only be a 9 | |
| cell C7 can only be a 3 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell H6 is the only cell in row H that can be a 3 | |
| cell H2 is the only cell in row H that can be a 9 | |
| cell J3 is the only cell in row J that can be a 3 | |
| cell G8 is the only cell in row G that can be a 3 | |
| cell G4 is the only cell in row G that can be a 1 | |
| cell G3 is the only cell in row G that can be a 7 | |
| cell F3 can only be a 2 | |
| cell E3 can only be a 5 | |
| cell J1 can only be a 8 | |
| cell H1 can only be a 4 | |
| cell G2 can only be a 5 | |
| cell G7 can only be a 6 | |
| cell F7 can only be a 8 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell B6 can only be a 2 | |
| cell B5 can only be a 6 | |
| cell D1 can only be a 7 | |
| cell D4 can only be a 4 | |
| cell C4 can only be a 5 | |
| cell C5 can only be a 4 | |
| cell D9 can only be a 1 | |
| cell J9 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 8 | |
| cell C1 can only be a 9 | |
| cell C3 can only be a 3 | |
| cell C7 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B8 can only be a 3 | |
| cell C1 can only be a 8 | |
| cell C3 can only be a 3 | |
| cell C7 can only be a 9 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell E8 is the only cell in row E that can be a 9 | |
| guessing that cell B5 is a 2 | |
| cell B6 can only be a 6 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 3 | |
| cell H6 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell G2 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell G7 can only be a 6 | |
| cell E7 can only be a 5 | |
| no 5s can be placed in row D | |
| backtracking | |
| guessing that cell B5 is a 6 | |
| cell B6 can only be a 2 | |
| guessing that cell C4 is a 4 | |
| cell C5 can only be a 5 | |
| cell H5 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell J1 can only be a 7 | |
| cell G3 can only be a 5 | |
| cell G8 can only be a 1 | |
| cell F8 can only be a 7 | |
| cell D8 can only be a 5 | |
| cell E7 can only be a 6 | |
| no 6s can be placed in row F | |
| backtracking | |
| guessing that cell C4 is a 5 | |
| cell C5 can only be a 4 | |
| cell H5 can only be a 5 | |
| guessing that cell D1 is a 4 | |
| cell D6 can only be a 6 | |
| cell H1 can only be a 9 | |
| cell J1 can only be a 7 | |
| cell E1 can only be a 6 | |
| cell E7 can only be a 5 | |
| cell E2 can only be a 1 | |
| cell F2 can only be a 8 | |
| cell D2 can only be a 5 | |
| cell F7 can only be a 6 | |
| cell G3 can only be a 5 | |
| no 5s can be placed in row J | |
| backtracking | |
| guessing that cell D1 is a 6 | |
| cell D6 can only be a 4 | |
| cell F9 is the only cell in column 9 that can be a 4 | |
| cell F7 is the only cell in row F that can be a 6 | |
| cell E7 can only be a 5 | |
| cell G7 can only be a 3 | |
| cell G6 can only be a 6 | |
| cell H4 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell H6 can only be a 3 | |
| no 3s can be placed in row J | |
| backtracking | |
| guessing that cell D1 is a 7 | |
| cell J1 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 6 | |
| cell E7 can only be a 5 | |
| cell D8 can only be a 1 | |
| cell E3 can only be a 2 | |
| cell F3 can only be a 8 | |
| cell F7 can only be a 6 | |
| cell F8 can only be a 7 | |
| cell F9 can only be a 4 | |
| cell D9 can only be a 8 | |
| cell F2 can only be a 1 | |
| cell E2 can only be a 4 | |
| cell D2 can only be a 5 | |
| cell F5 can only be a 2 | |
| cell G2 can only be a 3 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| cell C4 cannot be filled | |
| backtracking | |
| cell B5 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| cell C4 is the only cell in row C that can be a 8 | |
| cell C5 is the only cell in row C that can be a 4 | |
| guessing that cell B2 is a 3 | |
| cell B8 can only be a 9 | |
| cell C3 can only be a 5 | |
| cell C1 can only be a 9 | |
| cell C7 can only be a 3 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell H6 is the only cell in row H that can be a 3 | |
| cell H2 is the only cell in row H that can be a 9 | |
| cell H9 is the only cell in row H that can be a 8 | |
| cell J7 can only be a 5 | |
| cell G7 can only be a 6 | |
| cell F7 can only be a 8 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell B6 can only be a 2 | |
| cell G2 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell J1 can only be a 7 | |
| cell D1 can only be a 5 | |
| cell E1 can only be a 6 | |
| cell G3 can only be a 3 | |
| no 3s can be placed in row J | |
| backtracking | |
| guessing that cell B2 is a 5 | |
| no 5s can be placed in row C | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B8 can only be a 3 | |
| cell C1 can only be a 5 | |
| cell C3 can only be a 3 | |
| cell C7 can only be a 9 | |
| cell E8 is the only cell in row E that can be a 9 | |
| guessing that cell B4 is a 2 | |
| cell B6 can only be a 6 | |
| cell B5 can only be a 5 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 3 | |
| cell H5 can only be a 6 | |
| cell H6 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell G2 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell G7 can only be a 6 | |
| cell E7 can only be a 5 | |
| no 5s can be placed in row D | |
| backtracking | |
| guessing that cell B4 is a 5 | |
| guessing that cell B5 is a 2 | |
| cell B6 can only be a 6 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 3 | |
| cell H6 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell G2 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell G7 can only be a 6 | |
| cell E7 can only be a 5 | |
| no 5s can be placed in row D | |
| backtracking | |
| guessing that cell B5 is a 6 | |
| cell B6 can only be a 2 | |
| cell H5 can only be a 5 | |
| guessing that cell D1 is a 4 | |
| cell D6 can only be a 6 | |
| cell H1 can only be a 9 | |
| cell J1 can only be a 7 | |
| cell E1 can only be a 6 | |
| cell E7 can only be a 5 | |
| cell E2 can only be a 1 | |
| cell F2 can only be a 8 | |
| cell D2 can only be a 5 | |
| cell F7 can only be a 6 | |
| cell G3 can only be a 5 | |
| no 5s can be placed in row J | |
| backtracking | |
| guessing that cell D1 is a 6 | |
| cell D6 can only be a 4 | |
| cell F9 is the only cell in column 9 that can be a 4 | |
| cell F7 is the only cell in row F that can be a 6 | |
| cell E7 can only be a 5 | |
| cell G7 can only be a 3 | |
| cell G6 can only be a 6 | |
| cell H4 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell H6 can only be a 3 | |
| no 3s can be placed in row J | |
| backtracking | |
| guessing that cell D1 is a 7 | |
| cell J1 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 6 | |
| cell E7 can only be a 5 | |
| cell D8 can only be a 1 | |
| cell E3 can only be a 2 | |
| cell F3 can only be a 8 | |
| cell F7 can only be a 6 | |
| cell F8 can only be a 7 | |
| cell F9 can only be a 4 | |
| cell D9 can only be a 8 | |
| cell F2 can only be a 1 | |
| cell E2 can only be a 4 | |
| cell D2 can only be a 5 | |
| cell F5 can only be a 2 | |
| cell G2 can only be a 3 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| cell B5 cannot be filled | |
| backtracking | |
| guessing that cell B4 is a 6 | |
| cell B6 can only be a 2 | |
| cell B5 can only be a 5 | |
| cell H5 can only be a 6 | |
| cell H9 can only be a 8 | |
| cell J9 can only be a 1 | |
| cell G8 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell J1 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell G2 can only be a 3 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell D1 can only be a 7 | |
| cell D8 can only be a 1 | |
| cell D4 can only be a 4 | |
| cell D9 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 9 | |
| cell B8 can only be a 3 | |
| cell C7 can only be a 9 | |
| cell C3 is the only cell in row C that can be a 3 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell J6 is the only cell in row J that can be a 9 | |
| cell H2 is the only cell in row H that can be a 9 | |
| cell H6 is the only cell in row H that can be a 3 | |
| cell J7 is the only cell in row J that can be a 3 | |
| cell G2 is the only cell in row G that can be a 3 | |
| cell B6 is the only cell in column 6 that can be a 2 | |
| cell F7 is the only cell in column 7 that can be a 8 | |
| cell J3 is the only cell in column 3 that can be a 8 | |
| cell J9 can only be a 1 | |
| cell G8 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell F3 can only be a 2 | |
| cell E3 can only be a 5 | |
| no 5s can be placed in row D | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| cell A6 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 4 | |
| guessing that cell A6 is a 3 | |
| cell A7 can only be a 8 | |
| cell A8 can only be a 7 | |
| cell B9 can only be a 2 | |
| cell C9 can only be a 4 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| cell J6 is the only cell in column 6 that can be a 2 | |
| cell J1 is the only cell in row J that can be a 9 | |
| cell C7 is the only cell in row C that can be a 9 | |
| cell B8 can only be a 3 | |
| cell B2 is the only cell in row B that can be a 9 | |
| cell C3 is the only cell in row C that can be a 3 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell H6 is the only cell in row H that can be a 9 | |
| guessing that cell B1 is a 5 | |
| cell C1 can only be a 8 | |
| cell H1 can only be a 4 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell G6 is the only cell in row G that can be a 4 | |
| cell D2 is the only cell in row D that can be a 4 | |
| cell D8 is the only cell in row D that can be a 5 | |
| cell G8 can only be a 1 | |
| cell F8 can only be a 8 | |
| no 8s can be placed in row D | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| cell C1 can only be a 5 | |
| cell C5 can only be a 2 | |
| cell C4 can only be a 8 | |
| cell H1 can only be a 4 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell G6 is the only cell in row G that can be a 4 | |
| cell D2 is the only cell in row D that can be a 4 | |
| cell D8 is the only cell in row D that can be a 5 | |
| cell G8 can only be a 1 | |
| cell F8 can only be a 8 | |
| no 8s can be placed in row D | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A6 is a 7 | |
| guessing that cell A7 is a 3 | |
| cell A8 can only be a 8 | |
| guessing that cell B1 is a 5 | |
| guessing that cell B2 is a 3 | |
| cell C3 can only be a 8 | |
| cell C1 can only be a 9 | |
| cell C7 can only be a 4 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell B8 can only be a 9 | |
| cell C5 can only be a 5 | |
| cell C4 can only be a 3 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell J6 is the only cell in row J that can be a 9 | |
| cell H2 is the only cell in row H that can be a 9 | |
| cell J3 is the only cell in row J that can be a 3 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| cell H6 is the only cell in row H that can be a 3 | |
| cell G8 is the only cell in row G that can be a 3 | |
| cell G4 is the only cell in row G that can be a 1 | |
| cell G3 is the only cell in row G that can be a 7 | |
| cell F3 can only be a 2 | |
| cell E3 can only be a 5 | |
| cell J1 can only be a 8 | |
| cell H1 can only be a 4 | |
| cell G2 can only be a 5 | |
| cell G7 can only be a 6 | |
| cell F7 can only be a 8 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell B6 can only be a 2 | |
| cell B5 can only be a 6 | |
| cell H5 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 8 | |
| cell C1 can only be a 9 | |
| cell C3 can only be a 3 | |
| cell C7 can only be a 4 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell B8 can only be a 9 | |
| cell C5 can only be a 5 | |
| cell C4 can only be a 8 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell J6 is the only cell in row J that can be a 9 | |
| cell H2 is the only cell in row H that can be a 9 | |
| cell J4 is the only cell in row J that can be a 3 | |
| cell B6 is the only cell in row B that can be a 3 | |
| cell H8 is the only cell in row H that can be a 3 | |
| no 2s can be placed in column 8 | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell C1 can only be a 8 | |
| cell C3 can only be a 3 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell B6 is the only cell in row B that can be a 3 | |
| cell B5 is the only cell in row B that can be a 6 | |
| cell C7 is the only cell in row C that can be a 9 | |
| cell C9 is the only cell in row C that can be a 4 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell J4 is the only cell in row J that can be a 3 | |
| guessing that cell B8 is a 2 | |
| cell B9 can only be a 7 | |
| guessing that cell C4 is a 2 | |
| cell C5 can only be a 5 | |
| guessing that cell D1 is a 4 | |
| cell D6 can only be a 6 | |
| cell G6 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell H5 can only be a 2 | |
| cell H6 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 6 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 6 | |
| cell G7 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell G4 can only be a 1 | |
| cell D4 can only be a 7 | |
| cell E4 can only be a 6 | |
| cell E7 can only be a 4 | |
| cell E1 can only be a 7 | |
| cell G8 can only be a 3 | |
| cell H8 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 7 | |
| cell J1 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 6 | |
| cell H5 can only be a 2 | |
| cell J6 cannot be filled | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| guessing that cell C4 is a 5 | |
| cell C5 can only be a 2 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell H4 can only be a 6 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell H5 can only be a 5 | |
| cell H8 can only be a 3 | |
| cell G2 is the only cell in row G that can be a 3 | |
| cell G7 is the only cell in row G that can be a 6 | |
| cell E1 is the only cell in row E that can be a 6 | |
| cell F9 is the only cell in row F that can be a 6 | |
| cell J3 is the only cell in column 3 that can be a 8 | |
| cell H2 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell H6 can only be a 2 | |
| cell H9 can only be a 8 | |
| cell D9 can only be a 1 | |
| cell D4 can only be a 7 | |
| cell D1 can only be a 4 | |
| cell D8 can only be a 5 | |
| cell D2 can only be a 8 | |
| cell E7 can only be a 4 | |
| cell E5 can only be a 1 | |
| no 1s can be placed in row J | |
| backtracking | |
| cell C4 cannot be filled | |
| backtracking | |
| guessing that cell B8 is a 7 | |
| cell B9 can only be a 2 | |
| cell F8 can only be a 1 | |
| cell D8 can only be a 5 | |
| cell G8 can only be a 3 | |
| cell H8 can only be a 2 | |
| cell G4 is the only cell in row G that can be a 1 | |
| cell D2 is the only cell in row D that can be a 1 | |
| cell D9 is the only cell in row D that can be a 8 | |
| cell H9 can only be a 6 | |
| cell F9 can only be a 7 | |
| cell G7 can only be a 5 | |
| cell G2 can only be a 4 | |
| cell E2 can only be a 5 | |
| cell F2 can only be a 8 | |
| no 8s can be placed in row H | |
| backtracking | |
| cell B8 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| cell C4 is the only cell in row C that can be a 8 | |
| cell C3 is the only cell in row C that can be a 3 | |
| guessing that cell B2 is a 5 | |
| cell C1 can only be a 9 | |
| cell C7 can only be a 4 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell B8 can only be a 9 | |
| cell C5 can only be a 5 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell J6 is the only cell in row J that can be a 9 | |
| cell H2 is the only cell in row H that can be a 9 | |
| cell H9 is the only cell in row H that can be a 8 | |
| cell J7 can only be a 5 | |
| cell G7 can only be a 6 | |
| cell F7 can only be a 8 | |
| cell J1 can only be a 7 | |
| cell G3 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell G2 can only be a 3 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell D1 can only be a 5 | |
| cell E1 can only be a 6 | |
| cell G8 can only be a 1 | |
| cell J9 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell C1 can only be a 5 | |
| cell C5 can only be a 2 | |
| cell C9 can only be a 4 | |
| cell C7 can only be a 9 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell J3 is the only cell in column 3 that can be a 8 | |
| cell J7 can only be a 5 | |
| cell G7 can only be a 6 | |
| cell E7 can only be a 4 | |
| cell F7 can only be a 8 | |
| cell D2 is the only cell in row D that can be a 8 | |
| cell D8 is the only cell in row D that can be a 5 | |
| cell H9 is the only cell in row H that can be a 8 | |
| guessing that cell B4 is a 3 | |
| cell B6 can only be a 6 | |
| cell B5 can only be a 5 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 3 | |
| no 3s can be placed in row J | |
| backtracking | |
| guessing that cell B4 is a 5 | |
| cell B5 can only be a 6 | |
| cell B6 can only be a 3 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell H5 can only be a 5 | |
| cell D1 is the only cell in row D that can be a 4 | |
| cell F2 can only be a 1 | |
| cell E2 can only be a 5 | |
| cell E3 can only be a 7 | |
| cell E1 can only be a 6 | |
| cell E5 can only be a 1 | |
| cell D4 can only be a 7 | |
| no 7s can be placed in row G | |
| backtracking | |
| guessing that cell B4 is a 6 | |
| cell B5 can only be a 5 | |
| cell B6 can only be a 3 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell H5 can only be a 6 | |
| cell D1 is the only cell in row D that can be a 4 | |
| cell F2 can only be a 1 | |
| cell E2 can only be a 5 | |
| cell E3 can only be a 7 | |
| cell E1 can only be a 6 | |
| cell E5 can only be a 1 | |
| cell D4 can only be a 7 | |
| no 7s can be placed in row G | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 9 | |
| cell C7 is the only cell in row C that can be a 9 | |
| cell C9 is the only cell in row C that can be a 4 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell J6 is the only cell in row J that can be a 9 | |
| cell H2 is the only cell in row H that can be a 9 | |
| guessing that cell B2 is a 3 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell B5 is the only cell in row B that can be a 5 | |
| cell C5 can only be a 2 | |
| cell B6 can only be a 6 | |
| cell C4 can only be a 3 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 3 | |
| cell H6 can only be a 2 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell G2 is the only cell in row G that can be a 4 | |
| cell F7 is the only cell in row F that can be a 4 | |
| cell E1 is the only cell in row E that can be a 4 | |
| cell H8 is the only cell in row H that can be a 3 | |
| cell H5 is the only cell in row H that can be a 4 | |
| cell J9 is the only cell in row J that can be a 2 | |
| cell B9 can only be a 7 | |
| cell B8 can only be a 2 | |
| cell J3 is the only cell in row J that can be a 3 | |
| cell D1 is the only cell in column 1 that can be a 6 | |
| cell J1 is the only cell in column 1 that can be a 7 | |
| cell G3 can only be a 5 | |
| cell C3 can only be a 8 | |
| cell C1 can only be a 5 | |
| cell E3 can only be a 7 | |
| cell G7 can only be a 6 | |
| cell E7 can only be a 5 | |
| no 5s can be placed in column 8 | |
| backtracking | |
| guessing that cell B2 is a 5 | |
| cell C1 can only be a 8 | |
| cell C3 can only be a 3 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell B6 is the only cell in row B that can be a 3 | |
| cell B5 is the only cell in row B that can be a 6 | |
| cell H9 is the only cell in row H that can be a 8 | |
| cell J7 can only be a 5 | |
| cell G7 can only be a 6 | |
| cell E7 can only be a 4 | |
| cell E2 can only be a 1 | |
| cell F7 can only be a 8 | |
| cell F2 can only be a 4 | |
| cell D2 can only be a 8 | |
| cell G2 can only be a 3 | |
| cell G6 can only be a 4 | |
| no 4s can be placed in row D | |
| backtracking | |
| guessing that cell B2 is a 8 | |
| cell C1 can only be a 5 | |
| cell C3 can only be a 3 | |
| cell C5 can only be a 2 | |
| cell C4 can only be a 8 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell J9 is the only cell in row J that can be a 2 | |
| cell B9 can only be a 7 | |
| cell B8 can only be a 2 | |
| cell H6 is the only cell in row H that can be a 2 | |
| cell J4 is the only cell in row J that can be a 3 | |
| cell B6 is the only cell in row B that can be a 3 | |
| cell H8 is the only cell in row H that can be a 3 | |
| cell G2 is the only cell in row G that can be a 3 | |
| cell G6 is the only cell in row G that can be a 4 | |
| cell D6 can only be a 6 | |
| cell H1 is the only cell in row H that can be a 4 | |
| cell D2 is the only cell in row D that can be a 4 | |
| cell F2 can only be a 1 | |
| cell E2 can only be a 5 | |
| cell E3 can only be a 7 | |
| cell D1 can only be a 8 | |
| cell D9 can only be a 1 | |
| cell D4 can only be a 7 | |
| no 7s can be placed in row G | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A7 is a 8 | |
| cell A8 can only be a 3 | |
| guessing that cell B1 is a 5 | |
| guessing that cell B2 is a 3 | |
| cell C3 can only be a 8 | |
| cell C1 can only be a 9 | |
| cell C7 can only be a 4 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell B8 can only be a 9 | |
| cell C5 can only be a 5 | |
| cell C4 can only be a 3 | |
| cell F7 can only be a 6 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell H6 is the only cell in row H that can be a 3 | |
| cell H2 is the only cell in row H that can be a 9 | |
| cell J6 is the only cell in row J that can be a 9 | |
| cell B6 is the only cell in column 6 that can be a 2 | |
| cell B5 can only be a 6 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| cell H5 can only be a 4 | |
| cell G6 can only be a 6 | |
| cell D6 can only be a 4 | |
| cell H1 can only be a 8 | |
| cell H4 can only be a 5 | |
| cell H9 can only be a 6 | |
| cell J1 can only be a 7 | |
| cell D1 can only be a 6 | |
| cell E1 can only be a 4 | |
| cell E4 is the only cell in row E that can be a 6 | |
| cell F9 is the only cell in row F that can be a 4 | |
| cell G2 is the only cell in row G that can be a 4 | |
| cell G4 is the only cell in row G that can be a 7 | |
| cell D4 can only be a 1 | |
| cell D9 can only be a 8 | |
| no 8s can be placed in row J | |
| backtracking | |
| guessing that cell B2 is a 8 | |
| cell C1 can only be a 9 | |
| cell C3 can only be a 3 | |
| cell C7 can only be a 4 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell B8 can only be a 9 | |
| cell C5 can only be a 5 | |
| cell C4 can only be a 8 | |
| cell F7 can only be a 6 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell J6 is the only cell in row J that can be a 9 | |
| cell H2 is the only cell in row H that can be a 9 | |
| cell G2 is the only cell in column 2 that can be a 3 | |
| cell G7 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell G8 can only be a 1 | |
| cell G4 can only be a 6 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell H5 can only be a 2 | |
| no 2s can be placed in row J | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell C1 can only be a 8 | |
| cell C3 can only be a 3 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell B6 is the only cell in row B that can be a 3 | |
| cell B5 is the only cell in row B that can be a 6 | |
| cell C7 is the only cell in row C that can be a 9 | |
| cell C9 is the only cell in row C that can be a 4 | |
| cell E8 is the only cell in row E that can be a 9 | |
| guessing that cell B8 is a 2 | |
| cell B9 can only be a 7 | |
| guessing that cell C4 is a 2 | |
| cell C5 can only be a 5 | |
| guessing that cell D1 is a 4 | |
| cell D6 can only be a 6 | |
| cell G6 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell H5 can only be a 2 | |
| cell H6 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 6 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 6 | |
| cell G2 is the only cell in row G that can be a 4 | |
| cell H1 can only be a 9 | |
| cell H6 can only be a 2 | |
| cell H5 can only be a 4 | |
| cell J1 can only be a 7 | |
| cell E1 can only be a 4 | |
| cell G3 can only be a 5 | |
| cell G7 can only be a 3 | |
| cell G8 can only be a 1 | |
| cell G4 can only be a 7 | |
| cell D4 can only be a 1 | |
| cell D9 can only be a 8 | |
| cell D2 can only be a 5 | |
| cell D8 can only be a 7 | |
| cell F8 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 7 | |
| cell J1 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 6 | |
| cell H5 can only be a 2 | |
| cell J6 cannot be filled | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| guessing that cell C4 is a 5 | |
| cell C5 can only be a 2 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell J3 is the only cell in column 3 that can be a 8 | |
| guessing that cell D1 is a 4 | |
| cell D6 can only be a 6 | |
| cell G6 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell H5 can only be a 5 | |
| cell H6 can only be a 2 | |
| cell H8 can only be a 8 | |
| cell H9 can only be a 6 | |
| cell H4 can only be a 3 | |
| cell H2 can only be a 4 | |
| cell J1 can only be a 7 | |
| cell E1 can only be a 6 | |
| cell G3 can only be a 5 | |
| cell E3 can only be a 7 | |
| cell G2 can only be a 3 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 6 | |
| no 6s can be placed in the center box | |
| backtracking | |
| guessing that cell D1 is a 7 | |
| cell E3 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell J1 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 6 | |
| cell E7 can only be a 4 | |
| cell E2 can only be a 1 | |
| cell E5 can only be a 7 | |
| cell F7 can only be a 6 | |
| cell H5 can only be a 5 | |
| cell H2 can only be a 3 | |
| cell G2 can only be a 5 | |
| cell G7 can only be a 3 | |
| cell G8 can only be a 1 | |
| cell G4 can only be a 6 | |
| cell H4 cannot be filled | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| cell C4 cannot be filled | |
| backtracking | |
| guessing that cell B8 is a 7 | |
| cell B9 can only be a 2 | |
| cell H8 is the only cell in column 8 that can be a 2 | |
| cell J6 is the only cell in column 6 that can be a 2 | |
| cell J1 is the only cell in row J that can be a 9 | |
| cell H1 can only be a 4 | |
| cell H5 can only be a 5 | |
| cell C5 can only be a 2 | |
| cell C4 can only be a 5 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell G6 is the only cell in row G that can be a 4 | |
| cell D6 can only be a 6 | |
| cell D1 can only be a 7 | |
| cell D4 can only be a 1 | |
| cell D9 can only be a 8 | |
| no 8s can be placed in column 8 | |
| backtracking | |
| cell B8 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| cell C4 is the only cell in row C that can be a 8 | |
| cell C3 is the only cell in row C that can be a 3 | |
| guessing that cell B2 is a 5 | |
| cell C1 can only be a 9 | |
| cell C7 can only be a 4 | |
| cell C9 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell B8 can only be a 9 | |
| cell C5 can only be a 5 | |
| cell F7 can only be a 6 | |
| cell E7 is the only cell in row E that can be a 9 | |
| cell J6 is the only cell in row J that can be a 9 | |
| cell H2 is the only cell in row H that can be a 9 | |
| cell G2 is the only cell in column 2 that can be a 3 | |
| cell G7 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell G8 can only be a 1 | |
| cell G4 can only be a 6 | |
| cell G6 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell H5 can only be a 2 | |
| no 2s can be placed in row J | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell C1 can only be a 5 | |
| cell C5 can only be a 2 | |
| cell C9 can only be a 4 | |
| cell C7 can only be a 9 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell F3 is the only cell in row F that can be a 2 | |
| cell E4 is the only cell in row E that can be a 2 | |
| cell J3 is the only cell in column 3 that can be a 8 | |
| guessing that cell B4 is a 3 | |
| cell B6 can only be a 6 | |
| cell B5 can only be a 5 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 3 | |
| cell G2 is the only cell in row G that can be a 4 | |
| cell H1 can only be a 9 | |
| cell H6 can only be a 2 | |
| cell J1 can only be a 7 | |
| cell D1 can only be a 6 | |
| cell E1 can only be a 4 | |
| cell G3 can only be a 5 | |
| cell E3 can only be a 7 | |
| cell G7 can only be a 6 | |
| cell E7 can only be a 5 | |
| cell E2 can only be a 1 | |
| cell E5 can only be a 6 | |
| cell F2 can only be a 8 | |
| cell D2 can only be a 5 | |
| cell F7 can only be a 4 | |
| cell G8 can only be a 1 | |
| cell F8 can only be a 7 | |
| no 7s can be placed in column 5 | |
| backtracking | |
| guessing that cell B4 is a 5 | |
| cell B5 can only be a 6 | |
| cell B6 can only be a 3 | |
| guessing that cell B8 is a 2 | |
| cell B9 can only be a 7 | |
| guessing that cell D1 is a 4 | |
| cell D6 can only be a 6 | |
| cell G6 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell H5 can only be a 5 | |
| cell H6 can only be a 2 | |
| cell H8 can only be a 8 | |
| cell H9 can only be a 6 | |
| cell H4 can only be a 3 | |
| cell H2 can only be a 4 | |
| cell J1 can only be a 7 | |
| cell E1 can only be a 6 | |
| cell G3 can only be a 5 | |
| cell E3 can only be a 7 | |
| cell G2 can only be a 3 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 6 | |
| no 6s can be placed in the center box | |
| backtracking | |
| guessing that cell D1 is a 7 | |
| cell E3 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell J1 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 6 | |
| cell E7 can only be a 4 | |
| cell E2 can only be a 1 | |
| cell E5 can only be a 7 | |
| cell F7 can only be a 6 | |
| cell H5 can only be a 5 | |
| cell H2 can only be a 3 | |
| cell G2 can only be a 5 | |
| cell G7 can only be a 3 | |
| cell G8 can only be a 1 | |
| cell G4 can only be a 6 | |
| cell H4 cannot be filled | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| guessing that cell B8 is a 7 | |
| cell B9 can only be a 2 | |
| cell J9 can only be a 1 | |
| cell G8 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell E3 can only be a 5 | |
| no 5s can be placed in row D | |
| backtracking | |
| cell B8 cannot be filled | |
| backtracking | |
| guessing that cell B4 is a 6 | |
| cell B5 can only be a 5 | |
| cell B6 can only be a 3 | |
| guessing that cell B8 is a 2 | |
| cell B9 can only be a 7 | |
| guessing that cell D1 is a 4 | |
| cell D6 can only be a 6 | |
| cell G6 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell H5 can only be a 6 | |
| cell H6 can only be a 2 | |
| cell H9 can only be a 8 | |
| cell D9 can only be a 1 | |
| cell D4 can only be a 7 | |
| cell F9 can only be a 6 | |
| cell F7 can only be a 4 | |
| cell E7 can only be a 5 | |
| cell D8 can only be a 8 | |
| cell D2 can only be a 5 | |
| cell E2 can only be a 1 | |
| cell E3 can only be a 7 | |
| no 7s can be placed in row G | |
| backtracking | |
| guessing that cell D1 is a 6 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 6 | |
| cell H5 can only be a 4 | |
| cell H1 can only be a 9 | |
| cell H6 can only be a 2 | |
| cell J1 can only be a 7 | |
| cell E1 can only be a 4 | |
| cell G3 can only be a 5 | |
| cell E3 can only be a 7 | |
| cell G7 can only be a 3 | |
| cell G2 can only be a 4 | |
| cell G8 can only be a 1 | |
| cell G4 can only be a 7 | |
| cell D4 can only be a 1 | |
| cell D9 can only be a 8 | |
| cell D2 can only be a 5 | |
| cell D8 can only be a 7 | |
| cell F8 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 7 | |
| cell D4 can only be a 1 | |
| cell E3 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell J1 can only be a 9 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 6 | |
| cell E7 can only be a 4 | |
| cell E2 can only be a 1 | |
| cell E5 can only be a 7 | |
| cell F7 can only be a 6 | |
| cell D9 can only be a 8 | |
| cell D2 can only be a 4 | |
| cell D6 can only be a 6 | |
| no 6s can be placed in row G | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| guessing that cell B8 is a 7 | |
| cell B9 can only be a 2 | |
| cell J9 can only be a 1 | |
| cell G8 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell E3 can only be a 5 | |
| no 5s can be placed in row D | |
| backtracking | |
| cell B8 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 9 | |
| cell C7 is the only cell in row C that can be a 9 | |
| cell C9 is the only cell in row C that can be a 4 | |
| cell E8 is the only cell in row E that can be a 9 | |
| cell J6 is the only cell in row J that can be a 9 | |
| cell H2 is the only cell in row H that can be a 9 | |
| guessing that cell B2 is a 3 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell B5 is the only cell in row B that can be a 5 | |
| cell C5 can only be a 2 | |
| cell B6 can only be a 6 | |
| cell C4 can only be a 3 | |
| cell D6 can only be a 4 | |
| cell G6 can only be a 3 | |
| no 3s can be placed in row H | |
| backtracking | |
| guessing that cell B2 is a 5 | |
| cell C1 can only be a 8 | |
| cell C3 can only be a 3 | |
| cell B4 is the only cell in row B that can be a 8 | |
| cell B6 is the only cell in row B that can be a 3 | |
| cell B5 is the only cell in row B that can be a 6 | |
| cell H4 is the only cell in row H that can be a 3 | |
| cell J7 is the only cell in row J that can be a 3 | |
| cell G2 is the only cell in row G that can be a 3 | |
| cell G6 is the only cell in row G that can be a 4 | |
| cell D6 can only be a 6 | |
| cell H6 can only be a 2 | |
| cell H5 can only be a 5 | |
| cell C5 can only be a 2 | |
| cell C4 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell H8 can only be a 8 | |
| cell H9 can only be a 6 | |
| cell G7 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell G8 can only be a 1 | |
| cell F8 can only be a 7 | |
| cell B8 can only be a 2 | |
| cell B9 can only be a 7 | |
| cell D8 can only be a 5 | |
| cell D1 can only be a 7 | |
| cell D4 can only be a 1 | |
| cell D9 can only be a 8 | |
| cell D2 can only be a 4 | |
| cell E2 can only be a 1 | |
| cell F2 can only be a 8 | |
| cell F3 can only be a 2 | |
| cell E3 can only be a 5 | |
| cell E1 can only be a 6 | |
| cell E7 can only be a 4 | |
| cell E5 can only be a 7 | |
| cell E4 can only be a 2 | |
| cell F5 can only be a 4 | |
| cell F7 can only be a 6 | |
| cell F9 can only be a 1 | |
| cell G4 can only be a 6 | |
| cell J1 can only be a 5 | |
| cell J3 can only be a 8 | |
| cell J4 can only be a 7 | |
| cell J5 can only be a 1 | |
| cell J9 can only be a 2 | |
| done! | |
| solution: | |
| 1 2 6 4 9 7 8 3 5 | |
| 9 5 4 8 6 3 1 2 7 | |
| 8 7 3 5 2 1 9 6 4 | |
| 7 4 9 1 3 6 2 5 8 | |
| 6 1 5 2 7 8 4 9 3 | |
| 3 8 2 9 4 5 6 7 1 | |
| 2 3 7 6 8 4 5 1 9 | |
| 4 9 1 3 5 2 7 8 6 | |
| 5 6 8 7 1 9 3 4 2 |
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| guessing that cell A1 is a 6 | |
| cell C3 is the only cell in the top-left box that can be a 8 | |
| guessing that cell A2 is a 5 | |
| cell J3 is the only cell in column 3 that can be a 5 | |
| guessing that cell A4 is a 1 | |
| cell A8 can only be a 7 | |
| cell A9 can only be a 2 | |
| cell A5 can only be a 8 | |
| cell E9 is the only cell in column 9 that can be a 7 | |
| guessing that cell B1 is a 3 | |
| guessing that cell B3 is a 4 | |
| cell C2 can only be a 7 | |
| cell E3 can only be a 1 | |
| cell B4 is the only cell in row B that can be a 7 | |
| cell B5 is the only cell in row B that can be a 5 | |
| cell F5 is the only cell in row F that can be a 1 | |
| guessing that cell B6 is a 6 | |
| cell B7 can only be a 1 | |
| cell B8 can only be a 9 | |
| guessing that cell C4 is a 2 | |
| cell C5 can only be a 9 | |
| cell C6 can only be a 4 | |
| cell E5 can only be a 6 | |
| cell D5 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell D6 can only be a 9 | |
| cell D1 can only be a 4 | |
| cell E6 can only be a 8 | |
| cell E7 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell D8 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell E4 can only be a 4 | |
| cell F1 can only be a 2 | |
| cell F2 can only be a 3 | |
| cell F4 can only be a 5 | |
| cell F9 can only be a 4 | |
| cell F8 can only be a 8 | |
| cell G3 can only be a 2 | |
| cell G4 can only be a 8 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell C4 is a 4 | |
| guessing that cell C5 is a 2 | |
| cell C6 can only be a 9 | |
| guessing that cell C7 is a 3 | |
| cell C9 can only be a 6 | |
| cell J9 can only be a 3 | |
| guessing that cell D1 is a 2 | |
| cell D3 can only be a 7 | |
| cell D6 can only be a 4 | |
| cell E6 can only be a 8 | |
| cell E4 can only be a 3 | |
| cell D4 can only be a 5 | |
| cell D7 can only be a 6 | |
| cell E7 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 4 | |
| cell D6 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell F1 can only be a 2 | |
| no 2s can be placed in row J | |
| backtracking | |
| guessing that cell D1 is a 7 | |
| cell D3 can only be a 2 | |
| cell D6 can only be a 4 | |
| cell E6 can only be a 8 | |
| cell E4 can only be a 3 | |
| cell D4 can only be a 5 | |
| cell D7 can only be a 6 | |
| cell E7 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 9 | |
| cell D5 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell E5 can only be a 9 | |
| cell F9 can only be a 4 | |
| cell D8 can only be a 3 | |
| cell D4 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell D6 can only be a 4 | |
| cell E6 can only be a 8 | |
| cell E4 can only be a 3 | |
| cell E2 can only be a 4 | |
| cell E7 can only be a 6 | |
| cell F1 can only be a 2 | |
| cell F2 can only be a 3 | |
| cell F4 can only be a 5 | |
| cell F8 can only be a 8 | |
| cell G3 can only be a 2 | |
| cell G4 can only be a 8 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| guessing that cell C7 is a 6 | |
| cell C9 can only be a 3 | |
| cell J9 can only be a 6 | |
| cell J2 can only be a 1 | |
| cell E5 is the only cell in row E that can be a 6 | |
| cell D5 can only be a 9 | |
| cell D8 is the only cell in row D that can be a 6 | |
| cell E2 is the only cell in row E that can be a 9 | |
| cell H2 can only be a 4 | |
| cell F2 can only be a 3 | |
| cell G2 can only be a 6 | |
| cell E6 is the only cell in row E that can be a 4 | |
| cell D6 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell D1 can only be a 4 | |
| cell F1 can only be a 2 | |
| no 2s can be placed in row J | |
| backtracking | |
| cell C7 cannot be filled | |
| backtracking | |
| guessing that cell C5 is a 9 | |
| cell C6 can only be a 2 | |
| cell E5 can only be a 6 | |
| cell D5 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell G3 can only be a 2 | |
| no 2s can be placed in row J | |
| backtracking | |
| cell C5 cannot be filled | |
| backtracking | |
| cell C4 cannot be filled | |
| backtracking | |
| guessing that cell B6 is a 9 | |
| cell C9 is the only cell in row C that can be a 9 | |
| cell C7 is the only cell in row C that can be a 3 | |
| guessing that cell B7 is a 1 | |
| cell B8 can only be a 6 | |
| guessing that cell C4 is a 2 | |
| cell C5 can only be a 6 | |
| cell C6 can only be a 4 | |
| cell E5 can only be a 9 | |
| cell D5 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell D6 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell E6 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell G3 can only be a 2 | |
| cell G4 can only be a 8 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell C4 is a 4 | |
| guessing that cell C5 is a 2 | |
| cell C6 can only be a 6 | |
| guessing that cell D1 is a 2 | |
| cell D3 can only be a 7 | |
| cell D6 can only be a 4 | |
| cell D8 can only be a 3 | |
| cell D4 can only be a 5 | |
| cell D7 can only be a 6 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 6 | |
| cell E6 can only be a 8 | |
| cell E7 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 4 | |
| cell D6 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell D8 can only be a 3 | |
| cell D4 can only be a 5 | |
| cell D7 can only be a 6 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 6 | |
| cell E7 can only be a 8 | |
| cell E4 can only be a 3 | |
| cell E2 can only be a 9 | |
| cell E6 can only be a 4 | |
| cell F1 can only be a 2 | |
| no 2s can be placed in row J | |
| backtracking | |
| guessing that cell D1 is a 7 | |
| cell D3 can only be a 2 | |
| cell D6 can only be a 4 | |
| cell D8 can only be a 3 | |
| cell D4 can only be a 5 | |
| cell D7 can only be a 6 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 6 | |
| cell E6 can only be a 8 | |
| cell E7 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 9 | |
| cell D5 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell E5 can only be a 9 | |
| cell D3 is the only cell in row D that can be a 7 | |
| cell G3 can only be a 2 | |
| cell G4 can only be a 8 | |
| cell E4 can only be a 3 | |
| cell D4 can only be a 2 | |
| cell D6 can only be a 4 | |
| cell D8 can only be a 3 | |
| cell E2 can only be a 4 | |
| cell E6 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| guessing that cell C5 is a 6 | |
| cell C6 can only be a 2 | |
| cell E5 can only be a 9 | |
| cell D5 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell G3 can only be a 2 | |
| no 2s can be placed in row J | |
| backtracking | |
| cell C5 cannot be filled | |
| backtracking | |
| cell C4 cannot be filled | |
| backtracking | |
| guessing that cell B7 is a 6 | |
| cell B8 can only be a 1 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F4 is the only cell in row F that can be a 5 | |
| no 8s can be placed in row F | |
| backtracking | |
| cell B7 cannot be filled | |
| backtracking | |
| cell B6 cannot be filled | |
| backtracking | |
| guessing that cell B3 is a 7 | |
| cell C2 can only be a 4 | |
| cell C4 is the only cell in row C that can be a 7 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell J2 is the only cell in column 2 that can be a 6 | |
| cell J9 can only be a 3 | |
| cell C7 is the only cell in row C that can be a 3 | |
| cell E2 is the only cell in the left box that can be a 9 | |
| cell H2 can only be a 1 | |
| cell F2 can only be a 3 | |
| cell E4 is the only cell in row E that can be a 3 | |
| cell D8 is the only cell in row D that can be a 3 | |
| cell F5 is the only cell in row F that can be a 1 | |
| cell E5 can only be a 6 | |
| cell E7 can only be a 8 | |
| cell E6 can only be a 4 | |
| cell E3 can only be a 1 | |
| cell F8 can only be a 4 | |
| cell F1 can only be a 2 | |
| cell D3 can only be a 4 | |
| cell F9 can only be a 5 | |
| cell D7 can only be a 6 | |
| cell B7 can only be a 1 | |
| cell F4 can only be a 8 | |
| cell G3 can only be a 2 | |
| cell G4 cannot be filled | |
| backtracking | |
| cell B3 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell B3 can only be a 7 | |
| cell B4 can only be a 5 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 9 | |
| cell C5 can only be a 2 | |
| cell C6 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell F1 is the only cell in column 1 that can be a 3 | |
| cell F4 is the only cell in row F that can be a 2 | |
| cell G4 can only be a 8 | |
| cell D3 is the only cell in row D that can be a 2 | |
| cell F8 is the only cell in row F that can be a 8 | |
| cell E7 can only be a 3 | |
| cell B7 can only be a 1 | |
| cell B8 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E4 can only be a 4 | |
| cell D4 can only be a 3 | |
| cell E3 can only be a 1 | |
| cell E2 can only be a 9 | |
| cell E5 can only be a 6 | |
| cell B5 can only be a 9 | |
| cell D5 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 7 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 5 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 9 | |
| cell C5 can only be a 2 | |
| cell C6 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell E3 can only be a 1 | |
| cell F2 can only be a 4 | |
| cell E2 can only be a 9 | |
| cell E5 can only be a 6 | |
| cell B5 can only be a 9 | |
| cell B6 can only be a 6 | |
| cell D5 can only be a 5 | |
| cell D7 can only be a 3 | |
| cell B7 can only be a 1 | |
| cell B8 can only be a 3 | |
| cell D1 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell D4 can only be a 4 | |
| no 4s can be placed in row E | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 2 | |
| cell A9 can only be a 7 | |
| cell A8 can only be a 1 | |
| cell A5 can only be a 8 | |
| cell D8 is the only cell in column 8 that can be a 7 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell B8 can only be a 9 | |
| cell G1 is the only cell in column 1 that can be a 7 | |
| cell E9 is the only cell in the right box that can be a 6 | |
| guessing that cell B3 is a 4 | |
| cell B6 can only be a 1 | |
| cell B5 can only be a 5 | |
| cell B4 can only be a 7 | |
| cell C2 can only be a 7 | |
| cell C4 can only be a 4 | |
| cell D3 can only be a 2 | |
| cell F1 can only be a 4 | |
| no 4s can be placed in the right box | |
| backtracking | |
| guessing that cell B3 is a 7 | |
| cell C2 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell E2 is the only cell in row E that can be a 7 | |
| cell F2 is the only cell in column 2 that can be a 3 | |
| cell J8 is the only cell in column 8 that can be a 3 | |
| cell J9 can only be a 2 | |
| cell C9 can only be a 3 | |
| cell C7 can only be a 2 | |
| cell J1 can only be a 8 | |
| cell J6 can only be a 1 | |
| cell B6 can only be a 4 | |
| cell G4 can only be a 8 | |
| cell G7 can only be a 1 | |
| cell H6 can only be a 2 | |
| cell J2 can only be a 6 | |
| cell G2 can only be a 9 | |
| cell G9 can only be a 4 | |
| cell F9 can only be a 5 | |
| cell D7 can only be a 3 | |
| cell E7 can only be a 8 | |
| no 8s can be placed in row F | |
| backtracking | |
| cell B3 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell B3 can only be a 7 | |
| cell C2 can only be a 3 | |
| cell C4 is the only cell in row C that can be a 7 | |
| cell C6 is the only cell in row C that can be a 4 | |
| cell E2 is the only cell in row E that can be a 7 | |
| cell G1 is the only cell in row G that can be a 7 | |
| cell D1 is the only cell in the left box that can be a 9 | |
| cell F1 is the only cell in column 1 that can be a 3 | |
| cell F5 is the only cell in row F that can be a 2 | |
| cell D6 can only be a 6 | |
| cell D5 can only be a 5 | |
| cell D7 can only be a 3 | |
| cell B7 can only be a 6 | |
| cell C7 can only be a 2 | |
| cell C9 can only be a 9 | |
| cell B8 can only be a 3 | |
| cell C5 can only be a 6 | |
| cell D4 can only be a 4 | |
| cell D3 can only be a 2 | |
| cell E7 can only be a 8 | |
| cell F8 can only be a 4 | |
| cell E9 can only be a 6 | |
| cell F2 can only be a 1 | |
| cell E3 can only be a 4 | |
| cell F4 can only be a 8 | |
| cell F9 can only be a 5 | |
| cell G3 can only be a 1 | |
| cell G4 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 7 | |
| cell B3 can only be a 4 | |
| cell C2 can only be a 3 | |
| cell D3 can only be a 2 | |
| cell C4 is the only cell in row C that can be a 7 | |
| cell C6 is the only cell in row C that can be a 4 | |
| cell F5 is the only cell in row F that can be a 2 | |
| guessing that cell B4 is a 1 | |
| cell G4 can only be a 8 | |
| cell B5 is the only cell in row B that can be a 5 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell E3 can only be a 7 | |
| cell G3 can only be a 1 | |
| cell J2 can only be a 6 | |
| cell F8 is the only cell in row F that can be a 8 | |
| cell J8 can only be a 3 | |
| cell J9 can only be a 2 | |
| cell G7 can only be a 6 | |
| cell B7 can only be a 3 | |
| cell E7 cannot be filled | |
| backtracking | |
| guessing that cell B4 is a 5 | |
| cell F9 is the only cell in row F that can be a 5 | |
| cell D5 is the only cell in row D that can be a 5 | |
| cell H7 is the only cell in row H that can be a 5 | |
| cell G7 is the only cell in column 7 that can be a 1 | |
| cell G3 can only be a 7 | |
| cell E3 can only be a 1 | |
| cell F2 can only be a 4 | |
| cell F1 can only be a 3 | |
| cell D1 can only be a 9 | |
| cell D6 can only be a 6 | |
| cell D7 can only be a 3 | |
| cell B7 can only be a 6 | |
| cell C7 can only be a 2 | |
| cell C9 can only be a 9 | |
| cell B8 can only be a 3 | |
| cell C5 can only be a 6 | |
| cell D4 can only be a 4 | |
| cell E2 can only be a 7 | |
| cell E5 can only be a 9 | |
| cell B5 can only be a 1 | |
| cell B6 can only be a 9 | |
| cell E6 can only be a 8 | |
| cell E7 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 7 | |
| cell A8 can only be a 1 | |
| cell A9 can only be a 2 | |
| cell A5 can only be a 8 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell C7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell F5 is the only cell in row F that can be a 5 | |
| cell B4 is the only cell in row B that can be a 5 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell J2 can only be a 6 | |
| cell J9 can only be a 3 | |
| cell F9 can only be a 4 | |
| cell F1 can only be a 2 | |
| cell F8 can only be a 3 | |
| cell J1 can only be a 8 | |
| cell J8 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell B3 can only be a 7 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell B7 can only be a 3 | |
| cell B8 can only be a 9 | |
| cell C9 can only be a 7 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell E2 is the only cell in row E that can be a 7 | |
| cell D8 is the only cell in row D that can be a 7 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell F5 is the only cell in row F that can be a 5 | |
| cell B4 is the only cell in row B that can be a 5 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell E3 can only be a 4 | |
| cell D3 can only be a 2 | |
| no 2s can be placed in row F | |
| backtracking | |
| guessing that cell B1 is a 7 | |
| cell B3 can only be a 4 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell B7 can only be a 3 | |
| cell B8 can only be a 9 | |
| cell C9 can only be a 7 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell F5 is the only cell in row F that can be a 5 | |
| cell B4 is the only cell in row B that can be a 5 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell E3 can only be a 7 | |
| cell D3 can only be a 2 | |
| no 2s can be placed in row F | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 8 | |
| guessing that cell A5 is a 1 | |
| cell A8 can only be a 7 | |
| cell A9 can only be a 2 | |
| cell E9 is the only cell in column 9 that can be a 7 | |
| guessing that cell B1 is a 3 | |
| guessing that cell B3 is a 4 | |
| cell C2 can only be a 7 | |
| cell E3 can only be a 1 | |
| cell B4 is the only cell in row B that can be a 7 | |
| cell B5 is the only cell in row B that can be a 5 | |
| cell F4 is the only cell in row F that can be a 1 | |
| cell G4 can only be a 2 | |
| cell C4 can only be a 4 | |
| cell E4 can only be a 3 | |
| cell D4 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell D3 can only be a 2 | |
| cell F1 can only be a 4 | |
| cell E2 can only be a 9 | |
| cell D1 can only be a 7 | |
| cell F2 can only be a 3 | |
| cell F8 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell B7 can only be a 1 | |
| cell C7 can only be a 3 | |
| cell D7 cannot be filled | |
| backtracking | |
| guessing that cell B3 is a 7 | |
| cell C2 can only be a 4 | |
| cell C4 is the only cell in row C that can be a 7 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell J2 is the only cell in column 2 that can be a 6 | |
| cell J9 can only be a 3 | |
| cell C7 is the only cell in row C that can be a 3 | |
| cell E2 is the only cell in the left box that can be a 9 | |
| cell H2 can only be a 1 | |
| cell F2 can only be a 3 | |
| cell E4 is the only cell in row E that can be a 3 | |
| cell D8 is the only cell in row D that can be a 3 | |
| cell F4 is the only cell in row F that can be a 1 | |
| cell G4 can only be a 2 | |
| cell G3 can only be a 4 | |
| cell D3 can only be a 2 | |
| cell E3 can only be a 1 | |
| cell F1 can only be a 4 | |
| no 4s can be placed in the right box | |
| backtracking | |
| cell B3 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell B3 can only be a 7 | |
| cell B4 can only be a 5 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 9 | |
| cell C5 can only be a 2 | |
| cell C6 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell F1 is the only cell in column 1 that can be a 3 | |
| cell F4 is the only cell in row F that can be a 2 | |
| cell G4 can only be a 1 | |
| cell D3 is the only cell in row D that can be a 2 | |
| cell G3 can only be a 4 | |
| cell E3 can only be a 1 | |
| no 1s can be placed in row F | |
| backtracking | |
| guessing that cell B1 is a 7 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 5 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 9 | |
| cell C5 can only be a 2 | |
| cell C6 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell E3 can only be a 1 | |
| cell F2 can only be a 4 | |
| cell E2 can only be a 9 | |
| cell H2 can only be a 1 | |
| cell J2 can only be a 6 | |
| cell G2 can only be a 7 | |
| cell G3 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell G4 can only be a 1 | |
| no 1s can be placed in row F | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A5 is a 2 | |
| cell A9 can only be a 7 | |
| cell A8 can only be a 1 | |
| cell D8 is the only cell in column 8 that can be a 7 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell B8 can only be a 9 | |
| cell G1 is the only cell in column 1 that can be a 7 | |
| cell E9 is the only cell in the right box that can be a 6 | |
| guessing that cell B3 is a 4 | |
| cell B6 can only be a 1 | |
| cell B5 can only be a 5 | |
| cell B4 can only be a 7 | |
| cell C2 can only be a 7 | |
| cell C4 can only be a 4 | |
| cell D3 can only be a 2 | |
| cell F1 can only be a 4 | |
| no 4s can be placed in the right box | |
| backtracking | |
| guessing that cell B3 is a 7 | |
| cell C2 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell E2 is the only cell in row E that can be a 7 | |
| cell F2 is the only cell in column 2 that can be a 3 | |
| cell J8 is the only cell in column 8 that can be a 3 | |
| cell J9 can only be a 2 | |
| cell C9 can only be a 3 | |
| cell C7 can only be a 2 | |
| cell J1 can only be a 8 | |
| cell J6 can only be a 1 | |
| cell B6 can only be a 4 | |
| cell G4 can only be a 2 | |
| cell H6 can only be a 8 | |
| cell E6 can only be a 9 | |
| cell C6 can only be a 6 | |
| cell C5 can only be a 9 | |
| cell D6 can only be a 2 | |
| no 2s can be placed in column 3 | |
| backtracking | |
| cell B3 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell B3 can only be a 7 | |
| cell C2 can only be a 3 | |
| cell C4 is the only cell in row C that can be a 7 | |
| cell C6 is the only cell in row C that can be a 4 | |
| cell E2 is the only cell in row E that can be a 7 | |
| cell G1 is the only cell in row G that can be a 7 | |
| cell D1 is the only cell in the left box that can be a 9 | |
| cell F1 is the only cell in column 1 that can be a 3 | |
| cell F4 is the only cell in row F that can be a 2 | |
| cell D6 can only be a 6 | |
| cell D5 can only be a 5 | |
| cell D7 can only be a 3 | |
| cell B7 can only be a 6 | |
| cell C7 can only be a 2 | |
| cell C9 can only be a 9 | |
| cell B8 can only be a 3 | |
| cell C5 can only be a 6 | |
| cell D4 can only be a 4 | |
| cell D3 can only be a 2 | |
| cell E7 can only be a 8 | |
| cell F8 can only be a 4 | |
| cell E9 can only be a 6 | |
| cell F2 can only be a 1 | |
| cell E3 can only be a 4 | |
| cell F5 can only be a 8 | |
| cell F9 can only be a 5 | |
| cell G3 can only be a 1 | |
| cell G4 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 7 | |
| cell B3 can only be a 4 | |
| cell C2 can only be a 3 | |
| cell D3 can only be a 2 | |
| cell C4 is the only cell in row C that can be a 7 | |
| cell C6 is the only cell in row C that can be a 4 | |
| cell F4 is the only cell in row F that can be a 2 | |
| cell G4 can only be a 1 | |
| cell B4 can only be a 5 | |
| cell G3 can only be a 7 | |
| cell E3 can only be a 1 | |
| cell F2 can only be a 4 | |
| cell F1 can only be a 3 | |
| cell D1 can only be a 9 | |
| cell D6 can only be a 6 | |
| cell D5 can only be a 5 | |
| cell D7 can only be a 3 | |
| cell B7 can only be a 6 | |
| cell C7 can only be a 2 | |
| cell C9 can only be a 9 | |
| cell B8 can only be a 3 | |
| cell C5 can only be a 6 | |
| cell D4 can only be a 4 | |
| cell E2 can only be a 7 | |
| cell E4 can only be a 3 | |
| cell E7 can only be a 8 | |
| cell F8 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| cell A5 cannot be filled | |
| backtracking | |
| cell A4 cannot be filled | |
| backtracking | |
| guessing that cell A2 is a 7 | |
| cell A8 can only be a 1 | |
| cell A9 can only be a 2 | |
| cell B3 is the only cell in the top-left box that can be a 5 | |
| guessing that cell A4 is a 5 | |
| cell A5 can only be a 8 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell C2 can only be a 4 | |
| cell C7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F5 is the only cell in row F that can be a 5 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell J1 can only be a 8 | |
| cell G8 is the only cell in row G that can be a 8 | |
| cell H6 is the only cell in row H that can be a 8 | |
| cell H7 is the only cell in row H that can be a 1 | |
| no 2s can be placed in row H | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell B7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F5 is the only cell in row F that can be a 5 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell J1 can only be a 8 | |
| cell H1 can only be a 9 | |
| cell G1 can only be a 7 | |
| cell D1 can only be a 3 | |
| cell G8 is the only cell in row G that can be a 8 | |
| cell H8 can only be a 4 | |
| cell F8 can only be a 3 | |
| cell F9 can only be a 4 | |
| cell H2 can only be a 5 | |
| cell H9 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 8 | |
| cell A5 can only be a 5 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell C2 can only be a 4 | |
| cell C7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F4 is the only cell in row F that can be a 5 | |
| cell F5 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell J1 can only be a 8 | |
| cell G8 is the only cell in row G that can be a 8 | |
| cell H6 is the only cell in row H that can be a 8 | |
| cell H7 is the only cell in row H that can be a 1 | |
| no 2s can be placed in row H | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell B7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F4 is the only cell in row F that can be a 5 | |
| cell F5 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell J1 can only be a 8 | |
| cell H1 can only be a 9 | |
| cell G1 can only be a 7 | |
| cell D1 can only be a 3 | |
| cell G8 is the only cell in row G that can be a 8 | |
| cell H8 can only be a 4 | |
| cell F8 can only be a 3 | |
| cell F9 can only be a 4 | |
| cell H2 can only be a 5 | |
| cell H9 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| cell A4 cannot be filled | |
| backtracking | |
| cell A2 cannot be filled | |
| backtracking | |
| guessing that cell A1 is a 7 | |
| cell C3 is the only cell in the top-left box that can be a 8 | |
| guessing that cell A2 is a 5 | |
| cell B3 can only be a 4 | |
| cell J3 is the only cell in column 3 that can be a 5 | |
| guessing that cell A4 is a 1 | |
| cell A8 can only be a 6 | |
| cell A9 can only be a 2 | |
| cell A5 can only be a 8 | |
| cell C7 can only be a 3 | |
| cell B7 can only be a 1 | |
| cell C2 can only be a 6 | |
| cell B1 can only be a 3 | |
| cell J2 can only be a 1 | |
| cell F5 is the only cell in row F that can be a 1 | |
| cell E3 is the only cell in row E that can be a 1 | |
| cell G8 is the only cell in row G that can be a 1 | |
| cell H6 is the only cell in row H that can be a 1 | |
| guessing that cell B4 is a 5 | |
| cell B8 is the only cell in row B that can be a 7 | |
| cell C9 can only be a 9 | |
| cell C5 can only be a 2 | |
| cell C6 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell D3 is the only cell in row D that can be a 7 | |
| cell G3 can only be a 2 | |
| cell G4 can only be a 8 | |
| cell G7 can only be a 6 | |
| cell D7 can only be a 5 | |
| no 5s can be placed in row F | |
| backtracking | |
| guessing that cell B4 is a 7 | |
| cell B8 can only be a 9 | |
| cell B6 can only be a 6 | |
| cell B5 can only be a 5 | |
| cell C9 can only be a 7 | |
| cell E2 is the only cell in row E that can be a 7 | |
| cell D3 can only be a 2 | |
| cell F1 can only be a 4 | |
| cell D1 can only be a 9 | |
| cell D5 can only be a 6 | |
| cell D6 can only be a 4 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell D8 can only be a 7 | |
| cell E4 can only be a 8 | |
| cell E5 can only be a 9 | |
| cell E6 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 2 | |
| cell A9 can only be a 6 | |
| cell A8 can only be a 1 | |
| cell A5 can only be a 8 | |
| cell B7 can only be a 3 | |
| cell B1 can only be a 6 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 2 | |
| guessing that cell B4 is a 1 | |
| cell B6 can only be a 9 | |
| cell B5 can only be a 5 | |
| cell B8 can only be a 7 | |
| cell C5 can only be a 6 | |
| cell C6 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell C9 can only be a 9 | |
| cell G4 can only be a 8 | |
| cell D3 is the only cell in row D that can be a 7 | |
| cell E3 can only be a 1 | |
| cell E5 can only be a 9 | |
| cell D5 can only be a 2 | |
| cell D6 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell E2 can only be a 4 | |
| cell F2 cannot be filled | |
| backtracking | |
| guessing that cell B4 is a 5 | |
| cell B8 is the only cell in row B that can be a 7 | |
| cell C9 can only be a 9 | |
| cell C5 can only be a 6 | |
| cell C6 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell D3 is the only cell in row D that can be a 7 | |
| cell E3 can only be a 1 | |
| cell E5 can only be a 9 | |
| cell B5 can only be a 1 | |
| cell B6 can only be a 9 | |
| cell E2 can only be a 4 | |
| cell F2 cannot be filled | |
| backtracking | |
| guessing that cell B4 is a 7 | |
| cell B8 can only be a 9 | |
| cell B6 can only be a 1 | |
| cell B5 can only be a 5 | |
| cell C4 can only be a 4 | |
| cell C9 can only be a 7 | |
| cell J2 is the only cell in row J that can be a 1 | |
| cell F2 can only be a 4 | |
| cell H2 can only be a 9 | |
| cell E2 can only be a 7 | |
| cell D3 can only be a 2 | |
| cell E3 can only be a 1 | |
| cell F1 can only be a 3 | |
| cell D1 can only be a 9 | |
| cell D5 can only be a 6 | |
| cell C5 can only be a 9 | |
| cell E5 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 8 | |
| guessing that cell A5 is a 1 | |
| cell A8 can only be a 6 | |
| cell A9 can only be a 2 | |
| cell C7 can only be a 3 | |
| cell B7 can only be a 1 | |
| cell C2 can only be a 6 | |
| cell B1 can only be a 3 | |
| cell J2 can only be a 1 | |
| cell F4 is the only cell in row F that can be a 1 | |
| cell G4 can only be a 2 | |
| cell G3 can only be a 7 | |
| cell D3 can only be a 2 | |
| cell E3 can only be a 1 | |
| cell F1 can only be a 4 | |
| cell D1 can only be a 9 | |
| cell F2 can only be a 3 | |
| cell E2 can only be a 7 | |
| cell F8 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell F9 cannot be filled | |
| backtracking | |
| guessing that cell A5 is a 2 | |
| cell A9 can only be a 6 | |
| cell A8 can only be a 1 | |
| cell B7 can only be a 3 | |
| cell B1 can only be a 6 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 2 | |
| guessing that cell B4 is a 1 | |
| cell B6 can only be a 9 | |
| cell B5 can only be a 5 | |
| cell B8 can only be a 7 | |
| cell C5 can only be a 6 | |
| cell C6 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell C9 can only be a 9 | |
| cell D5 can only be a 9 | |
| cell G4 can only be a 2 | |
| cell G9 can only be a 4 | |
| cell D3 is the only cell in row D that can be a 7 | |
| no 2s can be placed in column 3 | |
| backtracking | |
| guessing that cell B4 is a 5 | |
| cell B8 is the only cell in row B that can be a 7 | |
| cell C9 can only be a 9 | |
| cell C5 can only be a 6 | |
| cell C6 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell D3 is the only cell in row D that can be a 7 | |
| cell E3 can only be a 1 | |
| cell F2 can only be a 4 | |
| cell E2 can only be a 9 | |
| cell E5 can only be a 8 | |
| cell E6 can only be a 6 | |
| cell E7 cannot be filled | |
| backtracking | |
| guessing that cell B4 is a 7 | |
| cell B8 can only be a 9 | |
| cell B6 can only be a 1 | |
| cell B5 can only be a 5 | |
| cell C4 can only be a 4 | |
| cell C9 can only be a 7 | |
| cell J2 is the only cell in row J that can be a 1 | |
| cell F2 can only be a 4 | |
| cell H2 can only be a 9 | |
| cell E2 can only be a 7 | |
| cell D3 can only be a 2 | |
| cell E3 can only be a 1 | |
| cell E4 can only be a 3 | |
| cell D4 can only be a 5 | |
| cell D7 can only be a 6 | |
| cell D5 can only be a 9 | |
| no 9s can be placed in row E | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| guessing that cell A5 is a 6 | |
| cell A8 can only be a 1 | |
| cell A9 can only be a 2 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell C2 can only be a 6 | |
| cell C7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell J2 can only be a 1 | |
| cell F5 is the only cell in row F that can be a 8 | |
| cell F4 is the only cell in row F that can be a 1 | |
| no 5s can be placed in row F | |
| backtracking | |
| guessing that cell B1 is a 6 | |
| cell B7 can only be a 3 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F5 is the only cell in row F that can be a 8 | |
| cell F4 is the only cell in row F that can be a 5 | |
| cell B5 is the only cell in row B that can be a 5 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell E3 can only be a 7 | |
| cell D3 can only be a 2 | |
| no 2s can be placed in row F | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| cell A5 cannot be filled | |
| backtracking | |
| cell A4 cannot be filled | |
| backtracking | |
| guessing that cell A2 is a 6 | |
| cell A8 can only be a 1 | |
| cell A9 can only be a 2 | |
| cell B3 is the only cell in the top-left box that can be a 5 | |
| guessing that cell A4 is a 5 | |
| cell A5 can only be a 8 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell C2 can only be a 4 | |
| cell C7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F5 is the only cell in row F that can be a 5 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell J2 can only be a 5 | |
| cell H2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell E2 can only be a 3 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell H9 is the only cell in row H that can be a 5 | |
| cell D1 is the only cell in column 1 that can be a 9 | |
| cell D4 is the only cell in column 4 that can be a 3 | |
| guessing that cell B4 is a 1 | |
| cell B5 can only be a 9 | |
| cell B6 can only be a 4 | |
| cell B8 can only be a 7 | |
| cell C9 can only be a 9 | |
| cell E4 can only be a 4 | |
| cell E3 can only be a 7 | |
| no 7s can be placed in row D | |
| backtracking | |
| guessing that cell B4 is a 4 | |
| cell E4 can only be a 1 | |
| cell G4 can only be a 2 | |
| cell C4 can only be a 7 | |
| cell C9 can only be a 9 | |
| cell B8 can only be a 7 | |
| cell G7 can only be a 1 | |
| cell G3 can only be a 4 | |
| no 4s can be placed in column 1 | |
| backtracking | |
| guessing that cell B4 is a 7 | |
| cell B8 can only be a 9 | |
| cell B5 can only be a 1 | |
| cell B6 can only be a 4 | |
| cell C4 can only be a 2 | |
| cell C9 can only be a 7 | |
| cell G4 can only be a 1 | |
| cell E4 can only be a 4 | |
| cell E3 can only be a 7 | |
| cell D3 can only be a 4 | |
| cell E9 can only be a 6 | |
| cell D8 can only be a 7 | |
| cell E5 can only be a 9 | |
| cell C5 can only be a 6 | |
| cell C6 can only be a 9 | |
| cell D5 can only be a 2 | |
| cell D6 can only be a 6 | |
| cell E6 can only be a 1 | |
| cell G3 can only be a 2 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell B7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F5 is the only cell in row F that can be a 5 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell J2 can only be a 5 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell H9 is the only cell in row H that can be a 5 | |
| cell D1 is the only cell in column 1 that can be a 3 | |
| cell E4 is the only cell in column 4 that can be a 3 | |
| cell E2 is the only cell in the left box that can be a 9 | |
| cell H2 can only be a 4 | |
| cell G2 can only be a 7 | |
| guessing that cell B4 is a 1 | |
| cell G4 can only be a 2 | |
| cell D4 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell C9 can only be a 9 | |
| cell B8 can only be a 7 | |
| cell C5 can only be a 2 | |
| cell C6 can only be a 4 | |
| cell D3 can only be a 7 | |
| cell D8 can only be a 6 | |
| cell D5 can only be a 9 | |
| cell B5 can only be a 6 | |
| cell B6 can only be a 9 | |
| cell D6 can only be a 2 | |
| cell E3 can only be a 4 | |
| cell E5 can only be a 1 | |
| cell E6 can only be a 6 | |
| cell E9 can only be a 7 | |
| cell G3 can only be a 1 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell B4 is a 7 | |
| cell B8 can only be a 9 | |
| cell C9 can only be a 7 | |
| cell H8 can only be a 8 | |
| cell H1 can only be a 9 | |
| cell E3 is the only cell in row E that can be a 7 | |
| cell D3 can only be a 4 | |
| cell D4 can only be a 2 | |
| cell C4 can only be a 4 | |
| cell G4 can only be a 1 | |
| cell G3 can only be a 2 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 8 | |
| cell A5 can only be a 5 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell C2 can only be a 4 | |
| cell C7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F4 is the only cell in row F that can be a 5 | |
| cell F5 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell J2 can only be a 5 | |
| cell H2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell E2 can only be a 3 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell H9 is the only cell in row H that can be a 5 | |
| cell D1 is the only cell in column 1 that can be a 9 | |
| cell D4 is the only cell in column 4 that can be a 3 | |
| guessing that cell B4 is a 1 | |
| cell B5 can only be a 9 | |
| cell B6 can only be a 4 | |
| cell B8 can only be a 7 | |
| cell C9 can only be a 9 | |
| cell E4 can only be a 4 | |
| cell E3 can only be a 7 | |
| no 7s can be placed in row D | |
| backtracking | |
| guessing that cell B4 is a 4 | |
| cell E4 can only be a 1 | |
| cell G4 can only be a 2 | |
| cell C4 can only be a 7 | |
| cell C9 can only be a 9 | |
| cell B8 can only be a 7 | |
| cell G7 can only be a 1 | |
| cell G3 can only be a 4 | |
| no 4s can be placed in column 1 | |
| backtracking | |
| guessing that cell B4 is a 7 | |
| cell B8 can only be a 9 | |
| cell B5 can only be a 1 | |
| cell B6 can only be a 4 | |
| cell C4 can only be a 2 | |
| cell C9 can only be a 7 | |
| cell G4 can only be a 1 | |
| cell E4 can only be a 4 | |
| cell E3 can only be a 7 | |
| cell D3 can only be a 4 | |
| cell E9 can only be a 6 | |
| cell D8 can only be a 7 | |
| cell E5 can only be a 9 | |
| cell C5 can only be a 6 | |
| cell C6 can only be a 9 | |
| cell D5 can only be a 2 | |
| cell D6 can only be a 6 | |
| cell E6 can only be a 1 | |
| cell G3 can only be a 2 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell B7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F4 is the only cell in row F that can be a 5 | |
| cell F5 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell J2 can only be a 5 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell H9 is the only cell in row H that can be a 5 | |
| cell D1 is the only cell in column 1 that can be a 3 | |
| cell E4 is the only cell in column 4 that can be a 3 | |
| cell E2 is the only cell in the left box that can be a 9 | |
| cell H2 can only be a 4 | |
| cell G2 can only be a 7 | |
| guessing that cell B4 is a 1 | |
| cell G4 can only be a 2 | |
| cell D4 can only be a 4 | |
| cell C4 can only be a 7 | |
| cell C9 can only be a 9 | |
| cell B8 can only be a 7 | |
| cell C5 can only be a 2 | |
| cell C6 can only be a 4 | |
| cell D3 can only be a 7 | |
| cell D8 can only be a 6 | |
| cell D5 can only be a 9 | |
| cell B5 can only be a 6 | |
| cell B6 can only be a 9 | |
| cell D6 can only be a 2 | |
| cell E3 can only be a 4 | |
| cell E5 can only be a 1 | |
| cell E6 can only be a 6 | |
| cell E9 can only be a 7 | |
| cell G3 can only be a 1 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell B4 is a 7 | |
| cell B8 can only be a 9 | |
| cell C9 can only be a 7 | |
| cell H8 can only be a 8 | |
| cell H1 can only be a 9 | |
| cell E3 is the only cell in row E that can be a 7 | |
| cell D3 can only be a 4 | |
| cell D4 can only be a 2 | |
| cell C4 can only be a 4 | |
| cell G4 can only be a 1 | |
| cell G3 can only be a 2 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| cell A4 cannot be filled | |
| backtracking | |
| cell A2 cannot be filled | |
| backtracking | |
| guessing that cell A1 is a 8 | |
| guessing that cell A2 is a 5 | |
| cell J3 is the only cell in column 3 that can be a 5 | |
| cell G3 is the only cell in column 3 that can be a 8 | |
| cell E3 is the only cell in column 3 that can be a 1 | |
| cell D3 is the only cell in column 3 that can be a 2 | |
| guessing that cell A4 is a 1 | |
| cell G4 can only be a 2 | |
| cell F5 is the only cell in row F that can be a 1 | |
| no 2s can be placed in row F | |
| backtracking | |
| guessing that cell A4 is a 2 | |
| cell G4 can only be a 1 | |
| cell F5 is the only cell in row F that can be a 1 | |
| no 2s can be placed in row F | |
| backtracking | |
| guessing that cell A4 is a 7 | |
| guessing that cell A5 is a 1 | |
| cell A8 can only be a 6 | |
| cell A9 can only be a 2 | |
| cell C7 can only be a 3 | |
| cell B7 can only be a 1 | |
| cell B1 is the only cell in row B that can be a 3 | |
| cell F1 can only be a 4 | |
| cell F2 can only be a 3 | |
| cell F8 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell F9 cannot be filled | |
| backtracking | |
| guessing that cell A5 is a 2 | |
| cell A9 can only be a 6 | |
| cell A8 can only be a 1 | |
| cell B7 can only be a 3 | |
| cell C7 can only be a 2 | |
| cell C2 is the only cell in row C that can be a 3 | |
| cell F2 can only be a 4 | |
| cell F1 can only be a 3 | |
| cell F8 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell F9 cannot be filled | |
| backtracking | |
| guessing that cell A5 is a 6 | |
| cell A8 can only be a 1 | |
| cell A9 can only be a 2 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell C7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 8 | |
| cell E7 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| no 4s can be placed in column 3 | |
| backtracking | |
| guessing that cell B1 is a 6 | |
| cell B7 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 8 | |
| cell E7 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 7 | |
| no 7s can be placed in column 3 | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| cell A5 cannot be filled | |
| backtracking | |
| cell A4 cannot be filled | |
| backtracking | |
| guessing that cell A2 is a 6 | |
| cell B3 is the only cell in the top-left box that can be a 5 | |
| guessing that cell A4 is a 1 | |
| cell A8 can only be a 7 | |
| cell A9 can only be a 2 | |
| cell A5 can only be a 5 | |
| cell E9 is the only cell in column 9 that can be a 7 | |
| guessing that cell B1 is a 3 | |
| cell B4 is the only cell in row B that can be a 7 | |
| cell B6 is the only cell in row B that can be a 4 | |
| guessing that cell B5 is a 6 | |
| cell B7 can only be a 1 | |
| cell B8 can only be a 9 | |
| guessing that cell C2 is a 4 | |
| cell C3 can only be a 7 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell E2 is the only cell in the left box that can be a 9 | |
| cell F2 is the only cell in column 2 that can be a 3 | |
| cell F5 is the only cell in row F that can be a 1 | |
| cell E5 can only be a 8 | |
| cell E6 can only be a 6 | |
| cell E7 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E4 can only be a 4 | |
| cell E3 can only be a 1 | |
| cell F9 can only be a 4 | |
| cell D8 can only be a 6 | |
| cell F1 can only be a 2 | |
| cell D3 can only be a 4 | |
| cell F4 can only be a 5 | |
| cell F8 can only be a 8 | |
| cell J1 can only be a 6 | |
| cell J9 can only be a 5 | |
| cell H9 can only be a 9 | |
| cell G9 can only be a 6 | |
| cell H1 can only be a 4 | |
| cell G1 can only be a 9 | |
| cell H8 can only be a 1 | |
| no 1s can be placed in row G | |
| backtracking | |
| guessing that cell C2 is a 7 | |
| cell C3 can only be a 4 | |
| cell E3 can only be a 1 | |
| cell F5 is the only cell in row F that can be a 1 | |
| guessing that cell C4 is a 2 | |
| cell G4 can only be a 8 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell D3 can only be a 7 | |
| cell G3 can only be a 2 | |
| cell G7 can only be a 6 | |
| cell C7 can only be a 3 | |
| cell C9 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| no 8s can be placed in row F | |
| backtracking | |
| guessing that cell C4 is a 8 | |
| cell G4 can only be a 2 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell D3 can only be a 7 | |
| cell G3 can only be a 8 | |
| cell G7 can only be a 6 | |
| cell C7 can only be a 3 | |
| cell C9 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| no 8s can be placed in row F | |
| backtracking | |
| cell C4 cannot be filled | |
| backtracking | |
| cell C2 cannot be filled | |
| backtracking | |
| guessing that cell B5 is a 9 | |
| cell C9 is the only cell in row C that can be a 9 | |
| cell C7 is the only cell in row C that can be a 3 | |
| guessing that cell B7 is a 1 | |
| cell B8 can only be a 6 | |
| guessing that cell C2 is a 4 | |
| cell C3 can only be a 7 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell D6 is the only cell in row D that can be a 9 | |
| cell E2 is the only cell in row E that can be a 9 | |
| cell E4 is the only cell in row E that can be a 3 | |
| cell D8 is the only cell in row D that can be a 3 | |
| cell E3 is the only cell in row E that can be a 4 | |
| cell D3 can only be a 2 | |
| cell F1 cannot be filled | |
| backtracking | |
| guessing that cell C2 is a 7 | |
| cell C3 can only be a 4 | |
| cell E3 can only be a 1 | |
| cell F5 is the only cell in row F that can be a 1 | |
| guessing that cell C4 is a 2 | |
| cell G4 can only be a 8 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell D3 can only be a 7 | |
| cell G3 can only be a 2 | |
| cell G7 can only be a 6 | |
| no 6s can be placed in column 9 | |
| backtracking | |
| guessing that cell C4 is a 8 | |
| cell G4 can only be a 2 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell D3 can only be a 7 | |
| cell G3 can only be a 8 | |
| cell G7 can only be a 6 | |
| no 6s can be placed in column 9 | |
| backtracking | |
| cell C4 cannot be filled | |
| backtracking | |
| cell C2 cannot be filled | |
| backtracking | |
| guessing that cell B7 is a 6 | |
| cell B8 can only be a 1 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell F4 is the only cell in row F that can be a 5 | |
| cell F5 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell E3 can only be a 4 | |
| cell C3 can only be a 7 | |
| cell C2 can only be a 4 | |
| cell D3 can only be a 2 | |
| cell F1 cannot be filled | |
| backtracking | |
| cell B7 cannot be filled | |
| backtracking | |
| cell B5 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell B4 can only be a 7 | |
| cell C3 can only be a 7 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 9 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell F1 is the only cell in column 1 that can be a 3 | |
| cell J9 is the only cell in column 9 that can be a 3 | |
| cell J2 is the only cell in row J that can be a 5 | |
| cell G9 is the only cell in column 9 that can be a 6 | |
| cell J1 is the only cell in row J that can be a 6 | |
| cell D8 is the only cell in column 8 that can be a 6 | |
| cell B8 is the only cell in column 8 that can be a 3 | |
| cell B7 can only be a 1 | |
| cell D3 is the only cell in the left box that can be a 2 | |
| cell D5 can only be a 9 | |
| cell B5 can only be a 6 | |
| cell B6 can only be a 9 | |
| cell D6 can only be a 4 | |
| cell C4 is the only cell in row C that can be a 4 | |
| cell E6 is the only cell in row E that can be a 6 | |
| cell E2 is the only cell in row E that can be a 9 | |
| cell E3 is the only cell in row E that can be a 4 | |
| cell F2 can only be a 1 | |
| cell H2 can only be a 4 | |
| cell H9 can only be a 5 | |
| cell F9 can only be a 4 | |
| cell F8 can only be a 8 | |
| cell E7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell E4 can only be a 8 | |
| cell E5 can only be a 1 | |
| cell F5 can only be a 2 | |
| cell C5 can only be a 8 | |
| cell C6 can only be a 2 | |
| no 2s can be placed in row J | |
| backtracking | |
| guessing that cell B1 is a 7 | |
| cell B4 can only be a 4 | |
| cell C3 can only be a 4 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 9 | |
| cell E3 can only be a 1 | |
| cell F2 can only be a 4 | |
| cell E2 can only be a 9 | |
| cell C4 is the only cell in row C that can be a 7 | |
| cell D3 is the only cell in row D that can be a 7 | |
| cell E6 is the only cell in row E that can be a 4 | |
| cell D8 is the only cell in row D that can be a 4 | |
| no 6s can be placed in the right box | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 2 | |
| cell A9 can only be a 7 | |
| cell A8 can only be a 1 | |
| cell A5 can only be a 5 | |
| cell D8 is the only cell in column 8 that can be a 7 | |
| guessing that cell B1 is a 3 | |
| cell B7 can only be a 6 | |
| cell B8 can only be a 9 | |
| cell B5 can only be a 1 | |
| cell B6 can only be a 4 | |
| cell B4 can only be a 7 | |
| cell C4 can only be a 8 | |
| cell G4 can only be a 1 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell J2 can only be a 5 | |
| cell E6 is the only cell in row E that can be a 1 | |
| cell H7 is the only cell in row H that can be a 1 | |
| cell H9 is the only cell in row H that can be a 5 | |
| cell F4 is the only cell in row F that can be a 5 | |
| cell D7 is the only cell in row D that can be a 5 | |
| cell D4 is the only cell in row D that can be a 3 | |
| cell E4 can only be a 4 | |
| cell E3 can only be a 7 | |
| cell C3 can only be a 4 | |
| cell C2 can only be a 7 | |
| cell D3 can only be a 2 | |
| cell F1 can only be a 4 | |
| no 4s can be placed in row D | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell C3 can only be a 7 | |
| cell C2 can only be a 3 | |
| cell B4 is the only cell in row B that can be a 7 | |
| cell E2 is the only cell in row E that can be a 7 | |
| cell G1 is the only cell in row G that can be a 7 | |
| cell J1 is the only cell in column 1 that can be a 6 | |
| cell D1 is the only cell in the left box that can be a 9 | |
| cell H1 can only be a 2 | |
| cell F1 can only be a 3 | |
| cell F5 is the only cell in row F that can be a 2 | |
| cell D5 can only be a 6 | |
| cell D6 can only be a 4 | |
| cell D3 can only be a 2 | |
| cell C4 is the only cell in row C that can be a 4 | |
| cell J6 is the only cell in column 6 that can be a 2 | |
| guessing that cell B5 is a 1 | |
| guessing that cell B6 is a 6 | |
| cell B7 can only be a 3 | |
| cell B8 can only be a 9 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell F9 can only be a 4 | |
| cell F2 can only be a 1 | |
| cell E3 can only be a 4 | |
| cell F8 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell C7 can only be a 2 | |
| cell C9 can only be a 6 | |
| cell E9 can only be a 3 | |
| cell F4 can only be a 5 | |
| cell H8 can only be a 4 | |
| cell G8 can only be a 6 | |
| cell J2 can only be a 5 | |
| cell J9 cannot be filled | |
| backtracking | |
| guessing that cell B6 is a 9 | |
| cell C5 can only be a 8 | |
| cell C6 can only be a 6 | |
| cell C7 can only be a 2 | |
| cell C9 can only be a 9 | |
| cell E5 can only be a 9 | |
| cell G9 is the only cell in row G that can be a 2 | |
| cell E9 is the only cell in column 9 that can be a 6 | |
| cell E3 is the only cell in row E that can be a 4 | |
| cell F2 can only be a 1 | |
| cell J2 can only be a 5 | |
| cell J9 can only be a 3 | |
| cell J8 can only be a 8 | |
| cell F8 can only be a 4 | |
| cell F9 can only be a 5 | |
| cell D7 can only be a 3 | |
| cell B7 can only be a 6 | |
| cell B8 can only be a 3 | |
| cell D4 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell E6 can only be a 1 | |
| cell E4 can only be a 3 | |
| cell F4 can only be a 8 | |
| cell G4 can only be a 1 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell B6 cannot be filled | |
| backtracking | |
| guessing that cell B5 is a 9 | |
| cell C5 can only be a 8 | |
| cell C6 can only be a 6 | |
| cell B6 can only be a 1 | |
| cell C7 can only be a 2 | |
| cell C9 can only be a 9 | |
| cell E5 can only be a 1 | |
| cell E3 can only be a 4 | |
| cell F2 can only be a 1 | |
| cell H6 can only be a 8 | |
| cell E6 can only be a 9 | |
| cell G4 can only be a 1 | |
| cell G3 can only be a 8 | |
| cell G7 can only be a 6 | |
| cell B7 can only be a 3 | |
| cell B8 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell E4 can only be a 8 | |
| cell E7 cannot be filled | |
| backtracking | |
| cell B5 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 7 | |
| cell C3 can only be a 4 | |
| cell C2 can only be a 3 | |
| cell D3 can only be a 2 | |
| cell C4 is the only cell in row C that can be a 7 | |
| cell F5 is the only cell in row F that can be a 2 | |
| guessing that cell B4 is a 1 | |
| cell G4 can only be a 8 | |
| cell B6 is the only cell in row B that can be a 4 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell E3 can only be a 7 | |
| cell G3 can only be a 1 | |
| cell J2 can only be a 5 | |
| cell J3 can only be a 8 | |
| cell F8 is the only cell in row F that can be a 8 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell H7 is the only cell in row H that can be a 8 | |
| no 1s can be placed in column 7 | |
| backtracking | |
| guessing that cell B4 is a 4 | |
| guessing that cell B5 is a 1 | |
| guessing that cell B6 is a 6 | |
| cell B7 can only be a 3 | |
| cell B8 can only be a 9 | |
| guessing that cell C5 is a 8 | |
| cell C6 can only be a 9 | |
| cell D6 can only be a 4 | |
| guessing that cell C7 is a 2 | |
| cell C9 can only be a 6 | |
| guessing that cell D1 is a 3 | |
| cell D4 can only be a 5 | |
| cell D7 can only be a 6 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 6 | |
| cell E7 can only be a 8 | |
| cell E6 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell E4 can only be a 3 | |
| cell E9 can only be a 4 | |
| cell E2 can only be a 9 | |
| cell F1 can only be a 4 | |
| cell F2 can only be a 1 | |
| cell F4 can only be a 8 | |
| cell F8 can only be a 3 | |
| cell F9 can only be a 5 | |
| cell G4 can only be a 1 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 9 | |
| cell D5 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell E5 can only be a 9 | |
| cell E9 is the only cell in row E that can be a 3 | |
| cell F9 can only be a 4 | |
| cell F1 can only be a 3 | |
| cell F2 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell E2 can only be a 4 | |
| cell F8 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell F4 can only be a 5 | |
| cell H8 can only be a 4 | |
| cell G8 can only be a 6 | |
| cell H1 can only be a 2 | |
| cell G1 can only be a 4 | |
| cell J1 can only be a 6 | |
| cell J2 can only be a 5 | |
| cell H2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell H9 can only be a 5 | |
| cell J8 can only be a 3 | |
| cell J9 can only be a 2 | |
| no 2s can be placed in row G | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| guessing that cell C7 is a 6 | |
| cell C9 can only be a 2 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell D1 can only be a 9 | |
| cell D5 can only be a 6 | |
| cell E5 can only be a 9 | |
| cell E7 can only be a 8 | |
| cell E4 can only be a 1 | |
| cell E6 cannot be filled | |
| backtracking | |
| cell C7 cannot be filled | |
| backtracking | |
| guessing that cell C5 is a 9 | |
| cell C6 can only be a 8 | |
| cell D5 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell E5 can only be a 8 | |
| cell E4 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell E7 can only be a 6 | |
| cell C7 can only be a 2 | |
| cell C9 can only be a 6 | |
| cell F4 can only be a 5 | |
| cell G4 can only be a 8 | |
| cell G3 can only be a 1 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell C5 cannot be filled | |
| backtracking | |
| guessing that cell B6 is a 9 | |
| cell C9 is the only cell in row C that can be a 9 | |
| cell C7 is the only cell in row C that can be a 2 | |
| guessing that cell B7 is a 3 | |
| cell B8 can only be a 6 | |
| guessing that cell C5 is a 6 | |
| cell C6 can only be a 8 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell D1 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell E4 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell E2 can only be a 9 | |
| cell E6 can only be a 4 | |
| cell E9 can only be a 3 | |
| cell F1 can only be a 3 | |
| cell F2 can only be a 1 | |
| cell F4 can only be a 5 | |
| cell F9 can only be a 4 | |
| cell F8 can only be a 8 | |
| cell G4 can only be a 8 | |
| cell G3 can only be a 1 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell C5 is a 8 | |
| cell C6 can only be a 6 | |
| cell D6 can only be a 4 | |
| guessing that cell D1 is a 3 | |
| cell D4 can only be a 5 | |
| cell D7 can only be a 6 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 6 | |
| cell E7 can only be a 8 | |
| cell E6 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell E4 can only be a 3 | |
| cell E9 can only be a 4 | |
| cell E2 can only be a 9 | |
| cell F1 can only be a 4 | |
| cell F2 can only be a 1 | |
| cell F4 can only be a 8 | |
| cell F8 can only be a 3 | |
| cell F9 can only be a 5 | |
| cell G4 can only be a 1 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell D1 is a 9 | |
| cell D5 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell E5 can only be a 9 | |
| cell E9 is the only cell in row E that can be a 3 | |
| cell F9 can only be a 4 | |
| cell F1 can only be a 3 | |
| cell F2 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell E2 can only be a 4 | |
| cell F8 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell F4 can only be a 5 | |
| cell J2 can only be a 5 | |
| cell H2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell H8 can only be a 4 | |
| cell G8 can only be a 9 | |
| cell H1 can only be a 2 | |
| cell H9 can only be a 5 | |
| cell J1 can only be a 6 | |
| cell G1 can only be a 4 | |
| cell J8 can only be a 3 | |
| cell J9 can only be a 2 | |
| no 2s can be placed in row G | |
| backtracking | |
| cell D1 cannot be filled | |
| backtracking | |
| cell C5 cannot be filled | |
| backtracking | |
| guessing that cell B7 is a 6 | |
| cell B8 can only be a 3 | |
| cell J9 is the only cell in row J that can be a 3 | |
| cell J2 is the only cell in row J that can be a 5 | |
| cell E9 is the only cell in the right box that can be a 6 | |
| guessing that cell C5 is a 6 | |
| cell C6 can only be a 8 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 8 | |
| cell E7 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell D4 can only be a 3 | |
| cell D1 can only be a 4 | |
| cell D6 can only be a 6 | |
| cell E4 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell E2 can only be a 9 | |
| cell E6 can only be a 4 | |
| cell F1 can only be a 3 | |
| cell F2 can only be a 1 | |
| cell F4 can only be a 5 | |
| cell F9 can only be a 4 | |
| cell F8 can only be a 8 | |
| cell G4 can only be a 8 | |
| cell G3 can only be a 1 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell C5 is a 8 | |
| cell C6 can only be a 6 | |
| cell D6 can only be a 4 | |
| cell E5 can only be a 9 | |
| cell D5 can only be a 6 | |
| cell D1 is the only cell in row D that can be a 9 | |
| cell E2 is the only cell in row E that can be a 4 | |
| cell F1 can only be a 3 | |
| cell F2 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell H2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell G8 is the only cell in row G that can be a 9 | |
| cell G1 is the only cell in row G that can be a 6 | |
| cell J1 can only be a 2 | |
| cell H1 can only be a 4 | |
| cell H8 can only be a 8 | |
| cell F8 can only be a 4 | |
| cell F9 can only be a 5 | |
| cell D7 can only be a 3 | |
| cell D4 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell E6 can only be a 1 | |
| cell E4 can only be a 3 | |
| cell F4 can only be a 8 | |
| cell G4 can only be a 1 | |
| cell G7 cannot be filled | |
| backtracking | |
| cell C5 cannot be filled | |
| backtracking | |
| cell B7 cannot be filled | |
| backtracking | |
| cell B6 cannot be filled | |
| backtracking | |
| guessing that cell B5 is a 6 | |
| cell B7 can only be a 3 | |
| cell B8 can only be a 9 | |
| cell B6 can only be a 1 | |
| cell D5 can only be a 9 | |
| cell C5 can only be a 8 | |
| cell C6 can only be a 9 | |
| cell E5 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell E2 is the only cell in row E that can be a 9 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell J2 can only be a 5 | |
| cell H2 can only be a 4 | |
| cell G2 can only be a 7 | |
| cell H8 can only be a 8 | |
| cell H6 can only be a 2 | |
| cell H1 can only be a 9 | |
| cell H9 can only be a 5 | |
| cell H7 can only be a 1 | |
| cell J6 can only be a 8 | |
| cell G4 can only be a 1 | |
| cell G3 can only be a 8 | |
| cell J3 can only be a 1 | |
| cell F4 is the only cell in row F that can be a 5 | |
| no 8s can be placed in row F | |
| backtracking | |
| guessing that cell B5 is a 9 | |
| cell D5 can only be a 6 | |
| cell C5 can only be a 8 | |
| cell C6 can only be a 6 | |
| cell B6 can only be a 1 | |
| cell C7 can only be a 2 | |
| cell C9 can only be a 9 | |
| cell E5 can only be a 1 | |
| cell E3 can only be a 7 | |
| cell F2 is the only cell in row F that can be a 1 | |
| cell J2 can only be a 5 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell H7 is the only cell in row H that can be a 1 | |
| cell H9 is the only cell in row H that can be a 5 | |
| cell F4 is the only cell in row F that can be a 5 | |
| cell D4 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E4 can only be a 8 | |
| cell G4 can only be a 1 | |
| cell G3 can only be a 8 | |
| no 8s can be placed in column 7 | |
| backtracking | |
| cell B5 cannot be filled | |
| backtracking | |
| cell B4 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 5 | |
| guessing that cell A5 is a 1 | |
| cell A8 can only be a 7 | |
| cell A9 can only be a 2 | |
| cell E9 is the only cell in column 9 that can be a 7 | |
| guessing that cell B1 is a 3 | |
| cell B4 is the only cell in row B that can be a 7 | |
| cell B6 is the only cell in row B that can be a 4 | |
| guessing that cell B5 is a 6 | |
| cell B7 can only be a 1 | |
| cell B8 can only be a 9 | |
| guessing that cell C2 is a 4 | |
| cell C3 can only be a 7 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell E2 is the only cell in the left box that can be a 9 | |
| cell E5 can only be a 8 | |
| cell F8 is the only cell in row F that can be a 8 | |
| cell F2 is the only cell in column 2 that can be a 3 | |
| cell F4 is the only cell in row F that can be a 1 | |
| cell E6 can only be a 6 | |
| cell E7 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell E4 can only be a 4 | |
| cell E3 can only be a 1 | |
| cell F9 can only be a 4 | |
| cell D8 can only be a 6 | |
| cell F1 can only be a 2 | |
| cell D3 can only be a 4 | |
| cell F5 can only be a 5 | |
| cell J1 can only be a 6 | |
| cell J9 can only be a 5 | |
| cell H9 can only be a 9 | |
| cell G9 can only be a 6 | |
| cell H1 can only be a 4 | |
| cell G1 can only be a 9 | |
| cell H8 can only be a 1 | |
| no 1s can be placed in row G | |
| backtracking | |
| guessing that cell C2 is a 7 | |
| cell C3 can only be a 4 | |
| cell E3 can only be a 1 | |
| cell F4 is the only cell in row F that can be a 1 | |
| guessing that cell C4 is a 2 | |
| cell G4 can only be a 8 | |
| cell J3 is the only cell in column 3 that can be a 8 | |
| guessing that cell C5 is a 8 | |
| cell C6 can only be a 9 | |
| cell E5 can only be a 9 | |
| cell D1 is the only cell in row D that can be a 9 | |
| cell D3 is the only cell in row D that can be a 7 | |
| cell G3 can only be a 2 | |
| cell G7 can only be a 6 | |
| cell C7 can only be a 3 | |
| cell C9 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell D5 can only be a 2 | |
| cell D6 can only be a 6 | |
| no 6s can be placed in row E | |
| backtracking | |
| guessing that cell C5 is a 9 | |
| cell C6 can only be a 8 | |
| cell E5 can only be a 8 | |
| cell F8 is the only cell in row F that can be a 8 | |
| cell H7 is the only cell in row H that can be a 8 | |
| cell G7 is the only cell in column 7 that can be a 2 | |
| cell G3 can only be a 7 | |
| cell D3 can only be a 2 | |
| cell D5 can only be a 5 | |
| no 5s can be placed in column 7 | |
| backtracking | |
| cell C5 cannot be filled | |
| backtracking | |
| guessing that cell C4 is a 8 | |
| cell G4 can only be a 2 | |
| cell H7 is the only cell in column 7 that can be a 2 | |
| cell D7 is the only cell in column 7 that can be a 5 | |
| cell F5 is the only cell in row F that can be a 5 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell D3 can only be a 7 | |
| cell G3 can only be a 8 | |
| cell G7 can only be a 6 | |
| cell C7 can only be a 3 | |
| cell C9 can only be a 6 | |
| cell E7 can only be a 8 | |
| no 8s can be placed in row F | |
| backtracking | |
| cell C4 cannot be filled | |
| backtracking | |
| cell C2 cannot be filled | |
| backtracking | |
| guessing that cell B5 is a 9 | |
| cell C9 is the only cell in row C that can be a 9 | |
| cell C7 is the only cell in row C that can be a 3 | |
| guessing that cell B7 is a 1 | |
| cell B8 can only be a 6 | |
| guessing that cell C2 is a 4 | |
| cell C3 can only be a 7 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell D6 is the only cell in row D that can be a 9 | |
| cell E2 is the only cell in row E that can be a 9 | |
| cell E4 is the only cell in row E that can be a 3 | |
| cell D8 is the only cell in row D that can be a 3 | |
| cell E3 is the only cell in row E that can be a 4 | |
| cell D3 can only be a 2 | |
| cell F1 cannot be filled | |
| backtracking | |
| guessing that cell C2 is a 7 | |
| cell C3 can only be a 4 | |
| cell E3 can only be a 1 | |
| cell F4 is the only cell in row F that can be a 1 | |
| guessing that cell C4 is a 2 | |
| cell G4 can only be a 8 | |
| cell J3 is the only cell in column 3 that can be a 8 | |
| guessing that cell C5 is a 6 | |
| cell C6 can only be a 8 | |
| cell E5 can only be a 8 | |
| cell E7 can only be a 6 | |
| cell D7 can only be a 5 | |
| cell D5 can only be a 2 | |
| cell D3 can only be a 7 | |
| cell E6 can only be a 9 | |
| cell D6 can only be a 6 | |
| cell F5 can only be a 5 | |
| cell G3 can only be a 2 | |
| cell G7 cannot be filled | |
| backtracking | |
| guessing that cell C5 is a 8 | |
| cell C6 can only be a 6 | |
| cell E5 can only be a 6 | |
| cell E7 can only be a 8 | |
| no 8s can be placed in row F | |
| backtracking | |
| cell C5 cannot be filled | |
| backtracking | |
| guessing that cell C4 is a 8 | |
| cell G4 can only be a 2 | |
| cell H7 is the only cell in column 7 that can be a 2 | |
| cell D7 is the only cell in column 7 that can be a 5 | |
| cell F5 is the only cell in row F that can be a 5 | |
| cell F1 is the only cell in row F that can be a 2 | |
| cell D3 can only be a 7 | |
| cell G3 can only be a 8 | |
| cell G7 can only be a 6 | |
| no 6s can be placed in column 9 | |
| backtracking | |
| cell C4 cannot be filled | |
| backtracking | |
| cell C2 cannot be filled | |
| backtracking | |
| guessing that cell B7 is a 6 | |
| cell B8 can only be a 1 | |
| cell D7 can only be a 5 | |
| cell E7 can only be a 8 | |
| cell E5 can only be a 6 | |
| cell D5 can only be a 2 | |
| cell C5 can only be a 8 | |
| cell C4 can only be a 2 | |
| cell C6 can only be a 6 | |
| cell D6 can only be a 9 | |
| cell E6 can only be a 1 | |
| cell E3 can only be a 4 | |
| cell C3 can only be a 7 | |
| cell D3 cannot be filled | |
| backtracking | |
| cell B7 cannot be filled | |
| backtracking | |
| cell B5 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 4 | |
| cell B4 can only be a 7 | |
| cell C3 can only be a 7 | |
| cell C2 can only be a 3 | |
| cell C7 can only be a 6 | |
| cell C9 can only be a 9 | |
| cell D1 is the only cell in row D that can be a 7 | |
| cell G2 is the only cell in row G that can be a 7 | |
| cell F1 is the only cell in column 1 that can be a 3 | |
| cell J9 is the only cell in column 9 that can be a 3 | |
| cell J2 is the only cell in row J that can be a 5 | |
| cell G9 is the only cell in column 9 that can be a 6 | |
| cell J1 is the only cell in row J that can be a 6 | |
| cell D8 is the only cell in column 8 that can be a 6 | |
| cell B8 is the only cell in column 8 that can be a 3 | |
| cell B7 can only be a 1 | |
| cell D3 is the only cell in the left box that can be a 2 | |
| cell J6 is the only cell in row J that can be a 2 | |
| cell E2 is the only cell in the left box that can be a 9 | |
| guessing that cell B5 is a 6 | |
| cell B6 can only be a 9 | |
| cell D6 can only be a 4 | |
| cell C6 can only be a 8 | |
| cell C5 can only be a 2 | |
| cell C4 can only be a 4 | |
| cell D4 can only be a 3 | |
| cell D7 can only be a 5 | |
| cell D5 can only be a 9 | |
| cell E5 can only be a 8 | |
| cell E4 can only be a 1 | |
| cell E3 can only be a 4 | |
| cell E6 can only be a 6 | |
| cell E7 can only be a 3 | |
| cell F2 can only be a 1 | |
| cell F4 can only be a 2 | |
| cell F5 can only be a 5 | |
| cell F9 can only be a 4 | |
| cell F8 can only be a 8 | |
| cell G4 can only be a 8 | |
| cell G3 can only be a 1 | |
| cell G7 can only be a 2 | |
| cell G1 can only be a 9 | |
| cell G8 can only be a 4 | |
| cell H1 can only be a 2 | |
| cell H2 can only be a 4 | |
| cell H6 can only be a 1 | |
| cell H7 can only be a 8 | |
| cell H8 can only be a 9 | |
| cell H9 can only be a 5 | |
| cell J3 can only be a 8 | |
| cell J8 can only be a 1 | |
| done! | |
| solution: | |
| 8 6 9 5 1 3 4 7 2 | |
| 4 2 5 7 6 9 1 3 8 | |
| 1 3 7 4 2 8 6 5 9 | |
| 7 8 2 3 9 4 5 6 1 | |
| 5 9 4 1 8 6 3 2 7 | |
| 3 1 6 2 5 7 9 8 4 | |
| 9 7 1 8 3 5 2 4 6 | |
| 2 4 3 6 7 1 8 9 5 | |
| 6 5 8 9 4 2 7 1 3 |
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| cell J6 is the only cell in the bottom box that can be a 2 | |
| guessing that cell A2 is a 1 | |
| guessing that cell A3 is a 2 | |
| guessing that cell A4 is a 5 | |
| cell A5 is the only cell in row A that can be a 8 | |
| cell B8 is the only cell in row B that can be a 5 | |
| guessing that cell A7 is a 7 | |
| cell A9 can only be a 9 | |
| guessing that cell B1 is a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell H4 can only be a 8 | |
| cell H1 can only be a 5 | |
| cell H6 can only be a 9 | |
| cell B6 can only be a 7 | |
| cell B2 can only be a 9 | |
| cell B3 can only be a 8 | |
| cell C3 can only be a 7 | |
| cell C6 can only be a 1 | |
| cell E6 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 6 | |
| cell B9 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell C1 can only be a 4 | |
| cell B3 is the only cell in row B that can be a 8 | |
| cell G8 is the only cell in row G that can be a 8 | |
| cell J1 is the only cell in row J that can be a 8 | |
| cell H1 can only be a 5 | |
| cell F6 is the only cell in column 6 that can be a 5 | |
| cell D3 is the only cell in row D that can be a 5 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell E4 can only be a 2 | |
| cell E1 can only be a 1 | |
| no 1s can be placed in column 6 | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| cell J8 is the only cell in row J that can be a 8 | |
| cell G3 is the only cell in row G that can be a 8 | |
| cell J1 is the only cell in the bottom-left box that can be a 1 | |
| guessing that cell B2 is a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell H4 can only be a 8 | |
| cell J2 can only be a 3 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell J9 can only be a 4 | |
| cell F6 is the only cell in row F that can be a 8 | |
| cell H9 is the only cell in row H that can be a 7 | |
| cell G5 is the only cell in column 5 that can be a 3 | |
| cell G7 is the only cell in row G that can be a 5 | |
| cell J7 can only be a 9 | |
| cell J5 can only be a 5 | |
| no 5s can be placed in column 6 | |
| backtracking | |
| guessing that cell B2 is a 6 | |
| cell B9 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell C1 can only be a 4 | |
| cell H1 can only be a 5 | |
| cell J9 can only be a 4 | |
| cell J2 can only be a 3 | |
| cell F2 can only be a 4 | |
| cell E2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell H3 can only be a 4 | |
| cell E5 is the only cell in row E that can be a 4 | |
| cell D7 is the only cell in row D that can be a 4 | |
| cell E6 is the only cell in row E that can be a 7 | |
| cell B6 can only be a 9 | |
| cell B3 can only be a 7 | |
| cell C3 can only be a 9 | |
| cell C6 can only be a 1 | |
| cell C4 can only be a 3 | |
| cell C5 can only be a 7 | |
| cell H4 can only be a 8 | |
| cell H6 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 7 | |
| cell B6 can only be a 9 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 9 | |
| cell G2 can only be a 3 | |
| cell G5 can only be a 5 | |
| cell G7 can only be a 2 | |
| cell C7 can only be a 3 | |
| cell C8 can only be a 2 | |
| cell G8 can only be a 1 | |
| cell G9 can only be a 7 | |
| cell H4 can only be a 8 | |
| cell H6 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B6 can only be a 7 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 7 | |
| cell E6 can only be a 1 | |
| cell C6 can only be a 9 | |
| cell C5 can only be a 4 | |
| cell C4 can only be a 1 | |
| cell H4 can only be a 8 | |
| cell H6 can only be a 5 | |
| no 5s can be placed in the bottom-left box | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A7 is a 9 | |
| cell A9 can only be a 7 | |
| guessing that cell B1 is a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell H4 can only be a 8 | |
| cell H1 can only be a 5 | |
| cell H6 can only be a 9 | |
| cell B6 can only be a 7 | |
| cell B2 can only be a 9 | |
| cell B3 can only be a 8 | |
| cell C3 can only be a 7 | |
| cell C6 can only be a 1 | |
| cell E6 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 6 | |
| cell B9 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell C1 can only be a 4 | |
| cell B3 is the only cell in row B that can be a 8 | |
| cell G8 is the only cell in row G that can be a 8 | |
| cell J1 is the only cell in row J that can be a 8 | |
| cell H1 can only be a 5 | |
| cell F6 is the only cell in column 6 that can be a 5 | |
| cell D3 is the only cell in row D that can be a 5 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell E4 can only be a 2 | |
| cell E1 can only be a 1 | |
| no 1s can be placed in column 6 | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| cell J8 is the only cell in row J that can be a 8 | |
| cell G3 is the only cell in row G that can be a 8 | |
| cell J1 is the only cell in the bottom-left box that can be a 1 | |
| guessing that cell B2 is a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell H4 can only be a 8 | |
| cell J2 can only be a 3 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell F6 is the only cell in row F that can be a 8 | |
| cell H7 is the only cell in row H that can be a 7 | |
| cell H8 is the only cell in row H that can be a 6 | |
| cell E5 is the only cell in row E that can be a 6 | |
| cell D7 is the only cell in row D that can be a 6 | |
| cell E6 is the only cell in row E that can be a 7 | |
| cell B6 can only be a 9 | |
| cell B3 can only be a 7 | |
| cell C3 can only be a 9 | |
| cell C6 can only be a 1 | |
| cell C4 can only be a 4 | |
| cell C5 can only be a 7 | |
| cell H6 can only be a 5 | |
| no 5s can be placed in the bottom-left box | |
| backtracking | |
| guessing that cell B2 is a 6 | |
| cell B9 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell C1 can only be a 4 | |
| cell H1 can only be a 5 | |
| cell G2 is the only cell in column 2 that can be a 7 | |
| cell H7 is the only cell in row H that can be a 7 | |
| cell E2 is the only cell in column 2 that can be a 9 | |
| cell F6 is the only cell in column 6 that can be a 5 | |
| cell D3 is the only cell in row D that can be a 5 | |
| cell D9 is the only cell in row D that can be a 1 | |
| cell G9 can only be a 2 | |
| cell F4 is the only cell in row F that can be a 8 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell E4 can only be a 2 | |
| cell E1 can only be a 6 | |
| cell D1 can only be a 2 | |
| cell E8 can only be a 3 | |
| cell G5 can only be a 5 | |
| cell G7 can only be a 3 | |
| cell G8 can only be a 1 | |
| cell H3 can only be a 4 | |
| cell E3 can only be a 1 | |
| no 1s can be placed in row F | |
| backtracking | |
| guessing that cell B2 is a 7 | |
| cell B6 can only be a 9 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 9 | |
| cell G2 can only be a 3 | |
| cell G5 can only be a 5 | |
| cell H4 can only be a 8 | |
| cell H6 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B6 can only be a 7 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 7 | |
| cell E6 can only be a 1 | |
| cell C6 can only be a 9 | |
| cell C5 can only be a 4 | |
| cell C4 can only be a 1 | |
| cell H4 can only be a 8 | |
| cell H6 can only be a 5 | |
| no 5s can be placed in the bottom-left box | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| cell A7 cannot be filled | |
| backtracking | |
| guessing that cell A4 is a 8 | |
| guessing that cell A5 is a 5 | |
| cell B8 is the only cell in row B that can be a 5 | |
| guessing that cell A7 is a 7 | |
| cell A9 can only be a 9 | |
| guessing that cell B1 is a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 8 | |
| cell H6 can only be a 9 | |
| cell B6 can only be a 7 | |
| cell B2 can only be a 9 | |
| cell B3 can only be a 8 | |
| cell C3 can only be a 7 | |
| cell C6 can only be a 1 | |
| cell E6 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 6 | |
| cell B9 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell C1 can only be a 4 | |
| cell B3 is the only cell in row B that can be a 8 | |
| guessing that cell B2 is a 7 | |
| cell B6 can only be a 9 | |
| cell C3 can only be a 9 | |
| cell G2 can only be a 3 | |
| cell G5 can only be a 8 | |
| cell H6 can only be a 5 | |
| cell H1 can only be a 8 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell C6 can only be a 7 | |
| cell C5 can only be a 3 | |
| cell E4 can only be a 2 | |
| cell E1 can only be a 1 | |
| cell E6 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B6 can only be a 7 | |
| cell C3 can only be a 7 | |
| cell E6 can only be a 1 | |
| cell C6 can only be a 9 | |
| cell C5 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell E1 can only be a 2 | |
| cell E4 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| guessing that cell B2 is a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell J2 can only be a 3 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell H3 can only be a 8 | |
| cell H6 can only be a 9 | |
| cell B6 can only be a 7 | |
| cell B3 can only be a 9 | |
| cell C3 can only be a 7 | |
| cell C6 can only be a 1 | |
| cell E6 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 6 | |
| cell B9 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell C1 can only be a 4 | |
| cell H1 can only be a 5 | |
| no 5s can be placed in the bottom box | |
| backtracking | |
| guessing that cell B2 is a 7 | |
| cell B6 can only be a 9 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 9 | |
| cell G2 can only be a 3 | |
| cell G5 can only be a 8 | |
| cell H4 can only be a 5 | |
| cell H6 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B6 can only be a 7 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 7 | |
| cell E6 can only be a 1 | |
| cell C6 can only be a 9 | |
| cell C5 can only be a 4 | |
| cell C4 can only be a 1 | |
| cell D5 can only be a 6 | |
| cell E5 can only be a 7 | |
| cell F5 can only be a 8 | |
| cell F6 can only be a 5 | |
| cell G5 can only be a 3 | |
| cell G2 can only be a 7 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 2 | |
| cell E4 can only be a 4 | |
| cell F4 can only be a 2 | |
| cell H6 can only be a 8 | |
| cell H3 can only be a 3 | |
| cell J2 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A7 is a 9 | |
| cell A9 can only be a 7 | |
| guessing that cell B1 is a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 8 | |
| cell H6 can only be a 9 | |
| cell B6 can only be a 7 | |
| cell B2 can only be a 9 | |
| cell B3 can only be a 8 | |
| cell C3 can only be a 7 | |
| cell C6 can only be a 1 | |
| cell E6 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 6 | |
| cell B9 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell C1 can only be a 4 | |
| cell B3 is the only cell in row B that can be a 8 | |
| guessing that cell B2 is a 7 | |
| cell B6 can only be a 9 | |
| cell C3 can only be a 9 | |
| cell G2 can only be a 3 | |
| cell G5 can only be a 8 | |
| cell H6 can only be a 5 | |
| cell H1 can only be a 8 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell C6 can only be a 7 | |
| cell C5 can only be a 3 | |
| cell E4 can only be a 2 | |
| cell E1 can only be a 1 | |
| cell E6 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B6 can only be a 7 | |
| cell C3 can only be a 7 | |
| cell E6 can only be a 1 | |
| cell C6 can only be a 9 | |
| cell C5 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell E1 can only be a 2 | |
| cell E4 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| guessing that cell B2 is a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell J2 can only be a 3 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell H3 can only be a 8 | |
| cell H6 can only be a 9 | |
| cell B6 can only be a 7 | |
| cell B3 can only be a 9 | |
| cell C3 can only be a 7 | |
| cell C6 can only be a 1 | |
| cell E6 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 6 | |
| cell B9 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell C1 can only be a 4 | |
| cell H1 can only be a 5 | |
| no 5s can be placed in the bottom box | |
| backtracking | |
| guessing that cell B2 is a 7 | |
| cell B6 can only be a 9 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 9 | |
| cell G2 can only be a 3 | |
| cell G5 can only be a 8 | |
| cell H4 can only be a 5 | |
| cell H6 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B6 can only be a 7 | |
| cell B3 can only be a 4 | |
| cell B4 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 7 | |
| cell E6 can only be a 1 | |
| cell C6 can only be a 9 | |
| cell C5 can only be a 4 | |
| cell C4 can only be a 1 | |
| cell D5 can only be a 6 | |
| cell E5 can only be a 7 | |
| cell F5 can only be a 8 | |
| cell F6 can only be a 5 | |
| cell G5 can only be a 3 | |
| cell G2 can only be a 7 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell E1 can only be a 2 | |
| cell E4 can only be a 4 | |
| cell F4 can only be a 2 | |
| cell H6 can only be a 8 | |
| cell H3 can only be a 3 | |
| cell J2 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| cell A7 cannot be filled | |
| backtracking | |
| guessing that cell A5 is a 7 | |
| cell A9 can only be a 9 | |
| cell A7 can only be a 5 | |
| cell E6 is the only cell in row E that can be a 7 | |
| guessing that cell B1 is a 4 | |
| cell C1 can only be a 6 | |
| cell B3 is the only cell in row B that can be a 8 | |
| guessing that cell B2 is a 7 | |
| cell C3 can only be a 9 | |
| cell C6 can only be a 1 | |
| cell G2 can only be a 3 | |
| cell J2 can only be a 4 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell B6 is the only cell in row B that can be a 9 | |
| cell B4 is the only cell in row B that can be a 5 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 4 | |
| cell C5 can only be a 3 | |
| cell C8 can only be a 2 | |
| cell C7 can only be a 7 | |
| cell G7 can only be a 2 | |
| cell H7 is the only cell in row H that can be a 9 | |
| cell J7 can only be a 3 | |
| cell F7 can only be a 4 | |
| cell D7 can only be a 6 | |
| cell J9 can only be a 1 | |
| cell D9 can only be a 2 | |
| cell F9 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell B8 can only be a 3 | |
| cell E8 can only be a 1 | |
| cell E1 can only be a 2 | |
| cell E4 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B6 can only be a 5 | |
| cell B4 can only be a 3 | |
| cell B8 can only be a 6 | |
| cell B9 can only be a 7 | |
| cell C3 can only be a 7 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 8 | |
| cell H6 can only be a 9 | |
| cell C6 can only be a 1 | |
| cell C4 can only be a 4 | |
| cell C5 can only be a 9 | |
| cell F6 can only be a 8 | |
| cell H8 can only be a 3 | |
| cell C8 can only be a 2 | |
| cell C7 can only be a 3 | |
| cell E8 can only be a 1 | |
| cell E1 can only be a 2 | |
| cell E4 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| guessing that cell B1 is a 6 | |
| cell B8 can only be a 3 | |
| cell B9 can only be a 7 | |
| cell C1 can only be a 4 | |
| cell B2 can only be a 9 | |
| cell B3 can only be a 8 | |
| cell B6 can only be a 5 | |
| cell B4 can only be a 4 | |
| cell C3 can only be a 7 | |
| cell E3 is the only cell in row E that can be a 9 | |
| cell E2 is the only cell in row E that can be a 3 | |
| cell G2 can only be a 7 | |
| cell J2 can only be a 4 | |
| cell F2 can only be a 6 | |
| cell E5 is the only cell in row E that can be a 4 | |
| cell E8 is the only cell in row E that can be a 6 | |
| cell C8 can only be a 2 | |
| cell C7 can only be a 6 | |
| cell D5 is the only cell in row D that can be a 6 | |
| cell H9 is the only cell in row H that can be a 6 | |
| cell H7 is the only cell in row H that can be a 4 | |
| no 7s can be placed in row H | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| guessing that cell B2 is a 4 | |
| cell C1 can only be a 6 | |
| cell J2 can only be a 3 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell G2 can only be a 7 | |
| guessing that cell B3 is a 7 | |
| cell C3 can only be a 9 | |
| cell C6 can only be a 1 | |
| cell B6 is the only cell in row B that can be a 9 | |
| cell B4 is the only cell in row B that can be a 5 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 4 | |
| cell C5 can only be a 3 | |
| cell C8 can only be a 2 | |
| cell C7 can only be a 7 | |
| cell H9 is the only cell in row H that can be a 7 | |
| cell H7 is the only cell in row H that can be a 9 | |
| cell J7 can only be a 4 | |
| cell J9 can only be a 1 | |
| cell J1 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell H3 can only be a 8 | |
| cell G3 can only be a 1 | |
| cell H6 can only be a 5 | |
| cell F6 can only be a 8 | |
| cell G5 can only be a 8 | |
| cell H8 can only be a 6 | |
| cell B8 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell E8 can only be a 1 | |
| cell E1 can only be a 2 | |
| cell E4 cannot be filled | |
| backtracking | |
| guessing that cell B3 is a 9 | |
| cell B6 can only be a 5 | |
| cell B4 can only be a 3 | |
| cell B8 can only be a 6 | |
| cell B9 can only be a 7 | |
| cell C3 can only be a 7 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell H3 can only be a 8 | |
| cell H6 can only be a 9 | |
| cell C6 can only be a 1 | |
| cell C4 can only be a 4 | |
| cell C5 can only be a 9 | |
| cell F6 can only be a 8 | |
| cell H8 can only be a 3 | |
| cell C8 can only be a 2 | |
| cell C7 can only be a 3 | |
| cell E8 can only be a 1 | |
| cell E1 can only be a 2 | |
| cell E4 cannot be filled | |
| backtracking | |
| cell B3 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 6 | |
| cell B8 can only be a 3 | |
| cell B9 can only be a 7 | |
| cell C1 can only be a 4 | |
| cell B3 can only be a 9 | |
| cell B6 can only be a 5 | |
| cell B4 can only be a 4 | |
| cell C3 can only be a 7 | |
| cell H1 can only be a 5 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell C6 can only be a 9 | |
| cell C5 can only be a 3 | |
| cell E4 can only be a 2 | |
| cell F4 can only be a 5 | |
| cell H6 can only be a 8 | |
| cell F6 can only be a 1 | |
| cell G5 can only be a 5 | |
| cell H3 can only be a 4 | |
| cell F3 can only be a 3 | |
| no 3s can be placed in row E | |
| backtracking | |
| guessing that cell B2 is a 7 | |
| cell G2 can only be a 3 | |
| cell J2 can only be a 4 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell H1 can only be a 5 | |
| cell H4 can only be a 3 | |
| cell J1 can only be a 1 | |
| cell J9 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell B8 can only be a 3 | |
| cell C8 can only be a 2 | |
| cell C7 can only be a 7 | |
| cell G7 can only be a 2 | |
| cell J7 can only be a 9 | |
| cell C5 is the only cell in row C that can be a 3 | |
| no 9s can be placed in column 5 | |
| backtracking | |
| guessing that cell B2 is a 9 | |
| cell B6 can only be a 5 | |
| cell E3 is the only cell in row E that can be a 9 | |
| cell G2 is the only cell in column 2 that can be a 7 | |
| cell C1 is the only cell in the top-left box that can be a 6 | |
| guessing that cell B3 is a 4 | |
| cell B4 can only be a 3 | |
| cell B8 can only be a 6 | |
| cell B9 can only be a 7 | |
| cell C3 can only be a 7 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell J2 can only be a 3 | |
| cell H3 can only be a 8 | |
| cell H6 can only be a 9 | |
| cell C6 can only be a 1 | |
| cell C4 can only be a 4 | |
| cell C5 can only be a 9 | |
| cell F6 can only be a 8 | |
| cell H8 can only be a 3 | |
| no 3s can be placed in row E | |
| backtracking | |
| guessing that cell B3 is a 7 | |
| cell C3 can only be a 4 | |
| cell B4 is the only cell in row B that can be a 4 | |
| cell C7 is the only cell in row C that can be a 7 | |
| cell C8 is the only cell in row C that can be a 2 | |
| cell H9 is the only cell in row H that can be a 7 | |
| guessing that cell B8 is a 3 | |
| cell B9 can only be a 6 | |
| cell E2 is the only cell in row E that can be a 3 | |
| cell J2 can only be a 4 | |
| cell F2 can only be a 6 | |
| cell H1 can only be a 5 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell C6 can only be a 9 | |
| cell C5 can only be a 3 | |
| cell E4 can only be a 2 | |
| cell F4 can only be a 5 | |
| cell F3 can only be a 1 | |
| no 1s can be placed in column 6 | |
| backtracking | |
| guessing that cell B8 is a 6 | |
| cell B9 can only be a 3 | |
| cell H7 is the only cell in row H that can be a 6 | |
| cell H1 is the only cell in row H that can be a 4 | |
| cell J2 can only be a 3 | |
| cell E8 is the only cell in row E that can be a 3 | |
| cell F3 is the only cell in row F that can be a 3 | |
| cell H4 is the only cell in row H that can be a 3 | |
| cell C4 can only be a 1 | |
| cell C6 can only be a 9 | |
| no 9s can be placed in row H | |
| backtracking | |
| cell B8 cannot be filled | |
| backtracking | |
| cell B3 cannot be filled | |
| backtracking | |
| cell B2 cannot be filled | |
| backtracking | |
| cell B1 cannot be filled | |
| backtracking | |
| guessing that cell A5 is a 9 | |
| cell A9 can only be a 7 | |
| cell A7 can only be a 5 | |
| cell H6 is the only cell in column 6 that can be a 9 | |
| cell F6 is the only cell in column 6 that can be a 8 | |
| cell B6 is the only cell in column 6 that can be a 5 | |
| guessing that cell B1 is a 4 | |
| cell B4 can only be a 3 | |
| cell B8 can only be a 6 | |
| cell B9 can only be a 9 | |
| cell B2 can only be a 7 | |
| cell B3 can only be a 8 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 9 | |
| cell G2 can only be a 3 | |
| cell H4 can only be a 5 | |
| cell G5 can only be a 8 | |
| cell H1 can only be a 8 | |
| cell H8 can only be a 3 | |
| cell C8 can only be a 2 | |
| cell C7 can only be a 3 | |
| cell E8 can only be a 1 | |
| cell E1 can only be a 2 | |
| cell E4 can only be a 4 | |
| cell C4 can only be a 1 | |
| no 1s can be placed in column 6 | |
| backtracking | |
| guessing that cell B1 is a 6 | |
| cell B8 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell B9 can only be a 9 | |
| cell B2 can only be a 7 | |
| cell B3 can only be a 8 | |
| cell C1 can only be a 4 | |
| cell C3 can only be a 9 | |
| cell G2 can only be a 3 | |
| cell J2 can only be a 4 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell E3 is the only cell in row E that can be a 3 | |
| cell E5 is the only cell in row E that can be a 4 | |
| cell F5 can only be a 5 | |
| cell D5 can only be a 6 | |
| cell G5 can only be a 8 | |
| cell J5 can only be a 3 | |
| cell C5 can only be a 7 | |
| cell C6 can only be a 1 | |
| cell C4 can only be a 3 | |
| cell E6 can only be a 7 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 8 | |
| cell H3 can only be a 7 | |
| cell H8 can only be a 6 | |
| no 6s can be placed in row E | |
| backtracking | |
| guessing that cell B1 is a 8 | |
| guessing that cell B2 is a 4 | |
| cell B4 can only be a 3 | |
| cell B8 can only be a 6 | |
| cell B9 can only be a 9 | |
| cell B3 can only be a 7 | |
| cell C1 can only be a 6 | |
| cell C3 can only be a 9 | |
| cell H4 can only be a 5 | |
| cell H1 can only be a 4 | |
| cell J2 can only be a 3 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell G2 can only be a 7 | |
| cell H3 can only be a 8 | |
| cell H8 can only be a 3 | |
| cell C8 can only be a 2 | |
| cell C7 can only be a 3 | |
| cell E8 can only be a 1 | |
| cell E1 can only be a 2 | |
| cell E4 can only be a 4 | |
| cell C4 can only be a 1 | |
| no 1s can be placed in column 6 | |
| backtracking | |
| guessing that cell B2 is a 6 | |
| cell B8 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell B9 can only be a 9 | |
| cell B3 can only be a 7 | |
| cell C1 can only be a 4 | |
| cell C3 can only be a 9 | |
| cell H1 can only be a 5 | |
| cell H4 can only be a 3 | |
| cell C4 can only be a 1 | |
| cell C6 can only be a 7 | |
| cell C5 can only be a 3 | |
| cell E4 can only be a 2 | |
| cell E6 can only be a 1 | |
| cell E1 can only be a 6 | |
| cell E8 cannot be filled | |
| backtracking | |
| guessing that cell B2 is a 7 | |
| cell G2 can only be a 3 | |
| cell J2 can only be a 4 | |
| cell F2 can only be a 6 | |
| cell E2 can only be a 9 | |
| cell H1 can only be a 5 | |
| cell H4 can only be a 3 | |
| cell B4 can only be a 4 | |
| cell B3 can only be a 9 | |
| cell C3 can only be a 4 | |
| cell C1 can only be a 6 | |
| cell C4 can only be a 1 | |
| cell C6 can only be a 7 | |
| cell C5 can only be a 3 | |
| cell C8 can only be a 2 | |
| cell C7 can only be a 9 | |
| cell E4 can only be a 2 | |
| cell E6 can only be a 1 | |
| cell E1 can only be a 4 | |
| cell E3 can only be a 3 | |
| cell E8 can only be a 6 | |
| cell B8 can only be a 3 | |
| cell B9 can only be a 6 | |
| cell E5 can only be a 7 | |
| cell F4 can only be a 5 | |
| cell F3 can only be a 1 | |
| cell D1 can only be a 2 | |
| cell D3 can only be a 5 | |
| cell D7 can only be a 4 | |
| cell D5 can only be a 6 | |
| cell D9 can only be a 1 | |
| cell F5 can only be a 4 | |
| cell G9 can only be a 2 | |
| cell F9 can only be a 3 | |
| cell F7 can only be a 2 | |
| cell G7 can only be a 7 | |
| cell G3 can only be a 8 | |
| cell G5 can only be a 5 | |
| cell G8 can only be a 1 | |
| cell H3 can only be a 7 | |
| cell H7 can only be a 6 | |
| cell H8 can only be a 8 | |
| cell H9 can only be a 4 | |
| cell J1 can only be a 1 | |
| cell J5 can only be a 8 | |
| cell J7 can only be a 3 | |
| cell J8 can only be a 5 | |
| cell J9 can only be a 9 | |
| done! | |
| solution: | |
| 3 1 2 8 9 6 5 4 7 | |
| 8 7 9 4 2 5 1 3 6 | |
| 6 5 4 1 3 7 9 2 8 | |
| 2 8 5 9 6 3 4 7 1 | |
| 4 9 3 2 7 1 8 6 5 | |
| 7 6 1 5 4 8 2 9 3 | |
| 9 3 8 6 5 4 7 1 2 | |
| 5 2 7 3 1 9 6 8 4 | |
| 1 4 6 7 8 2 3 5 9 |
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