Compact tic tac toe (C)

tic-tac-toe.c

#include <stdio.h>

#define EMPTY -1

// translate human-readable coordinates to char indexes on board
int translateRow[4] = {EMPTY, 22, 42, 62};
int translateCol[4] = {EMPTY, 0, 2, 4};
char currentPiece[2] = "OX";
// ---- translateWinConditions explanation ----
// 9 is for the squares on the board, as follows
// 0 1 2
// 3 4 5
// 6 7 8
// 4 is for the total amount of win conditions that
//   could possibly be modified by a tile's status
// there are 8 win conditions:
// 0, 1, 2 - top, middle, bottom - completed row
// 3, 4, 5 - left, middle, right - completed column
// 6, 7    - down, up (towards right) - completed diagonal
// EMPTY slots aren't used (see lines 52-55)
int translateWinConditions[9][4] = {{0, 3, 6, EMPTY}, {0, 4, EMPTY, EMPTY}, {0, 5, 7, EMPTY}, {1, 3, EMPTY, EMPTY}, {1, 4, 6, 7}, {1, 5, EMPTY, EMPTY}, {2, 3, 7, EMPTY}, {2, 4, EMPTY, EMPTY}, {2, 5, 6, EMPTY}};

int main()
{
    char board[79] = "   1 2 3\n  +-+-+-+\n1 | | | |\n  +-+-+-+\n2 | | | |\n  +-+-+-+\n3 | | | |\n  +-+-+-+";
    int moves = 0, inputRow, inputCol;
    for (;;)
    {
        inputRow = 0, inputCol = 0;
        do
        {
            printf("Enter input (row, col): ");
            scanf("%i, %i", &inputRow, &inputCol);
        }
        while ((inputRow < 1 || inputRow > 3) || (inputCol < 1 || inputCol > 3));

        int boardIndex = translateRow[inputRow] + translateCol[inputCol];
        if (board[boardIndex] == ' ')
        {
            board[boardIndex] = currentPiece[moves % 2];
            moves++;
            puts(board);
            if (moves > 4)
            {
                for (int knotOrCross = 0; knotOrCross < 2; knotOrCross++)
                {
                    int winConditions[8] = {0, 0, 0, 0, 0, 0, 0, 0};
                    for (int i = 0; i < 9; i++)
                    {
                        for (int j = 0; j < 4; j++)
                        {
                            if (translateWinConditions[i][j] == EMPTY)
                            {
                                continue;
                            }
                            short piecesInLine = winConditions[translateWinConditions[i][j]] += (board[translateRow[(i / 3) + 1] + translateCol[(i % 3) + 1]] == currentPiece[knotOrCross]);
                            if (piecesInLine > 2)
                            {
                                printf("%c Wins!!!\n", currentPiece[knotOrCross]);
                                return 0;
                            }
                        }
                    }
                }
            }
        }
        else
        {
            printf("That space is occupied.\n");
        }
    }
}

This is very impressive and plays well in a Terminal window. Amazing that it is so compact!