Test positions for debugging chess engines. Formatted as JSON array of FEN strings
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| [ | |
| { | |
| "depth":1, | |
| "nodes":8, | |
| "fen":"r6r/1b2k1bq/8/8/7B/8/8/R3K2R b KQ - 3 2" | |
| }, | |
| { | |
| "depth":1, | |
| "nodes":8, | |
| "fen":"8/8/8/2k5/2pP4/8/B7/4K3 b - d3 0 3" | |
| }, | |
| { | |
| "depth":1, | |
| "nodes":19, | |
| "fen":"r1bqkbnr/pppppppp/n7/8/8/P7/1PPPPPPP/RNBQKBNR w KQkq - 2 2" | |
| }, | |
| { | |
| "depth":1, | |
| "nodes":5, | |
| "fen":"r3k2r/p1pp1pb1/bn2Qnp1/2qPN3/1p2P3/2N5/PPPBBPPP/R3K2R b KQkq - 3 2" | |
| }, | |
| { | |
| "depth":1, | |
| "nodes":44, | |
| "fen":"2kr3r/p1ppqpb1/bn2Qnp1/3PN3/1p2P3/2N5/PPPBBPPP/R3K2R b KQ - 3 2" | |
| }, | |
| { | |
| "depth":1, | |
| "nodes":39, | |
| "fen":"rnb2k1r/pp1Pbppp/2p5/q7/2B5/8/PPPQNnPP/RNB1K2R w KQ - 3 9" | |
| }, | |
| { | |
| "depth":1, | |
| "nodes":9, | |
| "fen":"2r5/3pk3/8/2P5/8/2K5/8/8 w - - 5 4" | |
| }, | |
| { | |
| "depth":3, | |
| "nodes":62379, | |
| "fen":"rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R w KQ - 1 8" | |
| }, | |
| { | |
| "depth":3, | |
| "nodes":89890, | |
| "fen":"r4rk1/1pp1qppp/p1np1n2/2b1p1B1/2B1P1b1/P1NP1N2/1PP1QPPP/R4RK1 w - - 0 10" | |
| }, | |
| { | |
| "depth":6, | |
| "nodes":1134888, | |
| "fen":"3k4/3p4/8/K1P4r/8/8/8/8 b - - 0 1" | |
| }, | |
| { | |
| "depth":6, | |
| "nodes":1015133, | |
| "fen":"8/8/4k3/8/2p5/8/B2P2K1/8 w - - 0 1" | |
| }, | |
| { | |
| "depth":6, | |
| "nodes":1440467, | |
| "fen":"8/8/1k6/2b5/2pP4/8/5K2/8 b - d3 0 1" | |
| }, | |
| { | |
| "depth":6, | |
| "nodes":661072, | |
| "fen":"5k2/8/8/8/8/8/8/4K2R w K - 0 1" | |
| }, | |
| { | |
| "depth":6, | |
| "nodes":803711, | |
| "fen":"3k4/8/8/8/8/8/8/R3K3 w Q - 0 1" | |
| }, | |
| { | |
| "depth":4, | |
| "nodes":1274206, | |
| "fen":"r3k2r/1b4bq/8/8/8/8/7B/R3K2R w KQkq - 0 1" | |
| }, | |
| { | |
| "depth":4, | |
| "nodes":1720476, | |
| "fen":"r3k2r/8/3Q4/8/8/5q2/8/R3K2R b KQkq - 0 1" | |
| }, | |
| { | |
| "depth":6, | |
| "nodes":3821001, | |
| "fen":"2K2r2/4P3/8/8/8/8/8/3k4 w - - 0 1" | |
| }, | |
| { | |
| "depth":5, | |
| "nodes":1004658, | |
| "fen":"8/8/1P2K3/8/2n5/1q6/8/5k2 b - - 0 1" | |
| }, | |
| { | |
| "depth":6, | |
| "nodes":217342, | |
| "fen":"4k3/1P6/8/8/8/8/K7/8 w - - 0 1" | |
| }, | |
| { | |
| "depth":6, | |
| "nodes":92683, | |
| "fen":"8/P1k5/K7/8/8/8/8/8 w - - 0 1" | |
| }, | |
| { | |
| "depth":6, | |
| "nodes":2217, | |
| "fen":"K1k5/8/P7/8/8/8/8/8 w - - 0 1" | |
| }, | |
| { | |
| "depth":7, | |
| "nodes":567584, | |
| "fen":"8/k1P5/8/1K6/8/8/8/8 w - - 0 1" | |
| }, | |
| { | |
| "depth":4, | |
| "nodes":23527, | |
| "fen":"8/8/2k5/5q2/5n2/8/5K2/8 b - - 0 1" | |
| } | |
| ] |
Some of the FEN notations are messed up. The order in which castling legality is specified must follow "KQkq": https://en.wikipedia.org/wiki/Forsyth–Edwards_Notation (In the german article this is explicitly stated). For example lichess won't recognize this otherwise.
Fixed :)
8/8/8/2k5/2pP4/8/B7/4K3 b - d3 5 3 the pawn push that created the enpassant should have set the halfmoves to 0, my program was failing to load this position because of this (which I know is a problem in my end as my validator should be more relaxed, but just saying).
Thanks @ajax333221, fixed
Thank you! Those helped me find and fix a couple of bugs in my engine.
Very useful list, thankyou
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Some of the FEN notations are messed up. The order in which castling legality is specified must follow "KQkq": https://en.wikipedia.org/wiki/Forsyth–Edwards_Notation (In the german article this is explicitly stated). For example lichess won't recognize this otherwise.