mid game benchmark, white to play r3kb1r/1pBnp1pp/p4p2/1N1n1b2/2BP4/5NP1/P4P1P/R1R3K1 w kq - 0 17

initial state rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 1 1

checkmate in 6 8/8/8/8/8/4K3/5Q2/7k w - - 11 56

checkmate in 1 8/8/8/8/8/6K1/4Q3/6k1 w - - 21 61

github issue 4, castling (slow search) r6r/p3kp1p/4np2/1Bb5/3p4/P4N2/1P3PPP/R3K2R w KQ - 2 18

github issue 4, no castling r6r/p3kp1p/4np2/1Bb5/3p4/P4N2/1P3PPP/R3K2R w - - 2 18

mid game benchmark, black to play r3kb1r/ppBnp1pp/5p2/1N1n1b2/2BP4/5NP1/P4P1P/R1R3K1 b kq - 1 16

late game, rook pins bishop 4k3/4n3/8/3N1R2/4R2p/7P/1r3BK1/8 b - - 6 42

end game, impossible pawn 4p3/8/8/8/8/k6P/6K1/8 b - - 6 42

en passant rn1qkbnr/p1p1pppp/8/1pPp4/3P1B2/8/PP2PPPP/Rb1QKBNR w KQkq b6 0 5

too many pieces rnbqkbnr/pppppppp/nnnnnnnn/PPPPPPPP/pppppppp/NNNNNNNN/PPPPPPPP/RNBQKBNR w KQkq - 1 1

en passant rnb1r1k1/ppp2ppp/8/8/2PN4/2Nn4/P3BPPP/R3K2R w KQ - 5 14

github issue 5, castling r3k2Q/pp3p1p/3qp3/2pp2N1/3P4/4PP2/PP1K2PP/nNB4R b k - 0 15

late-ish 8/p2P1N2/8/4p2k/1p2P3/1P1b2pK/P6P/n7 w - - 0 33

queening opportunities 4kb1R/1p1np1P1/2B2p2/1N1P1b2/8/5NK1/p3rP1p/8 w - - 0 31

mate in 1 5k2/8/5K2/4Q3/5P2/8/8/8 w - - 3 61

incomplete FEN, stalemate rn2k1nr/pp4pp/3p4/q1pP4/P1P2p1b/1b2pPRP/1P1NP1PQ/2B1KBNR w Kkq -

stalemate 5bnr/4p1pq/4Qpkr/7p/2P4P/8/PP1PPPP1/RNB1KBNR b KQ - 0 10

stalemate in 1 (Qxe6) 5bnr/4p1pq/2Q1ppkr/7p/2P4P/8/PP1PPPP1/RNB1KBNR w KQ - 0 10

rook & king 8/7K/8/8/8/8/R7/7k w - - 0 1

zugzwang 8/8/p1p5/1p5p/1P5p/8/PPP2K1p/4R1rk w - - 0 1

earlyish rnq1nrk1/pp3pbp/6p1/3p4/3P4/5N2/PP2BPPP/R1BQK2R w KQ -

checkmate in 2 4kb2/3r1p2/2R3p1/6B1/p6P/P3p1P1/P7/5K2 w - - 0 36

“leonid's position” q2k2q1/2nqn2b/1n1P1n1b/2rnr2Q/1NQ1QN1Q/3Q3B/2RQR2B/Q2K2Q1 w - -

insufficient material 8/7K/8/8/8/8/N7/7k w - - 40 40

sufficient material - knight 8/7K/8/5n2/8/8/N7/7k w - - 40 40

insufficient material - bishops 8/6BK/7B/6b1/7B/8/1B6/7k w - - 40 40

sufficient material - opposing bishops 8/6BK/7B/6b1/7B/8/B7/7k w - - 40 40

sufficient material 8/7K/8/8/7B/8/N7/7k w - - 40 40

castling; various checks r3k2r/p4p1p/4np2/1Bb5/3p4/P3nN2/1P3PPP/R3K2R w KQkq - 2 18

Adrian Dușa's en-passant position r2k3B/ppp2p1p/7n/3p4/8/1P3N2/P4qP1/4RRK1 w q - 0 17

Adrian Dușa's position, no castling r2k3B/ppp2p1p/7n/3p4/8/1P3N2/P4qP1/4RRK1 w - - 0 17

Adrian Dușa's continuation r7/pp1k1p1p/5B1n/2pp4/8/1P3N2/P4RP1/4R1K1 w q - 3 19

blatantly false castling claims 8/7K/8/8/8/8/q7/7k w KQq - 40 40