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Chess engine

C 97.12% Makefile 1.28% Shell 1.60%

chess chess-ai chess-ai-engine chess-engine chess-game

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engine dies

position startpos  moves c2c4 g8f6 b1c3 c7c5 e2e3 g7g6 d2d4 f8g7 d4c5 b8a6 d1d4 d8a5 c1d2 f6h5 c3d5 g7d4 d2a5 d4b2 a1b1 b2g7 g2g4 h5f6 a5c3 e8f8 d5f6 g7f6 c3f6 e7f6 b1b5 a6c7 b5a5 c7e6 f1g2 h7h5 g4h5 h8h5 g2d5 e6c7 e3e4 f6f5 g1e2 f5e4 e2g3 h5e5 e1g1 c7d5 c4d5 e5d5 g3e4 b7b6 a5a3 b6c5 a3h3 c5c4 f1c1 d5d4 e4f6 d7d5 h3h7 f8e7 f6g8 e7f8 g8f6 d4d2 c1e1 c8b7 f6d7 f8g8 d7f6 g8f8 f6d7 f8g8 d7f6
go  wtime 76110 btime 50659
info depth 1
info score cp 0 depth 1 time 0 pv g8f8
info depth 2
info score cp 0 depth 2 time 0 pv g8f8
info depth 3
info score cp 0 depth 3 time 0 pv g8f8
info depth 4
info score cp 0 depth 4 time 0 pv g8f8
info depth 5
info score cp 0 depth 5 time 0 pv g8f8
info depth 6
info score cp 0 depth 6 time 0 pv g8f8
info depth 7
info score cp 0 depth 7 time 0 pv g8f8
info depth 8
info score cp 0 depth 8 time 0 pv g8f8
info depth 9
info score cp 0 depth 9 time 0 pv g8f8
info depth 10
info score cp 0 depth 10 time 0 pv g8f8
info depth 11
info score cp 0 depth 11 time 0 pv g8f8
info depth 12
info score cp 0 depth 12 time 0 pv g8f8
info depth 13
info score cp 0 depth 13 time 0 pv g8f8
info depth 14
info score cp 0 depth 14 time 0 pv g8f8
info depth 15
info score cp 0 depth 15 time 0 pv g8f8
info depth 16
info score cp 0 depth 16 time 0 pv g8f8
info depth 17
info score cp 0 depth 17 time 0 pv g8f8
info depth 18
info score cp 0 depth 18 time 0 pv g8f8
info depth 19
info score cp 0 depth 19 time 0 pv g8f8
info depth 20
info score cp 0 depth 20 time 0 pv g8f8
info depth 21
info score cp 0 depth 21 time 0 pv g8f8
info depth 22
info score cp 0 depth 22 time 0 pv g8f8
info depth 23
info score cp 0 depth 23 time 0 pv g8f8
info depth 24
info score cp 0 depth 24 time 0 pv g8f8
info depth 25
info score cp 0 depth 25 time 0 pv g8f8
info depth 26
info score cp 0 depth 26 time 0 pv g8f8
info depth 27
info score cp 0 depth 27 time 0 pv g8f8
info depth 28
info score cp 0 depth 28 time 0 pv g8f8
info depth 29
info score cp 0 depth 29 time 0 pv g8f8
info depth 30
info score cp 0 depth 30 time 0 pv g8f8
info depth 31
info score cp 0 depth 31 time 0 pv g8f8
info depth 32
info score cp 0 depth 32 time 0 pv g8f8
info depth 33
info score cp 0 depth 33 time 0 pv g8f8
info depth 34
info score cp 0 depth 34 time 0 pv g8f8
info depth 35
info score cp 0 depth 35 time 0 pv g8f8
info depth 36
info score cp 0 depth 36 time 0 pv g8f8
info depth 37
info score cp 0 depth 37 time 0 pv g8f8
info depth 38
info score cp 0 depth 38 time 0 pv g8f8
info depth 39
info score cp 0 depth 39 time 0 pv g8f8
info depth 40
info score cp 0 depth 40 time 0 pv g8f8
info depth 41
info score cp 0 depth 41 time 0 pv g8f8
info depth 42
info score cp 0 depth 42 time 0 pv g8f8
info depth 43
info score cp 0 depth 43 time 0 pv g8f8
info depth 44
info score cp 0 depth 44 time 0 pv g8f8
info depth 45
info score cp 0 depth 45 time 0 pv g8f8
info depth 46
info score cp 0 depth 46 time 0 pv g8f8
info depth 47
info score cp 0 depth 47 time 0 pv g8f8
info depth 48
info score cp 0 depth 48 time 0 pv g8f8
info depth 49
info score cp 0 depth 49 time 0 pv g8f8
info depth 50
info score cp 0 depth 50 time 0 pv g8f8
info depth 51
info score cp 0 depth 51 time 0 pv g8f8
info depth 52
info score cp 0 depth 52 time 0 pv g8f8
info depth 53
info score cp 0 depth 53 time 0 pv g8f8
info depth 54
info score cp 0 depth 54 time 0 pv g8f8
info depth 55
info score cp 0 depth 55 time 0 pv g8f8
info depth 56
info score cp 0 depth 56 time 0 pv g8f8
info depth 57
info score cp 0 depth 57 time 0 pv g8f8
info depth 58
info score cp 0 depth 58 time 0 pv g8f8
info depth 59
info score cp 0 depth 59 time 0 pv g8f8
info depth 60
info score cp 0 depth 60 time 1 pv g8f8
info depth 61
info score cp 0 depth 61 time 1 pv g8f8
info depth 62
info score cp 0 depth 62 time 1 pv g8f8
info depth 63
info score cp 0 depth 63 time 1 pv g8f8
info depth 64
info score cp 0 depth 64 time 1 pv g8f8
info depth 65
info score cp 0 depth 65 time 1 pv g8f8
info depth 66
info score cp 0 depth 66 time 1 pv g8f8
info depth 67
info score cp 0 depth 67 time 1 pv g8f8
info depth 68
info score cp 0 depth 68 time 1 pv g8f8
info depth 69
info score cp 0 depth 69 time 1 pv g8f8
info depth 70
info score cp 0 depth 70 time 1 pv g8f8
info depth 71
info score cp 0 depth 71 time 1 pv g8f8
info depth 72
info score cp 0 depth 72 time 1 pv g8f8
info depth 73
info score cp 0 depth 73 time 1 pv g8f8
info depth 74
info score cp 0 depth 74 time 1 pv g8f8
info depth 75
info score cp 0 depth 75 time 1 pv g8f8
info depth 76
info score cp 0 depth 76 time 1 pv g8f8
info depth 77
info score cp 0 depth 77 time 1 pv g8f8
info depth 78
info score cp 0 depth 78 time 1 pv g8f8
info depth 79
info score cp 0 depth 79 time 1 pv g8f8
info depth 80
info score cp 0 depth 80 time 1 pv g8f8
info depth 81
info score cp 0 depth 81 time 1 pv g8f8
info depth 82
info score cp 0 depth 82 time 1 pv g8f8
info depth 83
info score cp 0 depth 83 time 1 pv g8f8
info depth 84
info score cp 0 depth 84 time 1 pv g8f8
info depth 85
info score cp 0 depth 85 time 1 pv g8f8
info depth 86
info score cp 0 depth 86 time 1 pv g8f8
info depth 87
info score cp 0 depth 87 time 1 pv g8f8
info depth 88
info score cp 0 depth 88 time 1 pv g8f8
info depth 89
info score cp 0 depth 89 time 1 pv g8f8
info depth 90
info score cp 0 depth 90 time 1 pv g8f8
info depth 91
info score cp 0 depth 91 time 1 pv g8f8
info depth 92
info score cp 0 depth 92 time 1 pv g8f8
info depth 93
info score cp 0 depth 93 time 1 pv g8f8
info depth 94
info score cp 0 depth 94 time 1 pv g8f8
info depth 95
info score cp 0 depth 95 time 1 pv g8f8
info depth 96
info score cp 0 depth 96 time 1 pv g8f8
info depth 97
info score cp 0 depth 97 time 1 pv g8f8
info depth 98
info score cp 0 depth 98 time 1 pv g8f8
info depth 99
info score cp 0 depth 99 time 1 pv g8f8
info depth 100
info score cp 0 depth 100 time 2 pv g8f8
info depth 101
info score cp 0 depth 101 time 2 pv g8f8
info depth 102
info score cp 0 depth 102 time 2 pv g8f8
info depth 103
info score cp 0 depth 103 time 2 pv g8f8
info depth 104
info score cp 0 depth 104 time 2 pv g8f8
info depth 105
info score cp 0 depth 105 time 2 pv g8f8
info depth 106
info score cp 0 depth 106 time 2 pv g8f8
info depth 107
info score cp 0 depth 107 time 2 pv g8f8
info depth 108
info score cp 0 depth 108 time 2 pv g8f8
info depth 109
info score cp 0 depth 109 time 2 pv g8f8
info depth 110
info score cp 0 depth 110 time 2 pv g8f8
info depth 111
info score cp 0 depth 111 time 2 pv g8f8
info depth 112
info score cp 0 depth 112 time 2 pv g8f8
info depth 113
info score cp 0 depth 113 time 2 pv g8f8
info depth 114
info score cp 0 depth 114 time 2 pv g8f8
info depth 115
zsh: segmentation fault  ./chess2

engine dies

https://lichess.org/pBDcswi6/black#99

                    DEBUG    <UciProtocol (pid=2701)>: >> info score cp 0 depth 116 time 1 pv h8g8                                engine.py:1049
                    DEBUG    <UciProtocol (pid=2701)>: >> info depth 117                                                          engine.py:1049
                    DEBUG    <UciProtocol (pid=2701)>: >> info score cp 0 depth 117 time 1 pv h8g8                                engine.py:1049
                    DEBUG    <UciProtocol (pid=2701)>: >> info depth 118                                                          engine.py:1049
                    DEBUG    <UciProtocol (pid=2701)>: >> info score cp 0 depth 118 time 1 pv h8g8                                engine.py:1049
                    DEBUG    <UciProtocol (pid=2701)>: >> info depth 119                                                          engine.py:1049
                    DEBUG    <UciProtocol (pid=2701)>: >> info score cp 0 depth 119 time 1 pv h8g8                                engine.py:1049
                    DEBUG    <UciProtocol (pid=2701)>: Process exited                                                             engine.py:1020
                    DEBUG    <UciProtocol (pid=2701)>: Connection lost (exit code: -11, error: None)                              engine.py:1007
                    ERROR    Giving up play_game(...) after 2 tries (chess.engine.EngineTerminatedError: engine process died      _common.py:120

while trying 8/8/8/1B6/6p1/8/4KPpp/3N2kr w - - 0 1 which is a difficult for engines #11 after ply 4 memory corruption showed up in the PV. Reproducible at depth 1 from fen 8/8/8/1B6/8/4N1P1/4K1pp/6kr b - - 0 2 (which is stalemate).

position fen 8/8/8/1B6/8/4N1P1/4K1pp/6kr b - - 0 2
go depth 1
info depth 1
info score cp 0 depth 1 time 0 pv h1h1B
bestmove h1h1B
go perft 1
 0

engine blundered

https://lichess.org/a90WYaNv/black#96

Engine dies during search

position fen 2rqkb1r/3n2pp/4R3/1N6/3Q1BP1/P4b2/1PP4P/2KR4 b k - 0 20
go depth 12
info depth 1
info score cp -120 depth 1 time 1 pv e8f7
info depth 2
info score cp -25 depth 2 time 7 pv e8f7 d1e1
info depth 3
info score cp -25 depth 3 time 12 pv e8f7 d1e1 f3g4
info depth 4
info score cp -25 depth 4 time 22 pv e8f7 d1e1 f3g4 b5d6
info depth 5
info score cp -10 depth 5 time 40 pv e8f7 d1e1 f3g4 b5d6 f7g8
info depth 6
info score cp -10 depth 6 time 84 pv e8f7 d1e1 f3g4 b5d6 f7g8 d6c8
info depth 7
info score cp -45 depth 7 time 181 pv e8f7 e6e1 f3g4 d4d5 f7g6
info depth 8
info score cp -235 depth 8 time 338 pv e8f7 e6e1 f3g4 d4d5 f7g6 e1g1 f8a3
info depth 9
info score cp -250 depth 9 time 781 pv e8f7 e6e1 f8e7 d4d7 f3d1 d7e6 f7f8
info depth 10
info score cp -235 depth 10 time 1976 pv e8f7 e6e1 f3g4 d4d5 f7g6 e1g1 f8a3
info depth 11

engine exits here.

engine blundered

https://lichess.org/DoHzih7d/black#135

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