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Lots of issue about position fen and go command #5131

Closed
winapiadmin opened this issue Mar 22, 2024 · 6 comments · May be fixed by #4563
Closed

Lots of issue about position fen and go command #5131

winapiadmin opened this issue Mar 22, 2024 · 6 comments · May be fixed by #4563

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@winapiadmin
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Describe the issue

  • Stockfish doesn't crash when input an invalid FEN
  • d command shows information about tablebases at that position
  • No pieces, but go command still show bestmove a1a2 ponder a1b1

Expected behavior

Expected: crashes

Steps to reproduce

Stockfish 16.1 by the Stockfish developers (see AUTHORS file)
position fen 1
d

 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 8
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 7
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 6
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 5
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 4
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 3
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 2
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 1
 +---+---+---+---+---+---+---+---+
   a   b   c   d   e   f   g   h

Fen: 8/8/8/8/8/8/8/8 b - - 0 1
Key: C71D7EE069325455
Checkers:
Tablebases WDL:    0 (0)
Tablebases DTZ:    0 (0)
go
info string NNUE evaluation using nn-baff1ede1f90.nnue
info string NNUE evaluation using nn-b1a57edbea57.nnue
info depth 1 seldepth 2 multipv 1 score cp -796 nodes 2 nps 24 hashfull 0 tbhits 0 time 81 pv a1a2
info depth 2 seldepth 2 multipv 1 score cp -796 nodes 5 nps 60 hashfull 0 tbhits 0 time 82 pv a1a2
info depth 3 seldepth 2 multipv 1 score cp -796 nodes 13 nps 156 hashfull 0 tbhits 0 time 83 pv a1a2
info depth 4 seldepth 2 multipv 1 score cp -796 nodes 13 nps 154 hashfull 0 tbhits 0 time 84 pv a1a2
info depth 5 seldepth 2 multipv 1 score cp -796 nodes 13 nps 154 hashfull 0 tbhits 0 time 84 pv a1a2
info depth 6 seldepth 2 multipv 1 score cp -796 nodes 13 nps 152 hashfull 0 tbhits 0 time 85 pv a1a2
info depth 7 seldepth 2 multipv 1 score cp -796 nodes 13 nps 151 hashfull 0 tbhits 0 time 86 pv a1a2
info depth 8 seldepth 2 multipv 1 score cp -796 nodes 13 nps 151 hashfull 0 tbhits 0 time 86 pv a1a2
info depth 9 seldepth 2 multipv 1 score cp -796 nodes 13 nps 149 hashfull 0 tbhits 0 time 87 pv a1a2
info depth 10 seldepth 2 multipv 1 score cp -796 nodes 13 nps 147 hashfull 0 tbhits 0 time 88 pv a1a2
info depth 11 seldepth 2 multipv 1 score cp -796 nodes 13 nps 147 hashfull 0 tbhits 0 time 88 pv a1a2
info depth 12 seldepth 2 multipv 1 score cp -796 nodes 13 nps 146 hashfull 0 tbhits 0 time 89 pv a1a2
info depth 13 seldepth 2 multipv 1 score cp -796 nodes 13 nps 146 hashfull 0 tbhits 0 time 89 pv a1a2
info depth 14 seldepth 2 multipv 1 score cp -796 nodes 13 nps 144 hashfull 0 tbhits 0 time 90 pv a1a2
info depth 15 seldepth 2 multipv 1 score cp -796 nodes 13 nps 142 hashfull 0 tbhits 0 time 91 pv a1a2
info depth 16 seldepth 2 multipv 1 score cp -796 nodes 13 nps 142 hashfull 0 tbhits 0 time 91 pv a1a2
info depth 17 seldepth 2 multipv 1 score cp -796 nodes 13 nps 141 hashfull 0 tbhits 0 time 92 pv a1a2
info depth 18 seldepth 2 multipv 1 score cp -796 nodes 13 nps 141 hashfull 0 tbhits 0 time 92 pv a1a2
info depth 19 seldepth 2 multipv 1 score cp -796 nodes 13 nps 139 hashfull 0 tbhits 0 time 93 pv a1a2
info depth 20 seldepth 2 multipv 1 score cp -796 nodes 13 nps 138 hashfull 0 tbhits 0 time 94 pv a1a2
info depth 21 seldepth 2 multipv 1 score cp -796 nodes 13 nps 138 hashfull 0 tbhits 0 time 94 pv a1a2
info depth 22 seldepth 2 multipv 1 score cp -796 nodes 13 nps 136 hashfull 0 tbhits 0 time 95 pv a1a2
info depth 23 seldepth 2 multipv 1 score cp -796 nodes 13 nps 135 hashfull 0 tbhits 0 time 96 pv a1a2
info depth 24 seldepth 2 multipv 1 score cp -796 nodes 13 nps 135 hashfull 0 tbhits 0 time 96 pv a1a2
info depth 25 seldepth 2 multipv 1 score cp -796 nodes 13 nps 134 hashfull 0 tbhits 0 time 97 pv a1a2
info depth 26 seldepth 2 multipv 1 score cp -796 nodes 13 nps 132 hashfull 0 tbhits 0 time 98 pv a1a2
info depth 27 seldepth 2 multipv 1 score cp -796 nodes 13 nps 132 hashfull 0 tbhits 0 time 98 pv a1a2
info depth 28 seldepth 2 multipv 1 score cp -796 nodes 13 nps 131 hashfull 0 tbhits 0 time 99 pv a1a2
info depth 29 seldepth 2 multipv 1 score cp -796 nodes 13 nps 131 hashfull 0 tbhits 0 time 99 pv a1a2
info depth 30 seldepth 2 multipv 1 score cp -796 nodes 13 nps 130 hashfull 0 tbhits 0 time 100 pv a1a2
info depth 31 seldepth 2 multipv 1 score cp -796 nodes 13 nps 128 hashfull 0 tbhits 0 time 101 pv a1a2
info depth 32 seldepth 2 multipv 1 score cp -796 nodes 13 nps 128 hashfull 0 tbhits 0 time 101 pv a1a2
info depth 33 seldepth 2 multipv 1 score cp -796 nodes 13 nps 127 hashfull 0 tbhits 0 time 102 pv a1a2
info depth 34 seldepth 2 multipv 1 score cp -796 nodes 13 nps 122 hashfull 0 tbhits 0 time 106 pv a1a2
info depth 35 seldepth 2 multipv 1 score cp -796 nodes 13 nps 121 hashfull 0 tbhits 0 time 107 pv a1a2
info depth 36 seldepth 2 multipv 1 score cp -796 nodes 13 nps 120 hashfull 0 tbhits 0 time 108 pv a1a2
info depth 37 seldepth 2 multipv 1 score cp -796 nodes 13 nps 119 hashfull 0 tbhits 0 time 109 pv a1a2
info depth 38 seldepth 2 multipv 1 score cp -796 nodes 13 nps 119 hashfull 0 tbhits 0 time 109 pv a1a2
info depth 39 seldepth 2 multipv 1 score cp -796 nodes 13 nps 118 hashfull 0 tbhits 0 time 110 pv a1a2
info depth 40 seldepth 2 multipv 1 score cp -796 nodes 13 nps 117 hashfull 0 tbhits 0 time 111 pv a1a2
info depth 41 seldepth 2 multipv 1 score cp -796 nodes 13 nps 117 hashfull 0 tbhits 0 time 111 pv a1a2
info depth 42 seldepth 2 multipv 1 score cp -796 nodes 13 nps 116 hashfull 0 tbhits 0 time 112 pv a1a2
info depth 43 seldepth 2 multipv 1 score cp -796 nodes 13 nps 115 hashfull 0 tbhits 0 time 113 pv a1a2
info depth 44 seldepth 2 multipv 1 score cp -796 nodes 13 nps 114 hashfull 0 tbhits 0 time 114 pv a1a2
info depth 45 seldepth 2 multipv 1 score cp -796 nodes 13 nps 114 hashfull 0 tbhits 0 time 114 pv a1a2
info depth 46 seldepth 2 multipv 1 score cp -796 nodes 13 nps 113 hashfull 0 tbhits 0 time 115 pv a1a2
info depth 47 seldepth 2 multipv 1 score cp -796 nodes 13 nps 112 hashfull 0 tbhits 0 time 116 pv a1a2
info depth 48 seldepth 2 multipv 1 score cp -796 nodes 13 nps 112 hashfull 0 tbhits 0 time 116 pv a1a2
info depth 49 seldepth 2 multipv 1 score cp -796 nodes 13 nps 111 hashfull 0 tbhits 0 time 117 pv a1a2
info depth 50 seldepth 2 multipv 1 score cp -796 nodes 13 nps 111 hashfull 0 tbhits 0 time 117 pv a1a2
info depth 51 seldepth 2 multipv 1 score cp -796 nodes 13 nps 108 hashfull 0 tbhits 0 time 120 pv a1a2
info depth 52 seldepth 2 multipv 1 score cp -796 nodes 13 nps 107 hashfull 0 tbhits 0 time 121 pv a1a2
info depth 53 seldepth 2 multipv 1 score cp -796 nodes 13 nps 107 hashfull 0 tbhits 0 time 121 pv a1a2
info depth 54 seldepth 2 multipv 1 score cp -796 nodes 13 nps 106 hashfull 0 tbhits 0 time 122 pv a1a2
info depth 55 seldepth 2 multipv 1 score cp -796 nodes 13 nps 106 hashfull 0 tbhits 0 time 122 pv a1a2
info depth 56 seldepth 2 multipv 1 score cp -796 nodes 13 nps 105 hashfull 0 tbhits 0 time 123 pv a1a2
info depth 57 seldepth 2 multipv 1 score cp -796 nodes 13 nps 104 hashfull 0 tbhits 0 time 124 pv a1a2
info depth 58 seldepth 2 multipv 1 score cp -796 nodes 13 nps 104 hashfull 0 tbhits 0 time 124 pv a1a2
info depth 59 seldepth 2 multipv 1 score cp -796 nodes 13 nps 104 hashfull 0 tbhits 0 time 125 pv a1a2
info depth 60 seldepth 2 multipv 1 score cp -796 nodes 13 nps 104 hashfull 0 tbhits 0 time 125 pv a1a2
info depth 61 seldepth 2 multipv 1 score cp -796 nodes 13 nps 103 hashfull 0 tbhits 0 time 126 pv a1a2
info depth 62 seldepth 2 multipv 1 score cp -796 nodes 13 nps 102 hashfull 0 tbhits 0 time 127 pv a1a2
info depth 63 seldepth 2 multipv 1 score cp -796 nodes 13 nps 102 hashfull 0 tbhits 0 time 127 pv a1a2
info depth 64 seldepth 2 multipv 1 score cp -796 nodes 13 nps 101 hashfull 0 tbhits 0 time 128 pv a1a2
info depth 65 seldepth 2 multipv 1 score cp -796 nodes 13 nps 100 hashfull 0 tbhits 0 time 129 pv a1a2
info depth 66 seldepth 2 multipv 1 score cp -796 nodes 13 nps 100 hashfull 0 tbhits 0 time 130 pv a1a2
info depth 67 seldepth 2 multipv 1 score cp -796 nodes 13 nps 99 hashfull 0 tbhits 0 time 131 pv a1a2
info depth 68 seldepth 2 multipv 1 score cp -796 nodes 13 nps 98 hashfull 0 tbhits 0 time 132 pv a1a2
info depth 69 seldepth 2 multipv 1 score cp -796 nodes 13 nps 97 hashfull 0 tbhits 0 time 133 pv a1a2
info depth 70 seldepth 2 multipv 1 score cp -796 nodes 13 nps 97 hashfull 0 tbhits 0 time 133 pv a1a2
info depth 71 seldepth 2 multipv 1 score cp -796 nodes 13 nps 95 hashfull 0 tbhits 0 time 136 pv a1a2
info depth 72 seldepth 2 multipv 1 score cp -796 nodes 13 nps 94 hashfull 0 tbhits 0 time 137 pv a1a2
info depth 73 seldepth 2 multipv 1 score cp -796 nodes 13 nps 94 hashfull 0 tbhits 0 time 138 pv a1a2
info depth 74 seldepth 2 multipv 1 score cp -796 nodes 13 nps 93 hashfull 0 tbhits 0 time 139 pv a1a2
info depth 75 seldepth 2 multipv 1 score cp -796 nodes 13 nps 93 hashfull 0 tbhits 0 time 139 pv a1a2
info depth 76 seldepth 2 multipv 1 score cp -796 nodes 13 nps 92 hashfull 0 tbhits 0 time 140 pv a1a2
info depth 77 seldepth 2 multipv 1 score cp -796 nodes 13 nps 92 hashfull 0 tbhits 0 time 141 pv a1a2
info depth 78 seldepth 2 multipv 1 score cp -796 nodes 13 nps 92 hashfull 0 tbhits 0 time 141 pv a1a2
info depth 79 seldepth 2 multipv 1 score cp -796 nodes 13 nps 91 hashfull 0 tbhits 0 time 142 pv a1a2
info depth 80 seldepth 2 multipv 1 score cp -796 nodes 13 nps 91 hashfull 0 tbhits 0 time 142 pv a1a2
info depth 81 seldepth 2 multipv 1 score cp -796 nodes 13 nps 90 hashfull 0 tbhits 0 time 143 pv a1a2
info depth 82 seldepth 2 multipv 1 score cp -796 nodes 13 nps 90 hashfull 0 tbhits 0 time 144 pv a1a2
info depth 83 seldepth 2 multipv 1 score cp -796 nodes 13 nps 90 hashfull 0 tbhits 0 time 144 pv a1a2
info depth 84 seldepth 2 multipv 1 score cp -796 nodes 13 nps 89 hashfull 0 tbhits 0 time 145 pv a1a2
info depth 85 seldepth 2 multipv 1 score cp -796 nodes 13 nps 89 hashfull 0 tbhits 0 time 146 pv a1a2
info depth 86 seldepth 2 multipv 1 score cp -796 nodes 13 nps 88 hashfull 0 tbhits 0 time 147 pv a1a2
info depth 87 seldepth 2 multipv 1 score cp -796 nodes 13 nps 87 hashfull 0 tbhits 0 time 148 pv a1a2
info depth 88 seldepth 2 multipv 1 score cp -796 nodes 13 nps 87 hashfull 0 tbhits 0 time 148 pv a1a2
info depth 89 seldepth 2 multipv 1 score cp -796 nodes 13 nps 87 hashfull 0 tbhits 0 time 149 pv a1a2
info depth 90 seldepth 2 multipv 1 score cp -796 nodes 13 nps 85 hashfull 0 tbhits 0 time 152 pv a1a2
info depth 91 seldepth 2 multipv 1 score cp -796 nodes 13 nps 85 hashfull 0 tbhits 0 time 152 pv a1a2
info depth 92 seldepth 2 multipv 1 score cp -796 nodes 13 nps 84 hashfull 0 tbhits 0 time 153 pv a1a2
info depth 93 seldepth 2 multipv 1 score cp -796 nodes 13 nps 84 hashfull 0 tbhits 0 time 154 pv a1a2
info depth 94 seldepth 2 multipv 1 score cp -796 nodes 13 nps 84 hashfull 0 tbhits 0 time 154 pv a1a2
info depth 95 seldepth 2 multipv 1 score cp -796 nodes 13 nps 83 hashfull 0 tbhits 0 time 155 pv a1a2
info depth 96 seldepth 2 multipv 1 score cp -796 nodes 13 nps 83 hashfull 0 tbhits 0 time 156 pv a1a2
info depth 97 seldepth 2 multipv 1 score cp -796 nodes 13 nps 83 hashfull 0 tbhits 0 time 156 pv a1a2
info depth 98 seldepth 2 multipv 1 score cp -796 nodes 13 nps 82 hashfull 0 tbhits 0 time 157 pv a1a2
info depth 99 seldepth 2 multipv 1 score cp -796 nodes 13 nps 82 hashfull 0 tbhits 0 time 157 pv a1a2
info depth 100 seldepth 2 multipv 1 score cp -796 nodes 13 nps 82 hashfull 0 tbhits 0 time 158 pv a1a2
info depth 101 seldepth 2 multipv 1 score cp -796 nodes 13 nps 81 hashfull 0 tbhits 0 time 159 pv a1a2
info depth 102 seldepth 2 multipv 1 score cp -796 nodes 13 nps 81 hashfull 0 tbhits 0 time 159 pv a1a2
info depth 103 seldepth 2 multipv 1 score cp -796 nodes 13 nps 81 hashfull 0 tbhits 0 time 160 pv a1a2
info depth 104 seldepth 2 multipv 1 score cp -796 nodes 13 nps 81 hashfull 0 tbhits 0 time 160 pv a1a2
info depth 105 seldepth 2 multipv 1 score cp -796 nodes 13 nps 80 hashfull 0 tbhits 0 time 161 pv a1a2
info depth 106 seldepth 2 multipv 1 score cp -796 nodes 13 nps 80 hashfull 0 tbhits 0 time 162 pv a1a2
info depth 107 seldepth 2 multipv 1 score cp -796 nodes 13 nps 79 hashfull 0 tbhits 0 time 163 pv a1a2
info depth 108 seldepth 2 multipv 1 score cp -796 nodes 13 nps 79 hashfull 0 tbhits 0 time 164 pv a1a2
info depth 109 seldepth 2 multipv 1 score cp -796 nodes 13 nps 79 hashfull 0 tbhits 0 time 164 pv a1a2
info depth 110 seldepth 2 multipv 1 score cp -796 nodes 13 nps 77 hashfull 0 tbhits 0 time 167 pv a1a2
info depth 111 seldepth 2 multipv 1 score cp -796 nodes 13 nps 77 hashfull 0 tbhits 0 time 168 pv a1a2
info depth 112 seldepth 2 multipv 1 score cp -796 nodes 13 nps 76 hashfull 0 tbhits 0 time 169 pv a1a2
info depth 113 seldepth 2 multipv 1 score cp -796 nodes 13 nps 76 hashfull 0 tbhits 0 time 170 pv a1a2
info depth 114 seldepth 2 multipv 1 score cp -796 nodes 13 nps 76 hashfull 0 tbhits 0 time 170 pv a1a2
info depth 115 seldepth 2 multipv 1 score cp -796 nodes 13 nps 76 hashfull 0 tbhits 0 time 171 pv a1a2
info depth 116 seldepth 2 multipv 1 score cp -796 nodes 13 nps 75 hashfull 0 tbhits 0 time 172 pv a1a2
info depth 117 seldepth 2 multipv 1 score cp -796 nodes 13 nps 75 hashfull 0 tbhits 0 time 172 pv a1a2
info depth 118 seldepth 2 multipv 1 score cp -796 nodes 13 nps 75 hashfull 0 tbhits 0 time 173 pv a1a2
info depth 119 seldepth 2 multipv 1 score cp -796 nodes 13 nps 74 hashfull 0 tbhits 0 time 174 pv a1a2
info depth 120 seldepth 2 multipv 1 score cp -796 nodes 13 nps 74 hashfull 0 tbhits 0 time 174 pv a1a2
info depth 121 seldepth 2 multipv 1 score cp -796 nodes 13 nps 74 hashfull 0 tbhits 0 time 175 pv a1a2
info depth 122 seldepth 2 multipv 1 score cp -796 nodes 13 nps 73 hashfull 0 tbhits 0 time 176 pv a1a2
info depth 123 seldepth 2 multipv 1 score cp -796 nodes 13 nps 73 hashfull 0 tbhits 0 time 176 pv a1a2
info depth 124 seldepth 2 multipv 1 score cp -796 nodes 13 nps 73 hashfull 0 tbhits 0 time 177 pv a1a2
info depth 125 seldepth 2 multipv 1 score cp -796 nodes 13 nps 73 hashfull 0 tbhits 0 time 178 pv a1a2
info depth 126 seldepth 2 multipv 1 score cp -796 nodes 13 nps 73 hashfull 0 tbhits 0 time 178 pv a1a2
info depth 127 seldepth 2 multipv 1 score cp -796 nodes 13 nps 72 hashfull 0 tbhits 0 time 179 pv a1a2
info depth 128 seldepth 2 multipv 1 score cp -796 nodes 13 nps 72 hashfull 0 tbhits 0 time 180 pv a1a2
info depth 129 seldepth 2 multipv 1 score cp -796 nodes 13 nps 71 hashfull 0 tbhits 0 time 183 pv a1a2
info depth 130 seldepth 2 multipv 1 score cp -796 nodes 13 nps 70 hashfull 0 tbhits 0 time 184 pv a1a2
info depth 131 seldepth 2 multipv 1 score cp -796 nodes 13 nps 70 hashfull 0 tbhits 0 time 185 pv a1a2
info depth 132 seldepth 2 multipv 1 score cp -796 nodes 13 nps 69 hashfull 0 tbhits 0 time 186 pv a1a2
info depth 133 seldepth 2 multipv 1 score cp -796 nodes 13 nps 69 hashfull 0 tbhits 0 time 186 pv a1a2
info depth 134 seldepth 2 multipv 1 score cp -796 nodes 13 nps 69 hashfull 0 tbhits 0 time 187 pv a1a2
info depth 135 seldepth 2 multipv 1 score cp -796 nodes 13 nps 69 hashfull 0 tbhits 0 time 187 pv a1a2
info depth 136 seldepth 2 multipv 1 score cp -796 nodes 13 nps 69 hashfull 0 tbhits 0 time 188 pv a1a2
info depth 137 seldepth 2 multipv 1 score cp -796 nodes 13 nps 68 hashfull 0 tbhits 0 time 189 pv a1a2
info depth 138 seldepth 2 multipv 1 score cp -796 nodes 13 nps 68 hashfull 0 tbhits 0 time 189 pv a1a2
info depth 139 seldepth 2 multipv 1 score cp -796 nodes 13 nps 68 hashfull 0 tbhits 0 time 190 pv a1a2
info depth 140 seldepth 2 multipv 1 score cp -796 nodes 13 nps 68 hashfull 0 tbhits 0 time 191 pv a1a2
info depth 141 seldepth 2 multipv 1 score cp -796 nodes 13 nps 68 hashfull 0 tbhits 0 time 191 pv a1a2
info depth 142 seldepth 2 multipv 1 score cp -796 nodes 13 nps 67 hashfull 0 tbhits 0 time 192 pv a1a2
info depth 143 seldepth 2 multipv 1 score cp -796 nodes 13 nps 67 hashfull 0 tbhits 0 time 192 pv a1a2
info depth 144 seldepth 2 multipv 1 score cp -796 nodes 13 nps 67 hashfull 0 tbhits 0 time 193 pv a1a2
info depth 145 seldepth 2 multipv 1 score cp -796 nodes 13 nps 67 hashfull 0 tbhits 0 time 194 pv a1a2
info depth 146 seldepth 2 multipv 1 score cp -796 nodes 13 nps 67 hashfull 0 tbhits 0 time 194 pv a1a2
info depth 147 seldepth 2 multipv 1 score cp -796 nodes 13 nps 66 hashfull 0 tbhits 0 time 195 pv a1a2
info depth 148 seldepth 2 multipv 1 score cp -796 nodes 13 nps 66 hashfull 0 tbhits 0 time 196 pv a1a2
info depth 149 seldepth 2 multipv 1 score cp -796 nodes 13 nps 65 hashfull 0 tbhits 0 time 200 pv a1a2
info depth 150 seldepth 2 multipv 1 score cp -796 nodes 13 nps 64 hashfull 0 tbhits 0 time 201 pv a1a2
info depth 151 seldepth 2 multipv 1 score cp -796 nodes 13 nps 64 hashfull 0 tbhits 0 time 202 pv a1a2
info depth 152 seldepth 2 multipv 1 score cp -796 nodes 13 nps 64 hashfull 0 tbhits 0 time 202 pv a1a2
info depth 153 seldepth 2 multipv 1 score cp -796 nodes 13 nps 64 hashfull 0 tbhits 0 time 203 pv a1a2
info depth 154 seldepth 2 multipv 1 score cp -796 nodes 13 nps 63 hashfull 0 tbhits 0 time 204 pv a1a2
info depth 155 seldepth 2 multipv 1 score cp -796 nodes 13 nps 63 hashfull 0 tbhits 0 time 204 pv a1a2
info depth 156 seldepth 2 multipv 1 score cp -796 nodes 13 nps 63 hashfull 0 tbhits 0 time 205 pv a1a2
info depth 157 seldepth 2 multipv 1 score cp -796 nodes 13 nps 63 hashfull 0 tbhits 0 time 206 pv a1a2
info depth 158 seldepth 2 multipv 1 score cp -796 nodes 13 nps 63 hashfull 0 tbhits 0 time 206 pv a1a2
info depth 159 seldepth 2 multipv 1 score cp -796 nodes 13 nps 62 hashfull 0 tbhits 0 time 207 pv a1a2
info depth 160 seldepth 2 multipv 1 score cp -796 nodes 13 nps 62 hashfull 0 tbhits 0 time 207 pv a1a2
info depth 161 seldepth 2 multipv 1 score cp -796 nodes 13 nps 62 hashfull 0 tbhits 0 time 208 pv a1a2
info depth 162 seldepth 2 multipv 1 score cp -796 nodes 13 nps 62 hashfull 0 tbhits 0 time 209 pv a1a2
info depth 163 seldepth 2 multipv 1 score cp -796 nodes 13 nps 62 hashfull 0 tbhits 0 time 209 pv a1a2
info depth 164 seldepth 2 multipv 1 score cp -796 nodes 13 nps 61 hashfull 0 tbhits 0 time 210 pv a1a2
info depth 165 seldepth 2 multipv 1 score cp -796 nodes 13 nps 61 hashfull 0 tbhits 0 time 210 pv a1a2
info depth 166 seldepth 2 multipv 1 score cp -796 nodes 13 nps 61 hashfull 0 tbhits 0 time 211 pv a1a2
info depth 167 seldepth 2 multipv 1 score cp -796 nodes 13 nps 60 hashfull 0 tbhits 0 time 215 pv a1a2
info depth 168 seldepth 2 multipv 1 score cp -796 nodes 13 nps 60 hashfull 0 tbhits 0 time 216 pv a1a2
info depth 169 seldepth 2 multipv 1 score cp -796 nodes 13 nps 59 hashfull 0 tbhits 0 time 217 pv a1a2
info depth 170 seldepth 2 multipv 1 score cp -796 nodes 13 nps 59 hashfull 0 tbhits 0 time 218 pv a1a2
info depth 171 seldepth 2 multipv 1 score cp -796 nodes 13 nps 59 hashfull 0 tbhits 0 time 219 pv a1a2
info depth 172 seldepth 2 multipv 1 score cp -796 nodes 13 nps 59 hashfull 0 tbhits 0 time 219 pv a1a2
info depth 173 seldepth 2 multipv 1 score cp -796 nodes 13 nps 59 hashfull 0 tbhits 0 time 220 pv a1a2
info depth 174 seldepth 2 multipv 1 score cp -796 nodes 13 nps 58 hashfull 0 tbhits 0 time 221 pv a1a2
info depth 175 seldepth 2 multipv 1 score cp -796 nodes 13 nps 58 hashfull 0 tbhits 0 time 221 pv a1a2
info depth 176 seldepth 2 multipv 1 score cp -796 nodes 13 nps 58 hashfull 0 tbhits 0 time 222 pv a1a2
info depth 177 seldepth 2 multipv 1 score cp -796 nodes 13 nps 58 hashfull 0 tbhits 0 time 222 pv a1a2
info depth 178 seldepth 2 multipv 1 score cp -796 nodes 13 nps 58 hashfull 0 tbhits 0 time 223 pv a1a2
info depth 179 seldepth 2 multipv 1 score cp -796 nodes 13 nps 58 hashfull 0 tbhits 0 time 224 pv a1a2
info depth 180 seldepth 2 multipv 1 score cp -796 nodes 13 nps 58 hashfull 0 tbhits 0 time 224 pv a1a2
info depth 181 seldepth 2 multipv 1 score cp -796 nodes 13 nps 57 hashfull 0 tbhits 0 time 225 pv a1a2
info depth 182 seldepth 2 multipv 1 score cp -796 nodes 13 nps 57 hashfull 0 tbhits 0 time 226 pv a1a2
info depth 183 seldepth 2 multipv 1 score cp -796 nodes 13 nps 57 hashfull 0 tbhits 0 time 226 pv a1a2
info depth 184 seldepth 2 multipv 1 score cp -796 nodes 13 nps 57 hashfull 0 tbhits 0 time 227 pv a1a2
info depth 185 seldepth 2 multipv 1 score cp -796 nodes 13 nps 56 hashfull 0 tbhits 0 time 230 pv a1a2
info depth 186 seldepth 2 multipv 1 score cp -796 nodes 13 nps 56 hashfull 0 tbhits 0 time 231 pv a1a2
info depth 187 seldepth 2 multipv 1 score cp -796 nodes 13 nps 56 hashfull 0 tbhits 0 time 232 pv a1a2
info depth 188 seldepth 2 multipv 1 score cp -796 nodes 13 nps 55 hashfull 0 tbhits 0 time 233 pv a1a2
info depth 189 seldepth 2 multipv 1 score cp -796 nodes 13 nps 55 hashfull 0 tbhits 0 time 233 pv a1a2
info depth 190 seldepth 2 multipv 1 score cp -796 nodes 13 nps 55 hashfull 0 tbhits 0 time 234 pv a1a2
info depth 191 seldepth 2 multipv 1 score cp -796 nodes 13 nps 55 hashfull 0 tbhits 0 time 235 pv a1a2
info depth 192 seldepth 2 multipv 1 score cp -796 nodes 13 nps 55 hashfull 0 tbhits 0 time 235 pv a1a2
info depth 193 seldepth 2 multipv 1 score cp -796 nodes 13 nps 55 hashfull 0 tbhits 0 time 236 pv a1a2
info depth 194 seldepth 2 multipv 1 score cp -796 nodes 13 nps 54 hashfull 0 tbhits 0 time 237 pv a1a2
info depth 195 seldepth 2 multipv 1 score cp -796 nodes 13 nps 54 hashfull 0 tbhits 0 time 238 pv a1a2
info depth 196 seldepth 2 multipv 1 score cp -796 nodes 13 nps 54 hashfull 0 tbhits 0 time 238 pv a1a2
info depth 197 seldepth 2 multipv 1 score cp -796 nodes 13 nps 54 hashfull 0 tbhits 0 time 239 pv a1a2
info depth 198 seldepth 2 multipv 1 score cp -796 nodes 13 nps 54 hashfull 0 tbhits 0 time 240 pv a1a2
info depth 199 seldepth 2 multipv 1 score cp -796 nodes 13 nps 54 hashfull 0 tbhits 0 time 240 pv a1a2
info depth 200 seldepth 2 multipv 1 score cp -796 nodes 13 nps 53 hashfull 0 tbhits 0 time 241 pv a1a2
info depth 201 seldepth 2 multipv 1 score cp -796 nodes 13 nps 53 hashfull 0 tbhits 0 time 242 pv a1a2
info depth 202 seldepth 2 multipv 1 score cp -796 nodes 13 nps 53 hashfull 0 tbhits 0 time 242 pv a1a2
info depth 203 seldepth 2 multipv 1 score cp -796 nodes 13 nps 53 hashfull 0 tbhits 0 time 243 pv a1a2
info depth 204 seldepth 2 multipv 1 score cp -796 nodes 13 nps 52 hashfull 0 tbhits 0 time 246 pv a1a2
info depth 205 seldepth 2 multipv 1 score cp -796 nodes 13 nps 52 hashfull 0 tbhits 0 time 247 pv a1a2
info depth 206 seldepth 2 multipv 1 score cp -796 nodes 13 nps 52 hashfull 0 tbhits 0 time 248 pv a1a2
info depth 207 seldepth 2 multipv 1 score cp -796 nodes 13 nps 52 hashfull 0 tbhits 0 time 249 pv a1a2
info depth 208 seldepth 2 multipv 1 score cp -796 nodes 13 nps 52 hashfull 0 tbhits 0 time 249 pv a1a2
info depth 209 seldepth 2 multipv 1 score cp -796 nodes 13 nps 52 hashfull 0 tbhits 0 time 250 pv a1a2
info depth 210 seldepth 2 multipv 1 score cp -796 nodes 13 nps 51 hashfull 0 tbhits 0 time 251 pv a1a2
info depth 211 seldepth 2 multipv 1 score cp -796 nodes 13 nps 51 hashfull 0 tbhits 0 time 251 pv a1a2
info depth 212 seldepth 2 multipv 1 score cp -796 nodes 13 nps 51 hashfull 0 tbhits 0 time 252 pv a1a2
info depth 213 seldepth 2 multipv 1 score cp -796 nodes 13 nps 51 hashfull 0 tbhits 0 time 252 pv a1a2
info depth 214 seldepth 2 multipv 1 score cp -796 nodes 13 nps 51 hashfull 0 tbhits 0 time 253 pv a1a2
info depth 215 seldepth 2 multipv 1 score cp -796 nodes 13 nps 51 hashfull 0 tbhits 0 time 254 pv a1a2
info depth 216 seldepth 2 multipv 1 score cp -796 nodes 13 nps 51 hashfull 0 tbhits 0 time 254 pv a1a2
info depth 217 seldepth 2 multipv 1 score cp -796 nodes 13 nps 50 hashfull 0 tbhits 0 time 255 pv a1a2
info depth 218 seldepth 2 multipv 1 score cp -796 nodes 13 nps 50 hashfull 0 tbhits 0 time 256 pv a1a2
info depth 219 seldepth 2 multipv 1 score cp -796 nodes 13 nps 50 hashfull 0 tbhits 0 time 256 pv a1a2
info depth 220 seldepth 2 multipv 1 score cp -796 nodes 13 nps 50 hashfull 0 tbhits 0 time 257 pv a1a2
info depth 221 seldepth 2 multipv 1 score cp -796 nodes 13 nps 50 hashfull 0 tbhits 0 time 257 pv a1a2
info depth 222 seldepth 2 multipv 1 score cp -796 nodes 13 nps 50 hashfull 0 tbhits 0 time 258 pv a1a2
info depth 223 seldepth 2 multipv 1 score cp -796 nodes 13 nps 50 hashfull 0 tbhits 0 time 260 pv a1a2
info depth 224 seldepth 2 multipv 1 score cp -796 nodes 13 nps 49 hashfull 0 tbhits 0 time 261 pv a1a2
info depth 225 seldepth 2 multipv 1 score cp -796 nodes 13 nps 49 hashfull 0 tbhits 0 time 262 pv a1a2
info depth 226 seldepth 2 multipv 1 score cp -796 nodes 13 nps 49 hashfull 0 tbhits 0 time 263 pv a1a2
info depth 227 seldepth 2 multipv 1 score cp -796 nodes 13 nps 49 hashfull 0 tbhits 0 time 265 pv a1a2
info depth 228 seldepth 2 multipv 1 score cp -796 nodes 13 nps 48 hashfull 0 tbhits 0 time 266 pv a1a2
info depth 229 seldepth 2 multipv 1 score cp -796 nodes 13 nps 48 hashfull 0 tbhits 0 time 266 pv a1a2
info depth 230 seldepth 2 multipv 1 score cp -796 nodes 13 nps 48 hashfull 0 tbhits 0 time 267 pv a1a2
info depth 231 seldepth 2 multipv 1 score cp -796 nodes 13 nps 48 hashfull 0 tbhits 0 time 267 pv a1a2
info depth 232 seldepth 2 multipv 1 score cp -796 nodes 13 nps 48 hashfull 0 tbhits 0 time 268 pv a1a2
info depth 233 seldepth 2 multipv 1 score cp -796 nodes 13 nps 48 hashfull 0 tbhits 0 time 269 pv a1a2
info depth 234 seldepth 2 multipv 1 score cp -796 nodes 13 nps 48 hashfull 0 tbhits 0 time 269 pv a1a2
info depth 235 seldepth 2 multipv 1 score cp -796 nodes 13 nps 48 hashfull 0 tbhits 0 time 270 pv a1a2
info depth 236 seldepth 2 multipv 1 score cp -796 nodes 13 nps 48 hashfull 0 tbhits 0 time 270 pv a1a2
info depth 237 seldepth 2 multipv 1 score cp -796 nodes 13 nps 47 hashfull 0 tbhits 0 time 271 pv a1a2
info depth 238 seldepth 2 multipv 1 score cp -796 nodes 13 nps 47 hashfull 0 tbhits 0 time 272 pv a1a2
info depth 239 seldepth 2 multipv 1 score cp -796 nodes 13 nps 47 hashfull 0 tbhits 0 time 272 pv a1a2
info depth 240 seldepth 2 multipv 1 score cp -796 nodes 13 nps 47 hashfull 0 tbhits 0 time 273 pv a1a2
info depth 241 seldepth 2 multipv 1 score cp -796 nodes 13 nps 47 hashfull 0 tbhits 0 time 273 pv a1a2
info depth 242 seldepth 2 multipv 1 score cp -796 nodes 13 nps 47 hashfull 0 tbhits 0 time 274 pv a1a2
info depth 243 seldepth 2 multipv 1 score cp -796 nodes 13 nps 46 hashfull 0 tbhits 0 time 277 pv a1a2
info depth 244 seldepth 2 multipv 1 score cp -796 nodes 13 nps 46 hashfull 0 tbhits 0 time 277 pv a1a2
info depth 245 seldepth 2 multipv 1 score cp -796 nodes 13 nps 46 hashfull 0 tbhits 0 time 278 pv a1a2
bestmove a1a2 ponder a1b1

Anything else?

Stockfish 16:

Stockfish 16 by the Stockfish developers (see AUTHORS file)
position fen 1
d

 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 8
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 7
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 6
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 5
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 4
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 3
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 2
 +---+---+---+---+---+---+---+---+
 |   |   |   |   |   |   |   |   | 1
 +---+---+---+---+---+---+---+---+
   a   b   c   d   e   f   g   h

Fen: 8/8/8/8/8/8/8/8 b - - 0 1
Key: C71D7EE069325455
Checkers:
Tablebases WDL: Draw (Failed)
Tablebases DTZ:    0 (Failed)
info string NNUE evaluation using nn-5af11540bbfe.nnue enabled
info depth 1 seldepth 1 multipv 1 score cp -161 nodes 2 nps 400 hashfull 0 tbhits 0 time 5 pv a1a2
info depth 2 seldepth 1 multipv 1 score cp -161 nodes 4 nps 666 hashfull 0 tbhits 0 time 6 pv a1a2
info depth 3 seldepth 1 multipv 1 score cp -161 nodes 5 nps 500 hashfull 0 tbhits 0 time 10 pv a1a2
info depth 4 seldepth 1 multipv 1 score cp -161 nodes 5 nps 454 hashfull 0 tbhits 0 time 11 pv a1a2
info depth 5 seldepth 1 multipv 1 score cp -161 nodes 5 nps 454 hashfull 0 tbhits 0 time 11 pv a1a2
info depth 6 seldepth 1 multipv 1 score cp -161 nodes 5 nps 384 hashfull 0 tbhits 0 time 13 pv a1a2
info depth 7 seldepth 1 multipv 1 score cp -161 nodes 5 nps 357 hashfull 0 tbhits 0 time 14 pv a1a2
info depth 8 seldepth 1 multipv 1 score cp -161 nodes 5 nps 357 hashfull 0 tbhits 0 time 14 pv a1a2
info depth 9 seldepth 1 multipv 1 score cp -161 nodes 5 nps 333 hashfull 0 tbhits 0 time 15 pv a1a2
info depth 10 seldepth 1 multipv 1 score cp -161 nodes 5 nps 312 hashfull 0 tbhits 0 time 16 pv a1a2
info depth 11 seldepth 1 multipv 1 score cp -161 nodes 5 nps 312 hashfull 0 tbhits 0 time 16 pv a1a2
info depth 12 seldepth 1 multipv 1 score cp -161 nodes 5 nps 294 hashfull 0 tbhits 0 time 17 pv a1a2
info depth 13 seldepth 1 multipv 1 score cp -161 nodes 5 nps 294 hashfull 0 tbhits 0 time 17 pv a1a2
info depth 14 seldepth 1 multipv 1 score cp -161 nodes 5 nps 277 hashfull 0 tbhits 0 time 18 pv a1a2
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info depth 185 seldepth 1 multipv 1 score cp -161 nodes 5 nps 17 hashfull 0 tbhits 0 time 283 pv a1a2
info depth 186 seldepth 1 multipv 1 score cp -161 nodes 5 nps 17 hashfull 0 tbhits 0 time 284 pv a1a2
info depth 187 seldepth 1 multipv 1 score cp -161 nodes 5 nps 17 hashfull 0 tbhits 0 time 285 pv a1a2
info depth 188 seldepth 1 multipv 1 score cp -161 nodes 5 nps 17 hashfull 0 tbhits 0 time 288 pv a1a2
info depth 189 seldepth 1 multipv 1 score cp -161 nodes 5 nps 17 hashfull 0 tbhits 0 time 292 pv a1a2
info depth 190 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 295 pv a1a2
info depth 191 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 295 pv a1a2
info depth 192 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 296 pv a1a2
info depth 193 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 297 pv a1a2
info depth 194 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 298 pv a1a2
info depth 195 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 299 pv a1a2
info depth 196 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 299 pv a1a2
info depth 197 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 300 pv a1a2
info depth 198 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 303 pv a1a2
info depth 199 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 307 pv a1a2
info depth 200 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 310 pv a1a2
info depth 201 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 310 pv a1a2
info depth 202 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 311 pv a1a2
info depth 203 seldepth 1 multipv 1 score cp -161 nodes 5 nps 16 hashfull 0 tbhits 0 time 312 pv a1a2
info depth 204 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 313 pv a1a2
info depth 205 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 313 pv a1a2
info depth 206 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 314 pv a1a2
info depth 207 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 315 pv a1a2
info depth 208 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 316 pv a1a2
info depth 209 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 319 pv a1a2
info depth 210 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 323 pv a1a2
info depth 211 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 324 pv a1a2
info depth 212 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 326 pv a1a2
info depth 213 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 326 pv a1a2
info depth 214 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 327 pv a1a2
info depth 215 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 328 pv a1a2
info depth 216 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 329 pv a1a2
info depth 217 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 329 pv a1a2
info depth 218 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 330 pv a1a2
info depth 219 seldepth 1 multipv 1 score cp -161 nodes 5 nps 15 hashfull 0 tbhits 0 time 331 pv a1a2
info depth 220 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 335 pv a1a2
info depth 221 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 338 pv a1a2
info depth 222 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 340 pv a1a2
info depth 223 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 341 pv a1a2
info depth 224 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 342 pv a1a2
info depth 225 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 343 pv a1a2
info depth 226 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 344 pv a1a2
info depth 227 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 344 pv a1a2
info depth 228 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 345 pv a1a2
info depth 229 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 346 pv a1a2
info depth 230 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 347 pv a1a2
info depth 231 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 350 pv a1a2
info depth 232 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 354 pv a1a2
info depth 233 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 355 pv a1a2
info depth 234 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 356 pv a1a2
info depth 235 seldepth 1 multipv 1 score cp -161 nodes 5 nps 14 hashfull 0 tbhits 0 time 357 pv a1a2
info depth 236 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 358 pv a1a2
info depth 237 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 359 pv a1a2
info depth 238 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 360 pv a1a2
info depth 239 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 361 pv a1a2
info depth 240 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 362 pv a1a2
info depth 241 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 365 pv a1a2
info depth 242 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 369 pv a1a2
info depth 243 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 370 pv a1a2
info depth 244 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 372 pv a1a2
info depth 245 seldepth 1 multipv 1 score cp -161 nodes 5 nps 13 hashfull 0 tbhits 0 time 372 pv a1a2
bestmove a1a2

Operating system

Windows

Stockfish version

Stockfish 16.1
@mhouppin
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Expected: crashes

"Crashing" is definitely not the correct behavior to have here. Erroring out would be a possibility, FEN sanitizing has been a long-time discussion in issues, and a PR is currently open that addresses this: #4563

@winapiadmin
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Expected: crashes

"Crashing" is definitely not the correct behavior to have here. Erroring out would be a possibility, FEN sanitizing has been a long-time discussion in issues, and a PR is currently open that addresses this: #4563

So now the problem is in searching algorithm, exactly generating legal moves.

@PGG106
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PGG106 commented Mar 22, 2024 •
edited
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This is not a matter of search (nor move generation), by definition you can't have legal moves in an illegal position, especially one without pieces, the correct solution as already pointed out would be to refuse to parse the fen, long before the movegen or the search get called.

@mhouppin
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This has nothing to do with the search algorithm. The UCI protocol assumes that every position/move sent by the GUI is valid, and the PR I mentioned earlier fixes this by not accepting illegal positions. The search isn't at fault here, the UCI handler is the one responsible.

@dav1312
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dav1312 commented Mar 22, 2024

https://github.com/official-stockfish/Stockfish/wiki/Stockfish-FAQ#stockfish-crashed

@Disservin Disservin linked a pull request Apr 5, 2024 that will close this issue
[RFC] Handle *some* out-of-spec behaviour explicitly #4563
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@Disservin
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to be handled by 4563

@Disservin Disservin closed this as not planned Won't fix, can't repro, duplicate, stale Aug 20, 2024
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[RFC] Handle *some* out-of-spec behaviour explicitly Sopel97/Stockfish
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@mhouppin @Disservin @dav1312 @PGG106 @winapiadmin