andersfylling / david Goto Github PK
View Code? Open in Web Editor NEWChess engine written from scratch using C++17
Chess engine written from scratch using C++17
Please see https://www.chessclub.com/user/chessviewer/smith.html for correct format/syntax.
Generating EGN for a game state where a promotion takes place results in incorrect behavior:
"rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R w KQ - 1 8"
+---+---+---+---+---+---+---+---+
8 | r | n | b | q | - | k | - | r |
+---+---+---+---+---+---+---+---+
7 | p | p | - | P | b | p | p | p |
+---+---+---+---+---+---+---+---+
6 | - | - | p | - | - | - | - | - |
+---+---+---+---+---+---+---+---+
5 | - | - | - | - | - | - | - | - |
+---+---+---+---+---+---+---+---+
4 | - | - | B | - | - | - | - | - |
+---+---+---+---+---+---+---+---+
3 | - | - | - | - | - | - | - | - |
+---+---+---+---+---+---+---+---+
2 | P | P | P | - | N | n | P | P |
+---+---+---+---+---+---+---+---+
1 | R | N | B | Q | K | - | - | R |
+---+---+---+---+---+---+---+---+
A B C D E F G H
the promotion at D7 gets the EGN H1C8.
when using juddperft. The string (in form of int) is casted to compare perft results. Might be what causes the error.
Use std::stol.
One or more of the following FEN strings will have an incorrect amount of moves.
These were found by generating all the moves for FEN: "rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R w KQ - 1 8" and creating FEN representations of those. Since perft(2) is incorrect.
0: rnbq1k1r/pp1Pbppp/2p5/8/2B5/7P/PPP1NnP1/RNBQK2R b KQ - 0 8, perft: 34
1: rnbq1k1r/pp1Pbppp/2p5/8/2B4P/8/PPP1NnP1/RNBQK2R b KQ h3 0 8, perft: 34
2: rnbq1k1r/pp1Pbppp/2p5/8/2B5/6P1/PPP1Nn1P/RNBQK2R b KQ - 0 8, perft: 34
3: rnbq1k1r/pp1Pbppp/2p5/8/2B3P1/8/PPP1Nn1P/RNBQK2R b KQ g3 0 8, perft: 34
4: rnbq1k1r/pp1Pbppp/2p5/8/2B5/2P5/PP2NnPP/RNBQK2R b KQ - 0 8, perft: 34
5: rnbq1k1r/pp1Pbppp/2p5/8/2B5/1P6/P1P1NnPP/RNBQK2R b KQ - 0 8, perft: 34
6: rnbq1k1r/pp1Pbppp/2p5/8/1PB5/8/P1P1NnPP/RNBQK2R b KQ b3 0 8, perft: 33
7: rnbq1k1r/pp1Pbppp/2p5/8/2B5/P7/1PP1NnPP/RNBQK2R b KQ - 0 8, perft: 34
8: rnbq1k1r/pp1Pbppp/2p5/8/P1B5/8/1PP1NnPP/RNBQK2R b KQ a3 0 8, perft: 34
9: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK1R1 b Q - 0 8, perft: 34
10: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQKR2 b Q - 0 8, perft: 34
11: rnRq1k1r/pp2bppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 31
12: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPPNNnPP/R1BQK2R b KQ - 0 8, perft: 34
13: rnbq1k1r/pp1Pbppp/2p5/8/2B5/2N5/PPP1NnPP/R1BQK2R b KQ - 0 8, perft: 34
14: rnbq1k1r/pp1Pbppp/2p5/8/2B5/N7/PPP1NnPP/R1BQK2R b KQ - 0 8, perft: 34
15: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP2nPP/RNBQK1NR b KQ - 0 8, perft: 34
16: rnbq1k1r/pp1Pbppp/2p5/8/2B5/6N1/PPP2nPP/RNBQK2R b KQ - 0 8, perft: 34
17: rnbq1k1r/pp1Pbppp/2p5/8/2B5/2N5/PPP2nPP/RNBQK2R b KQ - 0 8, perft: 34
18: rnbq1k1r/pp1Pbppp/2p5/8/2B2N2/8/PPP2nPP/RNBQK2R b KQ - 0 8, perft: 34
19: rnbq1k1r/pp1Pbppp/2p5/8/2BN4/8/PPP2nPP/RNBQK2R b KQ - 0 8, perft: 34
20: rnNq1k1r/pp2bppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 41
21: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPPBNnPP/RN1QK2R b KQ - 0 8, perft: 34
22: rnbq1k1r/pp1Pbppp/2p5/8/2B5/4B3/PPP1NnPP/RN1QK2R b KQ - 0 8, perft: 34
23: rnbq1k1r/pp1Pbppp/2p5/8/2B2B2/8/PPP1NnPP/RN1QK2R b KQ - 0 8, perft: 34
24: rnbq1k1r/pp1Pbppp/2p5/6B1/2B5/8/PPP1NnPP/RN1QK2R b KQ - 0 8, perft: 32
25: rnbq1k1r/pp1Pbppp/2p4B/8/2B5/8/PPP1NnPP/RN1QK2R b KQ - 0 8, perft: 31
26: rnbq1k1r/pp1Pbppp/2p5/8/8/3B4/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 34
27: rnbq1k1r/pp1Pbppp/2p5/8/8/1B6/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 34
28: rnbq1k1r/pp1Pbppp/2p5/3B4/8/8/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 35
29: rnbq1k1r/pp1Pbppp/2p5/1B6/8/8/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 34
30: rnbq1k1r/pp1Pbppp/2p1B3/8/8/8/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 35
31: rnbq1k1r/pp1Pbppp/B1p5/8/8/8/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 33
32: rnbq1k1r/pp1PbBpp/2p5/8/8/8/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 32
33: rnBq1k1r/pp2bppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 41
34: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPPQNnPP/RNB1K2R b KQ - 0 8, perft: 34
35: rnbq1k1r/pp1Pbppp/2p5/8/2B5/3Q4/PPP1NnPP/RNB1K2R b KQ - 0 8, perft: 34
36: rnbq1k1r/pp1Pbppp/2p5/8/2BQ4/8/PPP1NnPP/RNB1K2R b KQ - 0 8, perft: 34
37: rnbq1k1r/pp1Pbppp/2p5/3Q4/2B5/8/PPP1NnPP/RNB1K2R b KQ - 0 8, perft: 35
38: rnbq1k1r/pp1Pbppp/2pQ4/8/2B5/8/PPP1NnPP/RNB1K2R b KQ - 0 8, perft: 28
39: rnQq1k1r/pp2bppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R b KQ - 0 8, perft: 31
40: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQ1K1R b - - 0 8, perft: 34
41: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NKPP/RNBQ3R b KQ - 0 8, perft: 28
42: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPPKNnPP/RNBQ3R b - - 0 8, perft: 34
43: rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQ1RK1 b - - 0 8, perft: 34
Edit: Updated after FEN generation fix.
Does not use a combination of a char and a int, but rather a index between 0-63 to show the en passant position.
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