Author: Erik Madsen

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MadChess 3.1 Beta 533e382 (Move Legality Performance Improvement)

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I improved the performance of code that determines the legality of pseudo-legal moves. Previously, move legality was tested prior to playing a move. This consisted of playing a move (to test whether it exposed its own king to check and whether it delivered check on the enemy king), undoing the move, updating the “check” move property, then re-playing the move. Now a move is played, move legality and check is tested, and the Board.PlayMove method returns a (bool isLegal, bool deliversCheck) tuple. The calling method (such as Search.GetDynamicScore or Search.GetQuietScore) then either 1) undoes the move (if illegal or futile)… Continue Reading

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Doing The Jellyfish Stomp

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MadChess 3.0 participated in a tournament Graham Banks arranged, named Doing The Jellyfish Stomp. 1 2 3 4 5 6 7 8 9 0 1 Coiled 1.1 NoNNUE 64-bit **** 1001 1½½1 11½1 1111 ½110 111½ 1½½1 ½½11 ½½11 27.5/36 2 Fridolin 3.10 64-bit 0110 **** 1½½½ 01½0 0½½1 00½½ 110½ 11½1 1010 0½½1 19.0/36 335.25 3 RookieMonster 1.9.6-dev 64-bit 0½½0 0½½½ **** ½001 1001 01½1 11½0 1111 00½1 1½01 19.0/36 322.75 4 Lozza 2.2 64-bit 00½0 10½1 ½110 **** 00½1 1½½½ 011½ 01½0 1½10 1½10 18.5/36 314.75 5 Betsabe II 2020 0000 1½½0 0110 11½0 **** 0011 11½0 0011… Continue Reading

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The Rookies And The Assassin

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MadChess 3.0 participated in a tournament Graham Banks arranged, named The Rookies And The Assassin. 1 2 3 4 5 6 7 8 9 0 1 2 1 CM9000 Assassin **** 0½10 ½½11 1½½1 101½ ½1½0 ½01½ 0101 ½011 1½11 01½1 1111 28.5/44 2 RookieMonster 1.9.6-dev 64-bit 1½01 **** 1110 0101 01½1 1011 ½½½½ 0½00 1101 100½ 0111 1101 26.0/44 3 Lozza 2.1 64-bit ½½00 0001 **** 100½ 1½0½ 1101 ½½½½ 11½1 ½½½½ 111½ ½111 00½½ 24.0/44 4 Betsabe II 2020 0½½0 1010 011½ **** 1½½½ 10½1 1½1½ ½½½1 ½½00 0100 1½1½ 11½0 23.5/44 503.00 5 Blunder 7.6.0 64-bit 010½… Continue Reading

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Banks 91st Amateur Series Division 7

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MadChess 3.0 participated in Graham Banks’ 91st amateur tournament in division 7. 1 2 3 4 5 6 7 8 9 0 1 2 1 Drosophila 1.6 64-bit **** 111½ 10½0 ½0½½ 1111 1101 1011 ½1½1 1111 1½01 101½ ½½11 31.5/44 2 MadChess 3.0 64-bit 000½ **** ½1½½ 1½½1 011½ 1½1½ 101½ ½0½½ 101½ 0½11 1½11 1½11 27.5/44 3 Delocto 200419 64-bit 01½1 ½0½½ **** ½½01 ½1½0 110½ 1½11 0010 ½1½½ 1½1½ 11½½ ½111 27.0/44 4 Betsabe II 2020 ½1½½ 0½½0 ½½10 **** 0011 ½1½1 0½00 ½1½1 ½½11 1101 11½½ ½½11 26.0/44 5 Raven 1.20 64-bit 0000 100½ ½0½1 1100… Continue Reading

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Toxic Environment

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MadChess 3.0 participated in a tournament Graham Banks arranged, named Toxic Environment. 1 2 3 4 5 6 7 8 9 0 1 RookieMonster 1.9.6-dev 64-bit **** 1½½1 1110 0100 111½ ½½1½ 0½01 ½110 1½11 01½1 23.0/36 401.75 2 Delocto 200419 64-bit 0½½0 **** ½½11 1½½0 100½ 1101 0½½1 1111 0½11 1111 23.0/36 377.50 3 CM11th Toxic 0001 ½½00 **** 11½1 1101 ½011 101½ ½1½0 0½11 1½½1 21.0/36 4 Blunder 7.6.0 64-bit 1011 0½½1 00½0 **** 0½11 ½1½1 011½ 01½1 ½1½0 01½1 20.5/36 5 Betsabe II 2020 000½ 011½ 0010 1½00 **** ½01½ ½1½½ ½110 1001 1111 18.5/36 6 Zevra… Continue Reading