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MadChess 2.1 Released

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I have released version 2.1 of my chess engine. I built this version of MadChess using .NET Core, Microsoft’s new cross-OS development platform. I have provided source code and binaries for Windows on the Downloads page.

I do not have access to a Linux or Mac machine. If you are feeling adventurous and would like to build Linux or Mac binaries, please refer to Getting Started with .NET Core on Windows / Linux / MacOS for instructions on how to build .NET Core applications.

I have configured the MadChess project to build a self-contained application. All binaries required to run MadChess are included in the ZIP file. Unlike previous versions of MadChess, no prerequisite .NET framework must be installed prior to running the engine.

MadChess 2.1 is about 60 or 70 Elo stronger than version 2.0. It includes the following improvements, some impacting playing strength, some more focused on code quality.

  • Converted cached position from a class to a ulong primitive with bitwise operations.
  • Tuned evaluation using the technique described by Peter Österlund.
  • Include static exchange score when determining move futility.
  • Update history heuristic value of previously played quiet moves that failed to produce a cutoff.
  • Extract principal variation from a triangular array (rather than from hash table).
  • Simplified time management.
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Banks 62nd Amateur Series Division 7

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MadChess 2.0 participated in Graham Banks’ 62nd amateur tournament in division 7.

                                  1    2    3    4    5    6    7    8    9    0    1    2    
1   Shallow r694 64-bit           **** 1110 1111 ½110 ½½10 1011 ½½11 1½½1 ½1½½ 1111 1½11 1111  34.5/44
2   Waxman 2016                   0001 **** 0010 ½0½1 0011 0½½1 1011 1111 1111 101½ ½111 ½1½0  27.0/44
3   Jazz 840 64-bit               0000 1101 **** ½0½1 ½½10 1010 0½1½ ½½½0 ½½11 ½½11 11½1 11½1  25.5/44
4   Ares 1.005.2 64-bit           ½001 ½1½0 ½1½0 **** 0½10 1011 010½ 101½ ½½½1 10½1 ½101 1½11  25.0/44
5   MadChess 2.0 64-bit           ½½01 1100 ½½01 1½01 **** 0100 0110 ½½10 1011 0½01 1110 111½  24.5/44
6   Jumbo 0.4.17 64-bit           0100 1½½0 0101 0100 1011 **** 1110 0001 ½0½1 0101 1111 11½½  24.0/44  481.00
7   Gibbon 2.69a 64-bit           ½½00 0100 1½0½ 101½ 1001 0001 **** 1½11 ½1½0 1110 ½½11 1½½1  24.0/44  478.50
8   Schooner 1.5 64-bit           0½½0 0000 ½½½1 010½ ½½01 1110 0½00 **** 1½0½ 1½11 11½1 ½½½1  22.0/44
9   Fischerle 0.9.70 SE 64-bit    ½0½½ 0000 ½½00 ½½½0 0100 ½1½0 ½0½1 0½1½ **** ½111 1½½½ 1½0½  19.0/44
10  Absolute Zero 2.4.7.2 64-bit  0000 010½ ½½00 01½0 1½10 1010 0001 0½00 ½000 **** ½½11 ½101  16.0/44
11  RamJet 0.13                   0½00 ½000 00½0 ½010 0001 0000 ½½00 00½0 0½½½ ½½00 **** ½111  11.5/44
12  Tunguska 1.0 64-bit           0000 ½0½1 00½0 0½00 000½ 00½½ 0½½0 ½½½0 0½1½ ½010 ½000 ****  11.0/44

Games

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Banks 61st Amateur Series Division 6

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MadChess 2.0 participated in Graham Banks’ 61st amateur tournament in division 6.

                                  1    2    3    4    5    6    7    8    9    0    1    2    3    4    
1   CmcChess 2.6 64-bit           **** ½½1½ 1½0½ ½100 010½ 0110 ½110 ½11½ ½1½1 101½ 1½1½ 11½1 0111 ½010  31.5/52
2   TJchess 1.3 64-bit            ½½0½ **** ½½11 ½½00 1½01 ½½0½ ½011 0111 ½½01 111½ 001½ 1½10 1101 11½1  31.0/52
3   Orion 0.3.0 64-bit            0½1½ ½½00 **** ½0½½ ½½½½ 1½½½ 1100 1½01 ½101 0½10 0110 1½11 1111 ½½1½  29.5/52
4   Waxman 2015                   ½011 ½½11 ½1½½ **** 0100 1100 1½½1 ½00½ 10½1 01½0 ½½½1 ½½0½ ½½½1 ½111  29.0/52
5   Ares 1.005.2 64-bit           101½ 0½10 ½½½½ 1011 **** 0001 11½½ 011½ 10½½ 1½1½ 10½0 ½00½ ½11½ 1½10  28.5/52  733.00
6   Schooner 1.5 64-bit           1001 ½½1½ 0½½½ 0011 1110 **** 0000 0110 0010 ½½½1 11½½ ½½11 11½1 ½1½½  28.5/52  708.50
7   Myrddin 0.87 64-bit           ½001 ½100 0011 0½½0 00½½ 1111 **** ½001 011½ 101½ 1101 1011 0½01 0111  28.0/52
8   Shallow r694 64-bit           ½00½ 1000 0½10 ½11½ 100½ 1001 ½110 **** ½½00 0101 010½ 1111 0½11 1111  27.5/52
9   MadChess 2.0 64-bit           ½0½0 ½½10 ½010 01½0 01½½ 1101 100½ ½½11 **** ½½1½ 111½ 0100 ½½½½ 1½01  27.0/52
10  Nemeton 1.41                  010½ 000½ 1½01 10½1 0½0½ ½½½0 010½ 1010 ½½0½ **** 101½ 0½1½ 010½ 1111  24.5/52
11  Jazz 840 64-bit               0½0½ 110½ 1001 ½½½0 01½1 00½½ 0010 101½ 000½ 010½ **** ½½01 ½½½½ ½01½  22.0/52
12  Fischerle 0.9.70 SE 64-bit    00½0 0½01 0½00 ½½1½ ½11½ ½½00 0100 0000 1011 1½0½ ½½10 **** 1½½½ 001½  21.0/52
13  Gibbon 2.69a 64-bit           1000 0010 0000 ½½½0 ½00½ 00½0 1½10 1½00 ½½½½ 101½ ½½½½ 0½½½ **** 0100  18.0/52  468.75
14  Absolute Zero 2.4.7.2 64-bit  ½101 00½0 ½½0½ ½000 0½01 ½0½½ 1000 0000 0½10 0000 ½10½ 110½ 1011 ****  18.0/52  457.50

Games

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Banks 60th Amateur Series Division 6

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MadChess 2.0 participated in Graham Banks’ 60th amateur tournament in division 6.

                                  1      2      3      4      5      6      7      8      9      0      
1   Bagatur 1.4d 64-bit           ****** ½000½1 ½110½1 11½1½0 1½11½1 1½11½1 111110 11½½1½ ½11111 110½01  38.5/54
2   MadChess 2.0 64-bit           ½111½0 ****** 00½1½1 011011 ½11½½1 0111½1 ½01½½0 101011 001100 1110½1  33.0/54
3   Myrddin 0.87 64-bit           ½001½0 11½0½0 ****** ½101½1 ½00½0½ ½½100½ 01½½11 11½0½1 11111½ 11½1½1  31.5/54
4   Orion 0.3.0 64-bit            00½0½1 100100 ½010½0 ****** ½0½011 ½½011½ 11½½11 011010 10101½ 1½1011  28.5/54
5   Waxman 2015                   0½00½0 ½00½½0 ½11½1½ ½1½100 ****** 00½½0½ ½½1110 ½½011½ ½11110 ½½111½  28.0/54
6   Nemeton 1.41                  0½00½0 1000½0 ½½011½ ½½100½ 11½½1½ ****** 1½0101 ½11½½½ ½½½111 11000½  27.5/54
7   Jazz 840 64-bit               000001 ½10½½1 10½½00 00½½00 ½½0001 0½1010 ****** 001½11 011½11 0½0101  22.5/54
8   Fischerle 0.9.70 SE 64-bit    00½½0½ 010100 00½1½0 100101 ½½100½ ½00½½½ 110½00 ****** ½00100 ½1½½1½  21.0/54  559.00
9   Gibbon 2.69a 64-bit           ½00000 110011 00000½ 01010½ ½00001 ½½½000 100½00 ½11011 ****** ½½111½  21.0/54  533.00
10  Absolute Zero 2.4.7.2 64-bit  001½10 0001½0 00½0½0 0½0100 ½½000½ 00111½ 1½1010 ½0½½0½ ½½000½ ******  18.5/54

Games

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Banks 59th Amateur Series Division 7

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MadChess 2.0 participated in Graham Banks’ 59th amateur tournament in division 7.

                                  1    2    3    4    5    6    7    8    9    0    1    2    
1   CyberPagno 3.0 64-bit         **** 1½11 ½01½ ½111 ½111 1011 1111 1½10 111½ 1½11 1111 111½  36.5/44
2   Ethereal 7.61 64-bit          0½00 **** 0½0½ 1½01 0110 1½11 1101 111½ 1111 01½1 1111 ½½11  29.5/44
3   Gibbon 2.69a 64-bit           ½10½ 1½1½ **** 11½1 ½110 11½½ 0101 ½½11 ½110 1010 00½1 111½  28.5/44
4   Waxman 2015                   ½000 0½10 00½0 **** 1010 1½0½ 1½11 1111 1½00 ½0½1 111½ 111½  24.5/44
5   MadChess 2.0 64-bit           ½000 1001 ½001 0101 **** 100½ 1101 1100 0111 1½10 110½ 011½  23.0/44
6   Absolute Zero 2.4.4.0 64-bit  0100 0½00 00½½ 0½1½ 011½ **** 1½10 1½01 ½101 ½½01 ½1½1 0110  21.5/44
7   Fischerle 0.9.70 SE 64-bit    0000 0010 1010 0½00 0010 0½01 **** 1½1½ 1100 1½11 11½½ ½1½1  20.5/44
8   Protej 0.5.8c                 0½01 000½ ½½00 0000 0011 0½10 0½0½ **** 011½ 1101 1011 1111  20.0/44
9   Schooner 1.5 64-bit           000½ 0000 ½001 0½11 1000 ½010 0011 100½ **** ½111 1½1½ 101½  19.5/44
10  Napoleon 1.6.0b 64-bit        0½00 10½0 0101 ½1½0 0½01 ½½10 0½00 0010 ½000 **** 1½1½ 10½½  16.5/44
11  Obender 03.2016 64-bit        0000 0000 11½0 000½ 001½ ½0½0 00½½ 0100 0½0½ 0½0½ **** ½111  13.0/44
12  ChessKiss 1.7c 64-bit         000½ ½½00 000½ 000½ 100½ 1001 ½0½0 0000 010½ 01½½ ½000 ****  11.0/44

Games