Chess engine: Captain 4.0

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Captain is a UCI compliant chess engine written in C++. Captain has recently been rewritten, so it may be buggy.

Rating CEDR=1602

I have learned a lot from studying other chess engines and projects, including:
* [Stockfish](https://github.com/official-stockfish/Stockfish)
* [Arasan](https://github.com/jdart1/arasan-chess)
* [Nemorino](https://bitbucket.org/christian_g_nther/nemorino/src/master/)
* [Gigantua](https://github.com/Gigantua/Gigantua)
* [The chess programming wiki](https://www.chessprogramming.org/Main_Page)

v.4.0:
v4.0 should sit somewhere between 1900-2200 elo.

Individual statistics: Captain 2.0 - 108 games (+  1,=  1,-106),  1.4 %
Critter 1.6a                  :   2 (+  0,=  0,-  2),  0.0 %
Colossus 2022a                :   2 (+  0,=  0,-  2),  0.0 %
Vafra 3.3.2                   :   2 (+  0,=  0,-  2),  0.0 %
Lc0 0.30.0-dev+git.6d9bd9d    :   2 (+  0,=  0,-  2),  0.0 %
Koivisto 8.16                 :   2 (+  0,=  0,-  2),  0.0 %
Marvin 6.1.0                  :   2 (+  0,=  0,-  2),  0.0 %
Berserk 10                    :   2 (+  0,=  0,-  2),  0.0 %
Fire NN 1072022               :   2 (+  0,=  0,-  2),  0.0 %
Frozenight 5.1.0              :   4 (+  0,=  0,-  4),  0.0 %
Lynx 0.12.0                   :   2 (+  0,=  0,-  2),  0.0 %
Trinket 3.0.0                 :   2 (+  0,=  0,-  2),  0.0 %
AI 27.0                       :   2 (+  0,=  0,-  2),  0.0 %
Prophet 4.3                   :   8 (+  0,=  0,-  8),  0.0 %
QuintBot 1.0.0                :   4 (+  0,=  0,-  4),  0.0 %
Seer 2.6                      :   4 (+  0,=  0,-  4),  0.0 %
CorChess 241022               :   4 (+  0,=  0,-  4),  0.0 %
Blue Marlin 15.4              :   4 (+  0,=  0,-  4),  0.0 %
BrainLearn 19.1               :   4 (+  0,=  0,-  4),  0.0 %
Caissa 1.2                    :   6 (+  0,=  0,-  6),  0.0 %
ShashChess 25.2               :   4 (+  0,=  0,-  4),  0.0 %
Kookaburra 1.01               :   4 (+  0,=  0,-  4),  0.0 %
Seawall 20221105              :   2 (+  0,=  0,-  2),  0.0 %
CDrill 2000                   :   2 (+  0,=  0,-  2),  0.0 %
Fornax 4.0                    :   6 (+  0,=  0,-  6),  0.0 %
Winter 1.0                    :   4 (+  0,=  0,-  4),  0.0 %
Stash 34.0                    :   2 (+  0,=  0,-  2),  0.0 %
Mayhem 7.6                    :   4 (+  1,=  0,-  3), 25.0 %
BlackCore 3.0                 :   2 (+  0,=  0,-  2),  0.0 %
ShenYu 1.0.1                  :   2 (+  0,=  0,-  2),  0.0 %
Kimbo 0.3.0                   :   2 (+  0,=  0,-  2),  0.0 %
Bienchen 1.0                  :   2 (+  0,=  0,-  2),  0.0 %
Sturddle 1.04                 :   2 (+  0,=  0,-  2),  0.0 %
Eubos 2.15                    :   4 (+  0,=  0,-  4),  0.0 %
RapChess 2022-10-25           :   4 (+  0,=  1,-  3), 12.5 %
Chess4j 5.1                   :   2 (+  0,=  0,-  2),  0.0 %




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