Chess engine: Seawall 20230316

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Chess engine: Seawall,
Rating CEDR=2668  Author - Patrick Heck

This is an [UCI] chess engine. It started as an attempt to build a minimal program that was able to play chess. Over time, it has gained features to make it stronger, but it still implements only a subset of UCI necessary to play games, and there's almost no evaluation.

Some ideas have been borrowed more directly than others; the obstruction difference algorithm is based on the version from [Chess Movegen], while the use of a low pass filter and capture history for move ordering were borrowed from [Stockfish].

github:https://github.com/petur/seawall/releases/tag/r20230316

Individual statistics: Seawall 20230105 - 133 games (+ 39,= 17,- 77), 35.7  %
Critter 1.6a                  :   6 (+  0,=  1,-  5),  8.3 %
Fritz 17                      :   2 (+  0,=  0,-  2),  0.0 %
Asymptote 0.8                 :   1 (+  0,=  0,-  1),  0.0 %
Devel 4.0.2.3                 :   1 (+  0,=  1,-  0), 50.0 %
Barbarossa 0.6.0              :   1 (+  1,=  0,-  0), 100.0 %
Supernova 2.4                 :   1 (+  0,=  1,-  0), 50.0 %
Zevra 2.5                     :   1 (+  0,=  1,-  0), 50.0 %
Loki 3.5.0                    :   1 (+  0,=  0,-  1),  0.0 %
Cosette 5.1                   :   1 (+  1,=  0,-  0), 100.0 %
FrankyGo 1.0.3                :   1 (+  1,=  0,-  0), 100.0 %
Pawn 2021-09-22               :   1 (+  1,=  0,-  0), 100.0 %
Journeyman 2.1                :   1 (+  0,=  0,-  1),  0.0 %
Anka 0.6.3                    :   1 (+  1,=  0,-  0), 100.0 %
Popochin 4.3                  :   1 (+  1,=  0,-  0), 100.0 %
FoxSEE 8.2                    :   1 (+  0,=  1,-  0), 50.0 %
Blunder 8.5.5                 :   1 (+  0,=  0,-  1),  0.0 %
Ceibo 0.9                     :   1 (+  0,=  0,-  1),  0.0 %
Dumb 1.11                     :   1 (+  1,=  0,-  0), 100.0 %
Frozenight 5.1.0              :   1 (+  0,=  0,-  1),  0.0 %
Francesca 0.32                :   1 (+  0,=  0,-  1),  0.0 %
Altair 1.0.0                  :   1 (+  1,=  0,-  0), 100.0 %
Prophet 4.3                   :   1 (+  1,=  0,-  0), 100.0 %
Fornax 4.0                    :   3 (+  2,=  1,-  0), 83.3 %
ShenYu 1.0.1                  :   1 (+  1,=  0,-  0), 100.0 %
Lynx 0.13.0                   :   1 (+  1,=  0,-  0), 100.0 %
Stockfish 15.1                :   2 (+  0,=  0,-  2),  0.0 %
Alexandria 3.1.0              :   1 (+  0,=  0,-  1),  0.0 %
Cdrill 2000                   :   2 (+  2,=  0,-  0), 100.0 %
Avalanche 1.3.1               :   1 (+  0,=  0,-  1),  0.0 %
Eubos 2.17                    :   2 (+  2,=  0,-  0), 100.0 %
Viridithas 6.0.0              :   1 (+  0,=  0,-  1),  0.0 %
Velvet 5.0.0                  :   4 (+  0,=  0,-  4),  0.0 %
Charisma Diamond              :   2 (+  0,=  0,-  2),  0.0 %
Minic 3.33                    :   4 (+  0,=  0,-  4),  0.0 %
Charisma Gold                 :   2 (+  0,=  0,-  2),  0.0 %
Cheers 0.1                    :   3 (+  1,=  2,-  0), 66.7 %
Mittens 0.9                   :   6 (+  0,=  0,-  6),  0.0 %
Peacekeeper 1.01              :   4 (+  2,=  2,-  0), 75.0 %
Uralochka 3.39d               :   6 (+  0,=  0,-  6),  0.0 %
RukChess 3.0.13 NNUE2         :   7 (+  0,=  0,-  7),  0.0 %
Stockfish 20230102            :   2 (+  0,=  0,-  2),  0.0 %
Stockfish 20230101            :   2 (+  0,=  0,-  2),  0.0 %
Stockfish 20230104            :   2 (+  0,=  0,-  2),  0.0 %
Rebel 16.1                    :   5 (+  0,=  0,-  5),  0.0 %
Captain 3.1                   :   4 (+  4,=  0,-  0), 100.0 %
Mediocre 0.5                  :   2 (+  2,=  0,-  0), 100.0 %
Jangine 2022-12-27            :   3 (+  3,=  0,-  0), 100.0 %
Mayhem 8.0                    :   2 (+  1,=  1,-  0), 75.0 %
Sting Black Hole 3            :   2 (+  0,=  0,-  2),  0.0 %
Blue Marlin 15.6              :   2 (+  0,=  0,-  2),  0.0 %
BrainLearn 21.1               :   2 (+  0,=  0,-  2),  0.0 %
Carp 1.1.0                    :   3 (+  3,=  0,-  0), 100.0 %
Zagreus 1.1.0                 :   2 (+  2,=  0,-  0), 100.0 %
Clovis I                      :   2 (+  0,=  1,-  1), 25.0 %
Raven 1.30                    :   2 (+  0,=  2,-  0), 50.0 %
Koivisto 8.17                 :   2 (+  0,=  0,-  2),  0.0 %
Peacekeeper 1.1               :   2 (+  1,=  1,-  0), 75.0 %
Akimbo 0.1.1                  :   3 (+  1,=  1,-  1), 50.0 %
BlackCore 5.0                 :   3 (+  0,=  0,-  3),  0.0 %
Stockfish 20230114            :   2 (+  0,=  0,-  2),  0.0 %
4ku 1.1                       :   2 (+  0,=  1,-  1), 25.0 %
Tofiks 1.0                    :   1 (+  1,=  0,-  0), 100.0 %
MagiC 2.9                     :   1 (+  1,=  0,-  0), 100.0 %


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