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Chess engine ShashChess 31 (Windows, Linux and Mac)

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ShashChess - UCI chess engine.
Rating CEDR=3720 (01.04.2023)

ShashChess is a free UCI chess engine derived from Stockfish family chess engines. 

v.31:
Speedup and simplification in shashin theory
Stockfish patch
Assign negative stat bonuses for quiet moves at Pv nodes
This patch assigns negative stat bonuses for quiet moves at pv nodes which are searched at depth greater than this node assumes, so are extended.

Individual statistics: ShashChess 28 - 504 games (+133,=365,-  6), 62.6 %
Critter 1.6a                  :   6 (+  5,=  1,-  0), 91.7 %
Komodo 13.02                  :   2 (+  2,=  0,-  0), 100.0 %
RofChade 3.0                  :   8 (+  3,=  5,-  0), 68.8 %
SlowChess 2.9                 :   8 (+  2,=  6,-  0), 62.5 %
Fisherov chess monk 1.2       :  22 (+  1,= 19,-  2), 47.7 %
Demolito 2021-10-21           :   2 (+  2,=  0,-  0), 100.0 %
Revenge 3.0                   :  14 (+  2,= 12,-  0), 57.1 %
Booot 7.0                     :   2 (+  2,=  0,-  0), 100.0 %
Seer 2.6                      :   8 (+  5,=  3,-  0), 81.2 %
Kayra 1.7                     :  18 (+  0,= 18,-  0), 50.0 %
Berserk 20221129              :   2 (+  1,=  1,-  0), 75.0 %
Stockfish 15.1                :  18 (+  0,= 18,-  0), 50.0 %
RubiChess 20221203            :   8 (+  3,=  5,-  0), 68.8 %
Cheese 3.1.1                  :   2 (+  2,=  0,-  0), 100.0 %
Kookaburra 1.03a              :  18 (+  0,= 18,-  0), 50.0 %
Little Goliath 3.16           :   2 (+  2,=  0,-  0), 100.0 %
Dragon 3.2                    :  20 (+  1,= 19,-  0), 52.5 %
Velvet 5.0.0                  :   4 (+  3,=  1,-  0), 87.5 %
Minic 3.33                    :   4 (+  2,=  2,-  0), 75.0 %
Uralochka 3.39d               :  10 (+  7,=  3,-  0), 85.0 %
Rebel 16.1                    :   6 (+  4,=  2,-  0), 83.3 %
Eman 8.60                     :   4 (+  0,=  4,-  0), 50.0 %
Blue Marlin 15.6              :  18 (+  0,= 18,-  0), 50.0 %
BrainLearn 21.1               :  18 (+  2,= 16,-  0), 55.6 %
Koivisto 9.0                  :   4 (+  2,=  2,-  0), 75.0 %
Polyfish 230115               :   4 (+  0,=  4,-  0), 50.0 %
Caissa 1.5                    :   4 (+  2,=  2,-  0), 75.0 %
Koivisto 9.0 Ipman            :   2 (+  1,=  1,-  0), 75.0 %
Stockfish 20230125            :   8 (+  0,=  8,-  0), 50.0 %
Corchess 230125               :   2 (+  0,=  2,-  0), 50.0 %
Viridithas 7.0.0              :  14 (+ 11,=  3,-  0), 89.3 %
Protej 0.6.4                  :   6 (+  6,=  0,-  0), 100.0 %
BlackCore 5.1                 :   6 (+  3,=  3,-  0), 75.0 %
Vafra 12.3 Cfish              :  10 (+  3,=  7,-  0), 65.0 %
CorChess 20230125             :   6 (+  0,=  6,-  0), 50.0 %
Winter 2.0                    :   6 (+  5,=  1,-  0), 91.7 %
Eman 8.70                     :  20 (+  0,= 20,-  0), 50.0 %
Igel 3.4.0                    :  14 (+  8,=  6,-  0), 78.6 %
Stockfish 20230202            :   4 (+  0,=  4,-  0), 50.0 %
Polyfish 230202               :  18 (+  0,= 17,-  1), 47.2 %
Smallbrain 7.0                :   6 (+  5,=  1,-  0), 91.7 %
Charisma Light 2              :   6 (+  0,=  5,-  1), 41.7 %
Stockfish 230202              :   2 (+  0,=  2,-  0), 50.0 %
Stockfish 230125 Ivec         :   2 (+  0,=  2,-  0), 50.0 %
CorChess 20230210             :   4 (+  0,=  4,-  0), 50.0 %
Caissa 1.6                    :   2 (+  2,=  0,-  0), 100.0 %
Velvet 5.1.0                  :   4 (+  4,=  0,-  0), 100.0 %
Fat Fritz 2                   :  12 (+  2,= 10,-  0), 58.3 %
Patzer AI 020223              :   8 (+  1,=  7,-  0), 56.2 %
Berserk 11                    :   2 (+  1,=  1,-  0), 75.0 %
Clover 3.3.1                  :   2 (+  2,=  0,-  0), 100.0 %
Caissa 1.6.3                  :   4 (+  3,=  1,-  0), 87.5 %
Rebel 16.2                    :  14 (+  5,=  9,-  0), 67.9 %
Stockfish 20230218            :   6 (+  0,=  5,-  1), 41.7 %
Berserk 11.1                  :  12 (+  1,= 11,-  0), 54.2 %
Stockfish 20230224            :   2 (+  0,=  2,-  0), 50.0 %
Koivisto 9.2                  :  14 (+  6,=  8,-  0), 71.4 %
Charisma Light 1.0            :   2 (+  0,=  2,-  0), 50.0 %
Stockfish 20230128            :   4 (+  0,=  4,-  0), 50.0 %
CorChess 20230202             :   2 (+  0,=  2,-  0), 50.0 %
Charisma Blitz                :   4 (+  0,=  4,-  0), 50.0 %
Ethereal 14.00 NNUE           :  14 (+  8,=  6,-  0), 78.6 %
Stockfish 20230209            :   2 (+  0,=  1,-  1), 25.0 %
Berserk 20230130b             :   2 (+  0,=  2,-  0), 50.0 %
Charisma 250223               :  10 (+  1,=  9,-  0), 55.0 %
CorChess 20230226             :   6 (+  0,=  6,-  0), 50.0 %
Stockfish 20230227            :   2 (+  0,=  2,-  0), 50.0 %
Leptir 280223                 :   2 (+  0,=  2,-  0), 50.0 %


ShashChess 31 - download 
github:https://github.com/amchess/ShashChess/releases/tag/31

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