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Chess engine ShashChess 33 (Windows, Linux and Mac)

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ShashChess - UCI chess engine.
Rating CEDR=3717 (01.06.2023)

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

v.33:
Deeply revised Shashin theory
Stockfish patch
Remove optimism multiplier in nnue eval calculation
The same formula had passed SPRT against an earlier version of master.

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 rating progress:
Engine Rating Score Games (%)
ShashChess 25 3717.4 139.50 224 62.28
ShashChess 23.1.1 3717.4 101.50 142 71.48
ShashChess 26.1 3707.7 71.00 110 64.55
ShashChess 25.2 3707.6 93.50 162 57.72
ShashChess 28 3704.0 315.50 504 62.60
ShashChess GZ 3701.8 351.00 542 64.76
ShashChess 25.4 3700.9 119.50 191 62.57
ShashChess 26 3700.4 327.50 509 64.34
ShashChess 30 3698.9 206.50 340 60.74
ShashChess 22 3695.4 102.00 184 55.43
ShashChess 24 3694.8 278.50 436 63.88
ShashChess 29.1 3694.2 178.50 294 60.71
ShashChess 27 3692.9 121.50 183 66.39
ShashChess 31.1 3692.7 171.50 267 64.23
ShashChess 32 3692.5 172.50 282 61.17
ShashChess 27.2 3689.4 157.00 229 68.56
ShashChess 23 3683.1 115.50 174 66.38
ShashChess 26.2 3681.5 374.00 595 62.86
ShashChess 27.1 3678.8 70.50 116 60.78


ShashChess 33 - download 

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