Polyfish is a UCI chess engine based on Stockfish. Rating CEDR=3726
It is identical to Stockfish with the added capability of handling Polyglot,
Polyfish supports two polyglot BIN books at the same time. The second book is only probed if the first book has no moves for the given position. The engine starts searching only if no move is found in either the first book or the second book.
Individual statistics: Polyfish 230202 - 312 games (+ 87,=224,- 1), 63.8 %
Critter 1.6a : 8 (+ 7,= 1,- 0), 93.8 %
SugaR AI 2.50 : 1 (+ 1,= 0,- 0), 100.0 %
Komodo 13.02 : 2 (+ 1,= 1,- 0), 75.0 %
RofChade 3.0 : 2 (+ 1,= 1,- 0), 75.0 %
StockfishMZ 170522 : 2 (+ 0,= 2,- 0), 50.0 %
Fisherov chess monk 1.2 : 12 (+ 0,= 12,- 0), 50.0 %
Demolito 2021-10-21 : 2 (+ 2,= 0,- 0), 100.0 %
Revenge 3.0 : 6 (+ 4,= 2,- 0), 83.3 %
Teal Oracle : 1 (+ 1,= 0,- 0), 100.0 %
Nebula-vortex 1.0 : 1 (+ 0,= 1,- 0), 50.0 %
DarkSister 1.9a : 1 (+ 0,= 1,- 0), 50.0 %
Berserk 10 : 2 (+ 1,= 1,- 0), 75.0 %
AI 27.0 : 1 (+ 0,= 1,- 0), 50.0 %
YuliGM PrO 4.0 : 1 (+ 0,= 1,- 0), 50.0 %
Seer 2.6 : 2 (+ 2,= 0,- 0), 100.0 %
Kayra 1.7 : 10 (+ 0,= 10,- 0), 50.0 %
Cool Iris 5.2 : 1 (+ 0,= 1,- 0), 50.0 %
RubiChess 20221203 : 2 (+ 0,= 2,- 0), 50.0 %
Cheese 3.1.1 : 2 (+ 2,= 0,- 0), 100.0 %
Kookaburra 1.03a : 10 (+ 0,= 10,- 0), 50.0 %
Little Goliath 3.16 : 2 (+ 2,= 0,- 0), 100.0 %
Dragon 3.2 : 10 (+ 2,= 8,- 0), 60.0 %
Uralochka 3.39d : 2 (+ 1,= 1,- 0), 75.0 %
Rebel 16.1 : 2 (+ 1,= 1,- 0), 75.0 %
Blue Marlin 15.6 : 11 (+ 1,= 10,- 0), 54.5 %
BrainLearn 21.1 : 10 (+ 0,= 9,- 1), 45.0 %
Koivisto 9.0 : 2 (+ 0,= 2,- 0), 50.0 %
Koivisto 9.0 Ipman : 2 (+ 1,= 1,- 0), 75.0 %
Stockfish 20230125 : 6 (+ 0,= 6,- 0), 50.0 %
Corchess 230125 : 2 (+ 0,= 2,- 0), 50.0 %
Viridithas 7.0.0 : 7 (+ 6,= 1,- 0), 92.9 %
Protej 0.6.4 : 6 (+ 6,= 0,- 0), 100.0 %
BlackCore 5.1 : 6 (+ 5,= 1,- 0), 91.7 %
Vafra 12.3 Cfish : 6 (+ 2,= 4,- 0), 66.7 %
CorChess 20230125 : 4 (+ 0,= 4,- 0), 50.0 %
Winter 2.0 : 6 (+ 6,= 0,- 0), 100.0 %
Eman 8.70 : 17 (+ 0,= 17,- 0), 50.0 %
Igel 3.4.0 : 8 (+ 2,= 6,- 0), 62.5 %
Stockfish 20230202 : 4 (+ 0,= 4,- 0), 50.0 %
ShashChess 28 : 16 (+ 0,= 16,- 0), 50.0 %
Smallbrain 7.0 : 6 (+ 2,= 4,- 0), 66.7 %
Charisma Light 2 : 6 (+ 0,= 6,- 0), 50.0 %
RukChess 3.0.15 NNUE2 : 2 (+ 2,= 0,- 0), 100.0 %
Stockfish 230202 : 2 (+ 0,= 2,- 0), 50.0 %
Stockfish 230125 Ivec : 2 (+ 0,= 2,- 0), 50.0 %
Bagatur 3.7 : 2 (+ 2,= 0,- 0), 100.0 %
Mess 0.1.0 : 2 (+ 2,= 0,- 0), 100.0 %
Koivisto 9.2 hotfix : 2 (+ 1,= 1,- 0), 75.0 %
CorChess 20230210 : 4 (+ 0,= 4,- 0), 50.0 %
Caissa 1.6 : 2 (+ 2,= 0,- 0), 100.0 %
Predator X5 : 2 (+ 0,= 2,- 0), 50.0 %
Stockfish 20230203 : 2 (+ 0,= 2,- 0), 50.0 %
Velvet 5.1.0 : 2 (+ 2,= 0,- 0), 100.0 %
Fat Fritz 2 : 10 (+ 3,= 7,- 0), 65.0 %
Patzer AI 020223 : 4 (+ 0,= 4,- 0), 50.0 %
Berserk 11 : 2 (+ 0,= 2,- 0), 50.0 %
Clover 3.3.1 : 2 (+ 2,= 0,- 0), 100.0 %
Caissa 1.6.3 : 2 (+ 2,= 0,- 0), 100.0 %
Rebel 16.2 : 10 (+ 2,= 8,- 0), 60.0 %
Stockfish 20230218 : 6 (+ 0,= 6,- 0), 50.0 %
Berserk 11.1 : 8 (+ 3,= 5,- 0), 68.8 %
Koivisto 9.2 : 10 (+ 3,= 7,- 0), 65.0 %
Charisma Blitz : 2 (+ 0,= 2,- 0), 50.0 %
Ethereal 14.00 NNUE : 10 (+ 1,= 9,- 0), 55.0 %
Charisma 250223 : 8 (+ 1,= 7,- 0), 56.2 %
CorChess 20230226 : 4 (+ 0,= 4,- 0), 50.0 %
github:https://github.com/khalid-a-omar/Polyfish/releases/tag/20230410
Rating CEDR=3720 (01.04.2023)
ShashChess is a free UCI chess engine derived from Stockfish family chess engines.
v.31.1:
Again refined Shashin theory
Updated and very refined testsuite
Stockfish patch
Apr 7, 2023
Depth Tweak and tuning
tunes reduction related parameters, and introduces more reduction on found good moves.
credit for this patch goes also to candirufish Yoshie2000 dubslow peregrineshahin Vizvezdenec
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 %
github:https://github.com/amchess/ShashChess/releases/tag/31.1
Rating CEDR=3716
BrainLearn is a free, powerful UCI chess engine derived from BrainFish. It is not a complete chess program and requires a UCI-compatible GUI (e.g. XBoard with PolyGlot, Scid, Cute Chess, eboard, Arena, Sigma Chess, Shredder, Chess Partner or Fritz) in order to be used comfortably.
Read the documentation for your GUI of choice for information about how to use Stockfish with it.
BrainLearn 23.1 - download
v.23.1:
Bug fix
Stockfish patch
Depth Tweak and tuning
tunes reduction related parameters, and introduces more reduction on found good moves.
credit for this patch goes also to candirufish Yoshie2000 dubslow peregrineshahin Vizvezdenec
Individual statistics: BrainLearn 19 - 260 games (+ 56,=197,- 7), 59.4 %
Stockfish 15 : 3 (+ 0,= 3,- 0), 50.0 %
Dragon 3 : 8 (+ 0,= 8,- 0), 50.0 %
Fisherov chess monk 1.2 : 25 (+ 0,= 24,- 1), 48.0 %
Revenge 3.0 : 2 (+ 1,= 1,- 0), 75.0 %
BigBallz 010922 : 8 (+ 2,= 5,- 1), 56.2 %
ProteusSF Piranha 220904 : 10 (+ 0,= 8,- 2), 40.0 %
Rebel 15.1a : 2 (+ 1,= 1,- 0), 75.0 %
Nebula-vortex 1.0 : 8 (+ 1,= 6,- 1), 50.0 %
Koivisto 8.16 : 4 (+ 3,= 1,- 0), 87.5 %
Dark Sister 1.9b : 2 (+ 1,= 1,- 0), 75.0 %
StockNemo 5.7.0.0 : 2 (+ 2,= 0,- 0), 100.0 %
Marvin 6.1.0 : 2 (+ 1,= 1,- 0), 75.0 %
Alexandria 3.0 : 2 (+ 2,= 0,- 0), 100.0 %
Berserk 10 : 8 (+ 3,= 5,- 0), 68.8 %
Caissa 1.1 : 2 (+ 2,= 0,- 0), 100.0 %
Fire NN 1072022 : 2 (+ 2,= 0,- 0), 100.0 %
Frozenight 5.1.0 : 2 (+ 2,= 0,- 0), 100.0 %
Lynx 0.12.0 : 2 (+ 2,= 0,- 0), 100.0 %
Trinket 3.0.0 : 2 (+ 2,= 0,- 0), 100.0 %
Stockfish 101022 Ivec : 4 (+ 0,= 4,- 0), 50.0 %
CorChess 101022 : 13 (+ 1,= 11,- 1), 50.0 %
Solista Attack 2 : 15 (+ 0,= 15,- 0), 50.0 %
Fatalii 0.3.1 : 2 (+ 2,= 0,- 0), 100.0 %
Francesca 0.32 : 2 (+ 1,= 1,- 0), 75.0 %
Halogen 11 : 11 (+ 5,= 6,- 0), 72.7 %
Polyfish 221009 : 12 (+ 0,= 12,- 0), 50.0 %
Mayhem 7.4 : 4 (+ 4,= 0,- 0), 100.0 %
RubiChess 20221001 : 12 (+ 4,= 8,- 0), 66.7 %
ShashChess 25 : 14 (+ 1,= 13,- 0), 53.6 %
Eman 8.40 : 23 (+ 0,= 23,- 0), 50.0 %
Smallbrain 6.0 : 5 (+ 5,= 0,- 0), 100.0 %
Stockfish 161022 : 16 (+ 0,= 16,- 0), 50.0 %
AI 27.0 : 1 (+ 0,= 1,- 0), 50.0 %
RapChess 2022-10-17 : 1 (+ 1,= 0,- 0), 100.0 %
BlackCore 2.0 : 1 (+ 1,= 0,- 0), 100.0 %
Viridithas 3.0.0 : 1 (+ 1,= 0,- 0), 100.0 %
Vafra 12.2 Cfish : 1 (+ 0,= 1,- 0), 50.0 %
ShashChess 25.1 : 1 (+ 0,= 1,- 0), 50.0 %
YuliGM PrO 4.0 : 1 (+ 0,= 1,- 0), 50.0 %
Stockfish 081022 : 6 (+ 1,= 4,- 1), 50.0 %
SugaR AI 131022 : 2 (+ 0,= 2,- 0), 50.0 %
Dark Sister 1.9d : 6 (+ 0,= 6,- 0), 50.0 %
CorChess 171022 : 2 (+ 0,= 2,- 0), 50.0 %
Fritz 18 Neuronal : 2 (+ 2,= 0,- 0), 100.0 %
pHoBiA 4.0 : 2 (+ 0,= 2,- 0), 50.0 %
Spectral Tactical 1.40 : 2 (+ 0,= 2,- 0), 50.0 %
Stockfish 14.1 : 2 (+ 0,= 2,- 0), 50.0 %
BrainLearn progress:
| Pl | Engine | CEDR | Score | Games | (%) |
| 18 | Brainlearn 20.1 vulkan | 3730.5 | 35.50 | 52 | 68.27 |
| 48 | BrainLearn 20 | 3716.4 | 321.00 | 490 | 65.51 |
| 68 | BrainLearn 21.1 | 3711.5 | 499.50 | 764 | 65.38 |
| 79 | BrainLearn 19 | 3709.6 | 154.00 | 259 | 59.46 |
| 126 | BrainLearn 19.2.1 | 3701.8 | 79.00 | 118 | 66.95 |
| 141 | BrainLearn 19.1 | 3699.1 | 51.00 | 84 | 60.71 |
| 151 | BrainLearn 19.2 | 3696.8 | 54.00 | 78 | 69.23 |
| 173 | BrainLearn 20.2 | 3694.2 | 280.50 | 458 | 61.24 |
| 184 | BrainLearn 18 | 3692.4 | 209.00 | 336 | 62.20 |
| 195 | BrainLearn 061122 | 3690.5 | 50.00 | 96 | 52.08 |
| 222 | BrainLearn 17 | 3681.8 | 150.00 | 264 | 56.82 |
| 242 | BrainLearn 21 | 3674.7 | 101.50 | 148 | 68.58 |
| 287 | BrainLearn 9.0 | 3611.6 | 13.50 | 18 | 75.00 |
BrainLearn 23.1 - download
github:https://github.com/amchess/BrainLearn/releases/tag/23
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