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Showing posts from January, 2018

Official release version of Stockfish 9

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Stockfish, chess engine UCI

Rating JCER = 3389


Stockfish 9 - download


Laser 1.5 wins 3 League JCER, edition 01/2018 ( Temp - 60').

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Laser 1.5 1.6 wins 3 League JCER, edition 01/2018 ( Temp - 60'). Congratulations for: Jeffrey An and Michael An!

Promoted to 2 League: Laser and Senpai.
Demoted to 4 League: ChessBrainVb and Alfil.

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EngineJcer Score 1234567890Chg 1: Laser 1.5 2853 11.5 / 18 XX011===01====1==111+23 2: Senpai 2.0 2919 10.5 / 18 10XX01===001=1111===-5 3: Vajolet2 2.5 2838 10.5 / 18 0=10XX=1======101=11+18 4: Ice3 658 2869 10.0 / 18 =====0XX1==1=1======+5 5: SmarThink 1.97 2818 9.0 / 18 10=1==0=XX===0011===+9 6: Pedone 1.7 2841 8.5 / 18 ==10===0==XX11=0=0==-2 7: Kohai 1.0 2844 8.5 / 18 ===0===0=100XX=101=1-4 8: Wasp 2

Stockfish 18012814_Rocky640 - new version!

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Stockfish, chess engine UCI

Rating JCER = 3389
🔬 Author: syzygy1

Timestamp: 1517147805 

Limit the king distance factor when evaluating passed pawns (#1373) 

Limit the king distance factor when evaluating passed pawns 
Passed STC 

LLR: 3.31 (-2.94,2.94) [0.00,5.00] 
Total: 23987 W: 5550 L: 5281 D: 13156 
and LTC 

LLR: 2.97 (-2.94,2.94) [0.00,5.00] 
Total: 16926 W: 3014 L: 2820 D: 11092 

Bench: 5059457

⭐⭐⭐   Stockfish 18012814_Rocky640  - download

Chess Engine: BrainFish 180128 and book: Cerebellum Light 180128

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BrainFish - UCI chess engine
JCER Rating=3378

Information from the author:
Brainfish is a standard Stockfish chess engine extended by a general book format that is capable of handling a reduced part of Cerebellum, which is an innovative chess opening and playing book. In Brainfish, the book moves are only used in engine games, not in analysis mode.

All moves in the published book Cerebellum_light.bin generated by Cerebellum were calculated by using
Stockfish as analysis engine, without using statistics. Then those moves where recalulated by the Cerebellum Library using a graph algorithm that makes all scores in the library consistant. Consistant scores means for example, in case the starting position has a score of 0.2 and a best move is 1.e4, the position after 1.e4 must have the score -0.2. Additionally, some others properties are found, like the best main line of a position and possible Transitions.

Hence, when Brainfish is playing moves that are in the Cerebellum book, it plays like Sto…

Nemorino 4.5 - UCI chess engine. New version!

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Nemorino - UCI chess engine
Author - Christian Günther

Rating JCER=2884

Nemorino 4.5 download


Chess22k 1.6 wins 6 League JCER, edition 01/2018 ( Temp - 60').

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Chess22k 1.6 wins 6 League JCER, edition 01/2018 ( Temp - 60'). Congratulations for: Evgeniy Korniloff!

Promoted to 5 League: Chess22k and Sctr.
Demoted to 7 League: Ruydos and ProDeo.


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EngineJcer Score 1234567890Chg 1: Chess22k 1.6 2602 12.5 / 18 XX100=111===1=111011+41 2: Sctr 1.1f 2858 11.5 / 18 01XX10==001=1==11111-32 3: Tornado 8 2644 11.0 / 18 1=01XX=0=110==11=011+14 4: Murka 3 2637 10.5 / 18 00===1XX=1=010==1111+11 5: Gnucheese 1.00 2602 10.0 / 18 0=11=0=0XX0=01111=1=+18 6: Baron 3.42 2603 9.5 / 18 ==0=01=11=XX=101=001+13 7: Scorpio 2.78 2604 9.5 / 18 0=0===0110=0XX==11

Stockfish 18012814 - new version!

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Stockfish, chess engine UCI

Rating JCER = 3389
🔬 Author: syzygy1

Timestamp: 1517146807 

This modifies the in-search TB probing to continue searching for a mate "behind" a TB win (or loss). (#1285) 

It does the following: 
- If a TB win or loss value allows an alpha or beta cutoff, the cutoff is taken. 
- Otherwise, the search of the current subtree continues. In PV nodes, the final value returned is adjusted to reflect that the position is a TB win (or loss). 

The patch also fixes a potential problem caused by root_probe() and root_probe_wdl() dirtying the root-move scores. 

This patch removes the limitation of current master that a mate is never found if the root position is not yet in the TBs, but the path to mate at some point enters the TBs. The patch is intended to preserve the efficiency and effectiveness of the current TB probing approach. 

No functional change (withouth TB)
⭐⭐⭐   Stockfish 18012814 - download

Only for donors added: 56 chess engines and 2 book

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Only for donors added: 56 chess engines and 2 book:

andscacs092165, andscacs093, Arasan 20.4, Arasan 20.4.1, asmfish-012018+mf, atlas 3.90, atlas 3.91, baron 3.42, BrainFish 180106, BrainFish 180113, BrainFish 180124, BugChess 2.41, ChessV 2.1, Clever-girl-rev160, Dimitri 393, Dorpsgek-Eves-Temptation, Ethereal 8.80, galjoen v0.37.2, greko 2017, Hactar 0.9.0, OpenTal 1.1, Pedone 1.7, Popochin 4.0, Raubfisch ME262_GTZ16b, Raubfisch ME262_GTZ16b1, Raubfisch ME262_GTZ16b3, Raubfisch X37b, Raubfisch X37b1, Raubfisch X37b3, RomiChessP3nOK, RubiChess-0.7-graham, Schooner 1.8, Shield 2.1, Skiull 0.3, snowy 0.2, Soberango 0.12.0, sting-sf-95, sting-sf-96, stockfish 18010113, stockfish 18010113b, stockfish 18010422, stockfish 18011308, stockfish 18011308_Ilvec, stockfish 18011309, stockfish 18011309_Costalba, stockfish 18012314, stockfish 18012314_Nicolet, stockfish 18012314_Vijlbrief, stockfish 18012416, SugaR.XPrO 220118, texel108a8, TogaII401, Vajolet2 2.5, waxman 2017, Zevra v1.7.1 r563, Ze…

ChessV 2.1 - universal chess program with a graphical user interface!

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ChessV 2.1 - download



ChessV is a free, open-source universal chess program with a graphical user interface, sophisticated AI engine, and other features of traditional Chess programs. 
As a "universal" chess program, it not only plays orthodox Chess, it is also capable of playing games reasonbly similar to Chess. 





6 League JCER, edition 01/2018 P-60' - after round 12

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REngineAuthorJcerScore1234567890S-B01Chess22k 1.6 Evgeniy Korniloff26029.5/12· ·0111===11111 51,25 02Tornado 8 Engin Üstün26448.0/121· ·=0=111==011 40,00 03Murka 3 26378.0/120=· ·===1==1111 38,75 04Sctr 1.1f Can Cetin & Dogac Eldenk28588.0/1201==· ·01=1=111 38,25 05Gnucheese 1.0026026.5/120===01· ·010111 35,25 06Baron 3.42 Richard Pijl26035.5/12==0=01· ·0=1=01 30,25 07Rhetoric 1.4.3Alberto Sanjuan25675.5/120000==01· ·=111 21,50 08Scorpio 2.78 Daniel Shawul26045.0/120=00=10=0=· ·11 24,00 09Ruydos 1.0.27 Alvaro Begue & Jose Manuel Moran25722.5/120=100000=00· ·= 15,50 10ProDeo 2.6 Ed Schröder25771.5/1200000010000=· · 6,75 

Atlas 3.91 - UCI chess engine. New version (bug fixed)!

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Atlas - UCI chess engines
Author: Andreas Manzanares 
Rating JCER=2661

Atlas 3.91 - download

All chess engines downloadable on the site


Chess engine: Zevra 1.8 build 583

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Zevra - Rating JCER=1761
Author - Oleg Smirnov 

Zevra 1.8 b583 - download

Chess engine: Popochin 4.0

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Popochin - winboard chess engine
Author: Miguel Izquierdo

Popochin 4.0 - download


3 League JCER, edition 01/2018 P-60' - after round 9

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REngineAuthorJCERScoreVaPeIcLaSeSmWaKoAlChS-B01Vajolet2 2.5 Belli Marco28386.0/9·==01=1=11 24,75 02Pedone 1.7 Fabio Gobbato28415.5/9=·==1==1== 24,00 03Ice3 658 Thomas Petzke28695.0/9==·==1==== 22,25 04Laser 1.5 Jeffrey An and Michael An28535.0/91==·001=1= 22,00 05Senpai 2.0 Fabien Letouzey29195.0/900=1·=1==1 20,25 06SmarThink 1.97 Sergei Markoff28184.5/9==01=·0==1 19,75 07Wasp 2.60 John Stanback28204.0/90==001·==1 16,25 08Kohai 1.0 Fabien Letouzey, Michael Byrne28443.5/9=0=====·=0 16,50 09Alfil 15.8 Enrique Sánchez Acosta28713.5/90==0====·= 15,25 10ChessBrainVB 3.61Evgeniy Korniloff28293.0/90===0001=· 13,00 

Chess engine: Raubfisch ME262 GTZ16b3

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Raubfisch is an engine derived from Stockfish and Torpedo 1.1 XJR (private engine by Frank Karl Werner and Max Fehler)

Rating JCER - 3379

Raubfisch ME262 GTZ16b3 - download

Stockfish 18012416 - new version!

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Stockfish, chess engine UCI

Rating JCER = 3389
🔬 Author: Mibere

Timestamp: 1516809244 

Top CPU Contributors as of January 2018 (#1367) 

No functional change.
⭐⭐⭐   Stockfish 18012416 - download

Chess engine: Raubfisch X37b3

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Raubfisch is an engine derived from Stockfish and Torpedo 1.1 XJR (private engine by Frank Karl Werner and Max Fehler)

Rating JCER - 3379

Raubfisch X37b3 - download

Chess Engine: BrainFish 180113 and book: Cerebellum Light 180113

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BrainFish - UCI chess engine
JCER Rating=3378

Information from the author:
Brainfish is a standard Stockfish chess engine extended by a general book format that is capable of handling a reduced part of Cerebellum, which is an innovative chess opening and playing book. In Brainfish, the book moves are only used in engine games, not in analysis mode.

All moves in the published book Cerebellum_light.bin generated by Cerebellum were calculated by using
Stockfish as analysis engine, without using statistics. Then those moves where recalulated by the Cerebellum Library using a graph algorithm that makes all scores in the library consistant. Consistant scores means for example, in case the starting position has a score of 0.2 and a best move is 1.e4, the position after 1.e4 must have the score -0.2. Additionally, some others properties are found, like the best main line of a position and possible Transitions.

Hence, when Brainfish is playing moves that are in the Cerebellum book, it plays like Sto…

Stockfish 18012314_Nicolet - new version!

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Stockfish, chess engine UCI

Rating JCER = 3389
🔬 Author: Stéphane Nicolet

Timestamp: 1516714005 
Contempt 20 
Set the default contempt value of Stockfish to 20 centipawns. 
The contempt feature of Stockfish tries to prevent the engine from simplifying the position too quickly when it feels that it is very slightly behind, instead keeping the tension a little bit longer. 

Various tests in November 2017 have proved that our current imple- mentation works well against SF7 (which is about 130 Elo weaker than current master) and than the Elo gain is an increasing function of contempt, going (against SF7) from +0 Elo when contempt is set at zero centipawns, to +30 Elo when contempt is 40 centipawns. 

This november discussion left open the decision of which "default" value for contempt we should use for Stockfish, taking into account the various uses ofStockfish (opening preparation for humans, computer online tournaments,analysis tool for web pages, human/computer play, etc). 

This pull …

6 League JCER, edition 01/2018 P-60' - after round 6

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REngineAuthorJCERScoreScChToMuGnScRhBaRuPrS-B01Sctr 1.1f Can Cetin & Dogac Eldenk28584.5/6·1=0111 12,00 02Chess22k 1.6 Evgeniy Korniloff26024.5/6·0111=1 11,00 03Tornado 8 Engin Üstün26444.0/601·=1=1 10,50 04Murka 3 26374.0/6=·===11 8,25 05Gnucheese 1.0026023.0/610==·01 9,50 06Scorpio 2.78 Daniel Shawul26043.0/6001·==1 6,50 07Rhetoric 1.4.3Alberto Sanjuan25673.0/600==·11 5,50 08Baron 3.42 Richard Pijl26032.0/60===·=0 6,25 09Ruydos 1.0.27 Alvaro Begue & Jose Manuel Moran25721.0/60=000=· 3,00 10ProDeo 2.6 Ed Schröder25771.0/6000001· 2,00

Stockfish 18012314_Vijlbrief - new version!

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Stockfish, chess engine UCI

Rating JCER = 3389
🔬 Author: Tom Vijlbrief 

Timestamp: 1516713305 

Make razor margin depth independent 

STC: 
LLR: 2.95 (-2.94,2.94) [-3.00,1.00] 
Total: 37171 W: 6680 L: 6587 D: 23904 

LTC: 
LLR: 2.95 (-2.94,2.94) [-3.00,1.00] 
Total: 11632 W: 1574 L: 1442 D: 8616 

bench: 5098576 

⭐⭐⭐   Stockfish 18012314_Vijlbrief - download