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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. P Engine Jcer Score 1 2 3 4 5 6 7 8 9 0 Chg 1: Laser 1.5 2853 11.5 / 18 XX 01 1= == 01 == == 1= =1 11 +23 2: Senpai 2.0 2919 10.5 / 18 10 XX 01 == =0 01 =1 11 1= == -5 3: Vajolet2 2.5 2838 10.5 / 18 0= 10 XX =1 == == == 10 1= 11 +18 4: Ice3 658 2869 10.0 / 18 == == =0 XX 1= =1 =1 == == == +5 5: SmarThink 1.97 2818 9.0 / 18 10 =1 == 0= XX == =0 01 1= == +9 6: Pedone 1.7 2841 8.5 / 18 == 10 == =0 == XX 11 =0 =0 == -2 7: Kohai 1.0 2844 8.5 / 18 == =0 == =0 =1 00 XX =1 01 =1 -4 8: Wasp 2.60 2820 8.5 / 18 0= 00 01 == 10 =1 =0 XX 11 == +4 9: ChessBrainVB 3.61

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

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. P Engine Jcer Score 1 2 3 4 5 6 7 8 9 0 Chg 1: Chess22k 1.6 2602 12.5 / 18 XX 10 0= 11 1= == 1= 11 10 11 +41 2: Sctr 1.1f 2858 11.5 / 18 01 XX 10 == 00 1= 1= =1 11 11 -32 3: Tornado 8 2644 11.0 / 18 1= 01 XX =0 =1 10 == 11 =0 11 +14 4: Murka 3 2637 10.5 / 18 00 == =1 XX =1 =0 10 == 11 11 +11 5: Gnucheese 1.00 2602 10.0 / 18 0= 11 =0 =0 XX 0= 01 11 1= 1= +18 6: Baron 3.42 2603 9.5 / 18 == 0= 01 =1 1= XX =1 01 =0 01 +13 7: Scorpio 2.78 2604 9.5 / 18 0= 0= == 01 10 =0 XX == 11 11 +13 8: Rhetoric 1.4.3 2567 7.0 / 18 00 =0 00 == 00 10 == XX 1= 11 -2 9: Ruydos 1.0.27 2572 6.5 / 18 01 00 =1

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

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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R Engine Author Jcer Score 1 2 3 4 5 6 7 8 9 0 S-B 01 Chess22k 1.6 Evgeniy Korniloff 2602 9.5/12 · · 0 1 1 1= == 11 1 1 1  51,25  02 Tornado 8 Engin Üstün 2644 8.0/12 1 · · = 0 = 1 11 = =0 11  40,00  03 Murka 3   2637 8.0/12 0 = · · == =1 = = 1 11 1  38,75  04 Sctr 1.1f Can Cetin & Dogac Eldenk 2858 8.0/12 0 1 == · · 0 1 = 1= 11 1  38,25  05 Gnucheese 1.00   2602 6.5/12 0= = =0 1 · · 0 1 01 1 1  35,25  06 Baron 3.42 Richard Pijl 2603 5.5/12 == 0 = 0 1 · · 0 =1 = 01  30,25  07 Rhetoric 1.4.3 Alberto Sanjuan 2567 5.5/12 00 00 = = 0 1 · · = 1 11  21,50  08 Scorpio 2.78 Daniel Shawul 2604 5.0/12 0 = 0 0= 10 =0 = · · 1 1  24,00  09 Ruydos 1.0.27 Alvaro Begue & Jose Manuel Moran 2572 2.5/12 0 =1 00 00 0 = 0 0 · · =  15,50  10 ProDeo 2.6 Ed Schröder 2577 1.5/12 0 00 0 0 0 10 00 0 = · ·  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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R Engine Author JCER Score Va Pe Ic La Se Sm Wa Ko Al Ch S-B 01 Vajolet2 2.5 Belli Marco 2838 6.0/9 · = = 0 1 = 1 = 1 1  24,75  02 Pedone 1.7 Fabio Gobbato 2841 5.5/9 = · = = 1 = = 1 = =  24,00  03 Ice3 658 Thomas Petzke 2869 5.0/9 = = · = = 1 = = = =  22,25  04 Laser 1.5 Jeffrey An and Michael An 2853 5.0/9 1 = = · 0 0 1 = 1 =  22,00  05 Senpai 2.0 Fabien Letouzey 2919 5.0/9 0 0 = 1 · = 1 = = 1  20,25  06 SmarThink 1.97 Sergei Markoff 2818 4.5/9 = = 0 1 = · 0 = = 1  19,75  07 Wasp 2.60 John Stanback 2820 4.0/9 0 = = 0 0 1 · = = 1  16,25  08 Kohai 1.0 Fabien Letouzey, Michael Byrne 2844 3.5/9 = 0 = = = = = · = 0  16,50  09 Alfil 15.8 Enrique Sánchez Acosta 2871 3.5/9 0 = = 0 = = = = · =  15,25  10 ChessBrainVB 3.61 Evgeniy Korniloff 2829 3.0/9 0 = = = 0 0 0 1 = ·  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 boo

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/

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

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R Engine Author JCER Score Sc Ch To Mu Gn Sc Rh Ba Ru Pr S-B 01 Sctr 1.1f Can Cetin & Dogac Eldenk 2858 4.5/6 · 1 = 0 1 1 1  12,00  02 Chess22k 1.6 Evgeniy Korniloff 2602 4.5/6 · 0 1 1 1 = 1  11,00  03 Tornado 8 Engin Üstün 2644 4.0/6 0 1 · = 1 = 1  10,50  04 Murka 3 2637 4.0/6 = · = = = 1 1  8,25  05 Gnucheese 1.00 2602 3.0/6 1 0 = = · 0 1  9,50  06 Scorpio 2.78 Daniel Shawul 2604 3.0/6 0 0 1 · = = 1  6,50  07 Rhetoric 1.4.3 Alberto Sanjuan 2567 3.0/6 0 0 = = · 1 1  5,50  08 Baron 3.42 Richard Pijl 2603 2.0/6 0 = = = · = 0  6,25  09 Ruydos 1.0.27 Alvaro Begue & Jose Manuel Moran 2572 1.0/6 0 = 0 0 0 = ·  3,00  10 ProDeo 2.6 Ed Schröder 2577 1.0/6 0 0 0 0 0 1 ·  2,00