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Tuesday, May 23, 2017

Gogobello 1.2 - UCI chess engine. New version

Gogobello - UCI chess engine

Gogobello homepage

Author - Salvatore Giannotti (Italy)   

 Gogobello previous versions


 Gogobello 1.2 - download 

Chess engine: Symphysodon 220517

Rating JCER=3335

Author - Jose Perez

Stockfish 17052203 - new version!

Stockfish, chess engine UCI
Leader rating list JCER = 3387
🔬 Author: VoyagerOne

Timestamp: 1495416477 

Evasion Pruning Tweak 
Use moveCount to decide when to prune for evasion pruning 

LLR: 2.95 (-2.94,2.94) [0.00,5.00] 
Total: 24476 W: 4518 L: 4289 D: 15669 

LLR: 2.96 (-2.94,2.94) [0.00,5.00] 
Total: 18362 W: 2476 L: 2298 D: 13588 

Bench: 6469989 
Closes #1120 
⭐⭐⭐   Stockfish 17052203 - download


Chess engine: asmFish 2017-05-21

Monday, May 22, 2017

Sunday, May 21, 2017

Saturday, May 20, 2017

Chess opening book: Ranomi 170502 (bin file)


Chess engines: CorCfish Extended 1.3 200517

Chess engine: Stockfish BYO Edition 2017a

Chess Engine: BrainFish 170518

BrainFish - UCI chess engine

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 Stockfish regarding the evaluation, only at a much higher skill level. Pondering is only active after the last move out of the book has been played.

The lines in Cerebellum_light.bin are in some cases reaching the late middlegame and endgame.

BrainFish is licensed unter the GPL, which includes the access code to the general book format.

 BrainFish 170518 - download

Shark 170518 (Stockfish clone)

Shark 170518 bf - download

Orka 170518 (Stockfish clone) - new version

Rating JCER=3339

Orka 170518 - download

Chess engine: Goby 170517

McBrain 2.3 wins JCER Test Tournament, 2017.05.15 - 2017.05.18

Temp 3' + 3" Hardware: Intel Core i3-3217U CPU @ 1.80GHz with 3,9 GB Memory , Windows 10 64-bit
342 Tournament games download, GUI-Arena 3.5.1161.651 JCER games download,  until 31.12.2016
20.863 JCER games download (from 01.01.2017)  JCER League
Book: Perfect 2016,     Games, engines, book - download       Table created - Scid vs PC

Thursday, May 18, 2017

Stockfish 17051803_snicolet2 - new version!

Stockfish, chess engine UCI
Leader rating list JCER = 3387
🔬 Author: snicolet

Timestamp: 1495070683 

Do check analysis later in the game 

The previous patch has added a fraction of the king danger score to the endgame score of the tapered eval, so it seems natural to perform the king danger computation later in the endgame. 

With this patch we extend the limit of such check analysis down to the material of Rook+Knight, when we have at least two pieces attacking the opponent king zone. 

Passed STC: 
LLR: 2.95 (-2.94,2.94) [0.00,5.00] 
Total: 7446 W: 1409 L: 1253 D: 4784 

and LTC: 
LLR: 2.96 (-2.94,2.94) [0.00,5.00] 
Total: 14234 W: 1946 L: 1781 D: 10507 

Bench: 5975183 
Closes #1121 
⭐⭐⭐   Stockfish 17051803_snicolet2 - download

Bagatur 1.5a - UCI chess engine. New version!

Bagatur - UCI chess engines
AuthorKrasimir I. Topchiyski 


Website Bagatur

Rating JCER=2124

 Bagatur 1.5a download

Stockfish 17051803_snicolet - new version!

Stockfish, chess engine UCI
Leader rating list JCER = 3387
🔬 Author: snicolet

Timestamp: 1495070387 

Use a fraction of king danger in endgame score 

When SF has an attack on the opponent king in one flank, the huge 
midgame -> endgame gradient of the tapered eval prevents us to properly 
evaluate neutral exchanges on the other flank as the current king 
danger score is a pure midgame term. This may affect SF's ability to 
switch to defense in some positions. We add a small contribution 
of the king danger to the endgame score to limit this effect. 
Passed STC: 
LLR: 2.96 (-2.94,2.94) [0.00,5.00] 
Total: 12719 W: 2371 L: 2192 D: 8156 

And LTC: 
LLR: 2.95 (-2.94,2.94) [0.00,5.00] 
Total: 31293 W: 4194 L: 3974 D: 23125 

Bench: 5961548
Closes #1118
⭐⭐⭐   Stockfish 17051803_snicolet - download

UCI chess engine: Alcibiades 0.3.0TM

Alcibiades - UCI chess engine
Author : Evgeni Pandurski

JCER Rating=1882

Alcibiades 0.3.0TM - download

Stockfish 17051803 - new version!

Stockfish, chess engine UCI
Leader rating list JCER = 3387
🔬 Author: Joost VandeVondele

Timestamp: 1495070101 

Fix memory access in Search::clear() 

Fixes a bug in Search::clear, where the filling of CounterMoveStats&, overwrote (currently presumably unused) memory because sizeof(cm) returns the size in bytes, whereas elements was needed. 

No functional change
Closes #1119 
⭐⭐⭐   Stockfish 17051803 - download

Chess engine: Goby 170512

Stockfish 17051604 - new version!

Stockfish, chess engine UCI
Leader rating list JCER = 3387
🔬 Author: snicolet 

Timestamp: 1494901717 

Limit king ring to eight squares 

In current master the size of the king ring varies abruptly from eight 
squares when the king is in g8, to 12 squares when it is in g7. Because 
the king ring is used for estimating attack strength, this may lead to 
an overestimation of king danger in some positions. This patch limits 
the king ring to eight squares in all cases. 

Passed STC: 
LLR: 2.97 (-2.94,2.94) [0.00,5.00] 
Total: 9244 W: 1777 L: 1611 D: 5856 

and LTC: 
LLR: 2.96 (-2.94,2.94) [0.00,5.00] 
Total: 87121 W: 11765 L: 11358 D: 63998 

Bench: 6121121 
Closes #1115 

⭐⭐⭐   Stockfish 17051604 - download