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GerdIsenberg GerdIsenberg Nov 29, 2015

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**[[Home]] * [[Engines]] * JikChess**

**JikChess**,
a [[Chess Engine Communication Protocol]] compliant chess engine by [[Janne I. Kokkala]], written in [[Cpp|C++11]]. Its development started in early 2013, and the first version was released in November 2014 <ref>[[http://koti.kapsi.fi/jik/jikchess/#history|JikChess - History]]</ref>.

=Features=
<ref>based on [[http://koti.kapsi.fi/jik/jikchess/#technical|JikChess - Technical]]</ref>
==Search==
* [[Iterative Deepening]]
* [[Aspiration Windows]]
* [[Alpha-Beta]] [[Principal Variation Search|PVS]] 
* [[Selectivity]]
** [[Null Move Pruning]]
** [[Late Move Reductions]]
** [[Futility Pruning#Extendedfutilitypruning|Extended Futility Pruning]]
** [[Quiescence Search]] with [[Captures]] and [[Promotions]] only
** [[Check Extensions]]
** [[Extensions#FractionalExtensions|Fractional Ply]] [[PV Extensions]]
* [[Move Ordering]]
** [[Transposition Table]]
** [[Captures]] by [[Static Exchange Evaluation|SEE]]
** [[Killer Heuristic]]
** [[Internal Iterative Deepening]]

==Evaluation==
* [[Evaluation#Linear|Linear Combination]] of Numerical Positional Features
* [[Tapered Eval]]
* [[Pawn Hash Table]]
* [[Automated Tuning]]
** [[Automated Tuning#LogisticRegression|Logistic Regression]] (Simiar to [[Texel's Tuning Method]])
** [[https://en.wikipedia.org/wiki/Regularization_%28mathematics%29|Regularization]] - [[https://en.wikipedia.org/wiki/Prior_probability|Prior]] added to the [[https://en.wikipedia.org/wiki/Loss_function|Cost Function]] (encourages unimportant parameters to become zero)

==Misc==
* [[PolyGlot]] [[Opening Book]]
* [[Gaviota Tablebases]]

=Forum Posts=
* [[http://www.talkchess.com/forum/viewtopic.php?t=54598|JikChess 0.01 by Janne I. Kokkala]] by [[http://www.talkchess.com/forum/profile.php?mode=viewprofile&u=881|Ruxy Sylwyka]], [[CCC]], December 09, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?t=58016|JikChess 0.02 released]] by [[Graham Banks]], [[CCC]], October 22, 2015

=External Links=
* [[http://koti.kapsi.fi/jik/jikchess/|JikChess chess engine]]
* [[http://www.computerchess.org.uk/ccrl/4040/cgi/engine_details.cgi?print=Details&each_game=1&eng=JikChess%200.02%2064-bit|JikChess 0.02 64-bit]] in [[CCRL|CCRL 40/40]]

=References= 
<references />
=What links here?= 
[[include page="JikChess" component="backlinks" limit="20"]]
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