Nirvanachess

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|| [[image:Kalpasutra_Mahavira_Nirvana.jpg link="http://commons.wikimedia.org/wiki/File:Mahaviras_Nirvana_from_Kalpasutra.jpg"]] ||~ || **Nirvanachess**, (Nirvana)
an [[UCI]] compliant chess engine by [[Thomas Kolarik]], written in [[Cpp|C++]], first released in April 2013 <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=47750|Nirvanachess 1.0 Release]] by [[Thomas Kolarik]], [[CCC]], April 10, 2013</ref>. Nirvanachess applies a [[Principal Variation Search|principal variation search]] with a four bucket [[Transposition Table|transposition table]], [[Null Move Pruning|null move pruning]], [[Late Move Reductions|late move reduction]], and [[Futility Pruning|futility pruning]] and [[Razoring|razoring]] with [[CLOP]] optimized margins inside an [[Iterative Deepening|iterative deepening framework]] with [[Aspiration Windows|aspiration windows]], [[Move Ordering|move ordering]] improved by the [[Killer Heuristic|killer heuristics]]. Its [[Evaluation|evaluation]] uses [[Material|material]] and [[Piece-Square Tables|piece-squares tables]], and further places emphasis on [[Mobility|mobility]], [[Pawn Structure|pawn structure]] with focus on [[Passed Pawn|passed pawns]] and [[Pawn chain|pawn chains]], and [[King Safety|king safety]], considing [[King Safety#PawnStorm|pawn storms]], how many [[King Pattern#KingAttacks|squares around the king]] are attacked by how many attackers, and the quality of the [[King Safety#PawnShield|pawn shelter]] <ref>[[http://nirvanachess.blogspot.com/|Nirvanachess]]</ref>. Nirvana **2.0**, released in December 2014, was a complete rewrite using [[Bitboards|bitboards]] instead of a [[10x12 Board|10x12 board]] with an improved evaluation and a [[Parallel Search|parallel search]] using the [[Lazy SMP|lazy SMP]] approach <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=54671|Nirvanachess 2.0 Release]] by [[Thomas Kolarik]], [[CCC]], December 17, 2014</ref>. Nirvanachess **2.1** improved due to [[Singular Extensions#RestrictedSE|singular extensions]], [[Automated Tuning#LogisticRegression|logistic regression tuning]] aka [[Texel's Tuning Method]] of evaluation weights, as well as [[SPSA]] tuning for pruning margins <ref>[[http://nirvanachess.blogspot.de/2015/05/nirvanachess-21-release.html|Nirvanachess: Nirvanachess 2.1 Release]], May 04, 2015</ref> <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=56239|Nirvanachess 2.1 Release]] by [[Thomas Kolarik]], [[CCC]], May 05, 2015</ref>. ||
|| Mahavira's Nirvana <ref>[[https://en.wikipedia.org/wiki/Mahavira|Mahavira's]] [[https://en.wikipedia.org/wiki/Nirvana|Nirvana]] or [[http://en.wikipedia.org/wiki/Moksha|Moksha]]. Note the crescent shaped [[https://en.wikipedia.org/wiki/Siddhashila|Siddhashila]] (a place where all [[https://en.wikipedia.org/wiki/Siddha|Siddhas]] reside after Nirvana). Folio 53r from [[https://en.wikipedia.org/wiki/Kalpa_S%C5%ABtra|Kalpa Sūtra]] series, loose leaf manuscript, [[https://en.wikipedia.org/wiki/Patan,_Gujarat|Patan, Gujarat]], ca. 1472, [[https://en.wikipedia.org/wiki/Wikimedia_Commons|Wikimedia Commons]]</ref> ||~ ||^ ||
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=See also=
* [[Various Classifications#Metaphysics|Metaphysics]]

=Forum Posts=
==2013==
* [[http://www.talkchess.com/forum/viewtopic.php?t=47750|Nirvanachess 1.0 Release]] by [[Thomas Kolarik]], [[CCC]], April 10, 2013
* [[http://www.talkchess.com/forum/viewtopic.php?t=48186|Nirvanachess 1.1 Release]] by [[Thomas Kolarik]], [[CCC]], June 03, 2013
* [[http://www.talkchess.com/forum/viewtopic.php?t=49053|Nirvanachess 1.2 Release]] by [[Thomas Kolarik]], [[CCC]], August 22, 2013
* [[http://www.talkchess.com/forum/viewtopic.php?t=50039|Nirvanachess 1.3 Release]] by [[Thomas Kolarik]], [[CCC]], November 12, 2013
==2014==
* [[http://www.talkchess.com/forum/viewtopic.php?t=50839|Nirvanachess 1.4 Release]] by [[Thomas Kolarik]], [[CCC]], January 09, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?t=51500|Nirvanachess 1.5 Release]] by [[Thomas Kolarik]], [[CCC]], March 05, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?p=560787|Hyper Bullet Rating List]] by [[Thomas Kolarik]], [[CCC]], March 08, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?t=52041|Nirvanachess 1.6 Release]] by [[Thomas Kolarik]], [[CCC]], April 18, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?t=52846|Nirvanachess 1.7 Release]] by [[Thomas Kolarik]], [[CCC]], July 03, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?t=53448|Nirvanachess 1.8 Release]] by [[Thomas Kolarik]], [[CCC]], August 27, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?p=590030|Transposition Table Oddity]] by [[Thomas Kolarik]], [[CCC]], September 28, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?t=54671|Nirvanachess 2.0 Release]] by [[Thomas Kolarik]], [[CCC]], December 17, 2014
==2015 ...==
* [[http://www.talkchess.com/forum/viewtopic.php?t=56239|Nirvanachess 2.1 Release]] by [[Thomas Kolarik]], [[CCC]], May 05, 2015
* [[http://www.talkchess.com/forum/viewtopic.php?t=57948|Nirvanachess 2.2 Release]] by [[Thomas Kolarik]], [[CCC]], October 15, 2015
* [[http://www.talkchess.com/forum/viewtopic.php?t=61001|Nirvanachess 2.3 Release]] by [[Thomas Kolarik]], [[CCC]], July 31, 2016
* [[http://nirvanachess.blogspot.com/2017/08/nirvanachess-24-release.html|Nirvanachess 2.4 Release]] by [[Thomas Kolarik]], Nirvanachess , August 11, 2017 <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=64904|Nirvanachess 2.4 has been released]] by [[Graham Banks]], [[CCC]], August 15, 2017</ref>

=External Links=
==Chess Engine==
* [[http://nirvanachess.blogspot.com/|Nirvanachess]]
* [[http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?match_length=30&each_game=1&print=Details&each_game=1&eng=NirvanaChess%201.7%2064-bit#NirvanaChess_1_7_64-bit|NirvanaChess 1.7 64-bit]] in [[CCRL|CCRL 40/4]]
==Misc==
* [[https://en.wiktionary.org/wiki/nirvana|nirvana - Wiktionary]]
* [[https://en.wikipedia.org/wiki/Nirvana_%28disambiguation%29|Nirvana (disambiguation) from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Nirvana|Nirvana from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Nirvana_%28Buddhism%29|Nirvana (Buddhism) from Wikipedia]]
* [[Videos#Nirvana|Nirvana]] - [[https://en.wikipedia.org/wiki/Smells_Like_Teen_Spirit|Smells Like Teen Spirit]] (1991), [[https://en.wikipedia.org/wiki/YouTube|YouTube]] Video
> [[media type="youtube" key="hTWKbfoikeg" width="560"]]

=References= 
<references />
=What links here?= 
[[include page="Nirvanachess" component="backlinks" limit="40"]]
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