Changes

'''Nirvanachess''', (Nirvana)<br/>

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>.

=Forum Posts=

* [https://en.wikipedia.org/wiki/Nirvana Nirvana from Wikipedia]

* [https://en.wikipedia.org/wiki/Nirvana_%28Buddhism%29 Nirvana (Buddhism) from Wikipedia]

: {{#evu:https://www.youtube.com/watch?v=hTWKbfoikeg|alignment=left|valignment=top}}

[[Category:UCI]]

[[Category:Metaphysics]]