Nirvanachess

an UCI compliant chess engine by Thomas Kolarik, written in C++, first released in April 2013. Nirvanachess applies a principal variation search with a four bucket transposition table, null move pruning, late move reduction, and futility pruning and razoring with CLOP optimized margins inside an iterative deepening framework with aspiration windows, move ordering improved by the killer heuristics. Its evaluation uses material and piece-squares tables, and further places emphasis on mobility, pawn structure with focus on passed pawns and pawn chains, and king safety, considing pawn storms, how many squares around the king are attacked by how many attackers, and the quality of the pawn shelter. Nirvana **2.0**, released in December 2014, was a complete rewrite using bitboards instead of a 10x12 board with an improved evaluation and a parallel search using the lazy SMP approach. Nirvanachess **2.1** improved due to singular extensions, logistic regression tuning aka Texel's Tuning Method of evaluation weights, as well as SPSA tuning for pruning margins. || toc =See also=
 * Home * Engines * Nirvanachess**
 * [[image:Kalpasutra_Mahavira_Nirvana.jpg link="http://commons.wikimedia.org/wiki/File:Mahaviras_Nirvana_from_Kalpasutra.jpg"]] ||~ || **Nirvanachess**, (Nirvana)
 * Mahavira's Nirvana ||~ ||^ ||
 * Metaphysics

=Forum Posts=

2013

 * [|Nirvanachess 1.0 Release] by Thomas Kolarik, CCC, April 10, 2013
 * [|Nirvanachess 1.1 Release] by Thomas Kolarik, CCC, June 03, 2013
 * [|Nirvanachess 1.2 Release] by Thomas Kolarik, CCC, August 22, 2013
 * [|Nirvanachess 1.3 Release] by Thomas Kolarik, CCC, November 12, 2013

2014

 * [|Nirvanachess 1.4 Release] by Thomas Kolarik, CCC, January 09, 2014
 * [|Nirvanachess 1.5 Release] by Thomas Kolarik, CCC, March 05, 2014
 * [|Hyper Bullet Rating List] by Thomas Kolarik, CCC, March 08, 2014
 * [|Nirvanachess 1.6 Release] by Thomas Kolarik, CCC, April 18, 2014
 * [|Nirvanachess 1.7 Release] by Thomas Kolarik, CCC, July 03, 2014
 * [|Nirvanachess 1.8 Release] by Thomas Kolarik, CCC, August 27, 2014
 * [|Transposition Table Oddity] by Thomas Kolarik, CCC, September 28, 2014
 * [|Nirvanachess 2.0 Release] by Thomas Kolarik, CCC, December 17, 2014

2015 ...

 * [|Nirvanachess 2.1 Release] by Thomas Kolarik, CCC, May 05, 2015
 * [|Nirvanachess 2.2 Release] by Thomas Kolarik, CCC, October 15, 2015
 * [|Nirvanachess 2.3 Release] by Thomas Kolarik, CCC, July 31, 2016
 * [|Nirvanachess 2.4 Release] by Thomas Kolarik, Nirvanachess, August 11, 2017

=External Links=

Chess Engine

 * [|Nirvanachess]
 * [|NirvanaChess 1.7 64-bit] in CCRL 40/4

Misc
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 * [|nirvana - Wiktionary]
 * [|Nirvana (disambiguation) from Wikipedia]
 * [|Nirvana from Wikipedia]
 * [|Nirvana (Buddhism) from Wikipedia]
 * Nirvana - [|Smells Like Teen Spirit] (1991), [|YouTube] Video

=References= =What links here?= include page="Nirvanachess" component="backlinks" limit="40"
 * Up one level**