Nirvanachess

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Nirvanachess, (Nirvana) 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.

=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

2020 ...

 * Nirvanachess 2.5 Release by Thomas Kolarik, Nirvanachess, December 06, 2020
 * Nirvanachess 2.5 Release by Thomas Kolarik, CCC, December 07, 2020

=External Links=

Chess Engine

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

Misc

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

=References= Up one level