422
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m
added category MIT, engine itself is MIT license.
===[[BMI2#PDEPBitboards|PEXT/PDEP Bitboards]]===
Arasan '''20.3''', released in November 2017, performs [[BMI2#PDEPBitboards|PEXT/PDEP Bitboards]] if compiled for the [[BMI2]] instruction set <ref>[http://www.talkchess.com/forum/viewtopic.php?t=65636 Arasan 20.3] by [[Jon Dart]], [[CCC]], November 05, 2017</ref> to replace [[Magic Bitboards#Fancy|Fancy Magic Bitboards]] in looking up [[Sliding Piece Attacks|sliding piece attacks]] <ref>arasan_source20.3.zip/src/attacks.h</ref>
<span id="Tuning"></span>
==[[Search]]==
** [[Quiescence Search]]
==[[Evaluation]]==
===[[NNUE]]===
Arasan '''23.0''', released in September 2021, uses a [[Stockfish]] 13 compatible [[NNUE]] - trained by selfplay positions - to [[Evaluation|evaluate]] its positions <ref>[https://www.talkchess.com/forum3/viewtopic.php?f=2&t=78122&start=14 Re: Arasan 23.0] by [[Jon Dart]], [[CCC]], September 08, 2021</ref>. The neural network file is external to the program and is loaded at runtime.
===Traditional===
* [[Material]]
* [[Piece-Square Tables]]
** [[King Safety#PawnShield|Pawn Shelter]]
** [[King Safety#PawnStorm|Pawn Storm]]
===[[Automated Tuning]]===
Arasan '''19.2''', released in November 2016, applies [[Texel's Tuning Method]] by default and supports the [https://en.wikipedia.org/wiki/Stochastic_gradient_descent#Adam Adam] [https://en.wikipedia.org/wiki/Gradient_descent gradient descent] algorithm <ref>[http://www.talkchess.com/forum/viewtopic.php?t=61948 Arasan 19.2] by [[Jon Dart]], [[CCC]], November 03, 2016</ref> <ref>[https://scholar.google.nl/citations?user=yyIoQu4AAAAJ Diederik P. Kingma], [https://scholar.google.ca/citations?user=ymzxRhAAAAAJ&hl=en Jimmy Lei Ba] ('''2015'''). ''Adam: A Method for Stochastic Optimization''. [https://arxiv.org/abs/1412.6980v8 arXiv:1412.6980v8], [http://www.iclr.cc/doku.php?id=iclr2015:main ICLR 2015]</ref>.
==[[Syzygy Bases]]==
=Tournament Play=
Arasan went online in December, 1996 <ref>[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/4a4705301c3c3229 Arasan goes online] by [[Jon Dart]], [[Computer Chess Forums|rgcc]], January 6, 1997</ref> , and played almost all major online computer chess tournaments, such as [[CCT Tournaments]], [[ACCA Americas' Computer Chess Championship]], [[ACCA World Computer Rapid Chess Championship]], [[TCEC]], and [[Italian Computer Chess Championship#IGWT|International Gsei Web Tournaments]]. Arasan 15.1 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=46077 Arasan 15.1] by [[Jon Dart]], [[CCC]], November 19, 2012</ref> won the [[ACCA 2012]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=46047 Seventh Annual ACCA Americas' Computer Chess Championships] by [[Jon Dart]], [[CCC]], November 18, 2012</ref> , Arasan 16.0 the [[WCRCC 2013]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=48703 Arasan games from WCRCC] by [[Jon Dart]], [[CCC]], July 21, 2013</ref> . Over the board, Arasan is was active at the [[CSVN Programmers Tournament|CSVN Programmers Tournaments]] operated by [[Tessa Pijl]]. Arasan was runner-up behind [[The Baron]] in May 2014 at the [[PT 46]] one point behind, as well in June 2015 at the [[PT 48]] with the same score according to the tiebreak rules <ref>[http://www.talkchess.com/forum/viewtopic.php?t=56645&start=3 Baron 1st, Arasan 2nd] by [[Jon Dart]], [[CCC]], June 14, 2015</ref>.
=Photos & Games=
'''2021'''
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77414 Arasan 22.3] by [[Jon Dart]], [[CCC]], May 31, 2021
* [https://www.talkchess.com/forum3/viewtopic.php?f=2&t=78122 Arasan 23.0] by [[Jon Dart]], [[CCC]], September 06, 2021
: [https://www.talkchess.com/forum3/viewtopic.php?f=2&t=78122&start=14 Re: Arasan 23.0] by [[Jon Dart]], [[CCC]], September 08, 2021
'''2022'''
* [https://www.talkchess.com/forum3/viewtopic.php?f=2&t=79500 Arasan 23.3] by [[Jon Dart]], [[CCC]], March 12, 2022
=External Links=
'''[[Engines|Up one Level]]'''
[[Category:Open Source]]
[[Category:MIT]]
[[Category:Nobility]]
[[Category:UCI]]
[[Category:Mac]]
[[Category:Windows]]
[[Category:NNUE]]
[[Category:Chess Pieces]]
