Changes

===[[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]]==

* [[Material]]

* [[Piece-Square Tables]]

** [[King Safety#PawnShield|Pawn Shelter]]

** [[King Safety#PawnStorm|Pawn Storm]]

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]]==

'''2021'''

* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77414 Arasan 22.3] by [[Jon Dart]], [[CCC]], May 31, 2021

=External Links=

[[Category:Mac]]

[[Category:Windows]]

[[Category:Chess Pieces]]