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a portable [[:Category:Open Source Engines|open source engine]] supporting the [[Chess Engine Communication Protocol]] written by [[Robert Hyatt]] in [[C|ANSI C]] starting in the early 90s, loosely derived from [[Cray Blitz]], winner of the [[WCCC 1983|1983]] and [[WCCC 1986|1986]] World Computer Chess Championships <ref>[https://en.wikipedia.org/wiki/Crafty Crafty from Wikipedia]</ref>. Crafty pioneered in using [[Rotated Bitboards|Rotated bitboards]] , [[Parallel Search|parallel search]] and probing [[Nalimov Tablebases]]. It performs a [[Principal Variation Search|principal variation search]], [[Null Move Pruning|null move pruning]], [[Late Move Reductions|LMR]] as well as a [[SEE - The Swap Algorithm|SEE swap algorithm]] for [[Move Ordering|move ordering]] and to [[Pruning|prune]] "bad" [[Captures|captures]] in [[Quiescence Search|quiescence search]]. In 2006/2007, Crafty switched from rotated to [[Magic Bitboards|Magic bitboards]] <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=5452&start=56 Re: Fastest Magic Move Bitboard Generator ready to use] by [[Robert Hyatt]], [[Computer Chess Forums|Winboard Forum]], November 09, 2006</ref>, according to Robert Hyatt because it was not faster but simpler <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=140141&t=16002 Re: BitBoard Tests Magic v Non-Rotated 32 Bits v 64 Bits] by [[Robert Hyatt]], [[CCC]], August 25, 2007</ref>. Crafty '''25.1''', released in October 2016, not only includes an increase in playing strength <ref>[http://www.craftychess.com/ Crafty Chess] managed by [[Tracy Riegle]]</ref> but support for [[Syzygy Bases|Syzygy bases]] by [[Ronald de Man]] aided by the coding [[Syzygy Bases#Fathom|contributions]] of [[Basil Falcinelli]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=61594 Crafty 25.1 Release] by [[Michael Byrne|Michael B]], [[CCC]], October 04, 2016</ref>. Crafty '''25.3''' features [[Playing Strength|playing strength]] adjustment between 800 and 2600 Elo <ref> [http://www.talkchess.com/forum/viewtopic.php?t=62907 Crafty Play By Elo ( Crafty v25.3)] by [[Michael Byrne|Michael B]], [[CCC]], January 23, 2017</ref>.