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a commercial chess engine by [[Ubaldo Andrea Farina]], supporting both the [[Chess Engine Communication Protocol]] and [[UCI]], the [[PolyGlot]] and [[CTG]] <ref>[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=2319 CTG specification] by [[Steinar H. Gunderson|Sesse]], [[Computer Chess Forums|Rybka Forum]], September 30, 2007</ref> [[Opening Book#Formats|opening book formats]], various [[Endgame Tablebases|endgame tablebase]] and [[Endgame Bitbases|bitbase]] formats, and able to play [[Chess960]]. The development started in 2002 and it has been under continuous development, underwent a major rewrite in 2009 using [[Bitboards|bitboards]], and has been commercially released in October 2011 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=40529 Chiron 1.0 available for preorder] by [[Ubaldo Andrea Farina]], [[CCC]], September 26, 2011</ref> . Chiron applies [[Parallel Search|parallel search]] on [https://en.wikipedia.org/wiki/Multiprocessor multiprocessor] systems, and has implemented [[Blockage Detection|pawn blockage detection]] function <ref>[[Eli David|Omid David]], [[Ariel Felner]], [[Nathan S. Netanyahu]] ('''2004'''). ''Blockage Detection in Pawn Endgames''. [[ICGA Journal#27_3|ICGA Journal, Vol. 27, No. 3]]</ref> <ref>[[Eli David|Omid David]], [[Ariel Felner]], [[Nathan S. Netanyahu]] ('''2004'''). ''[http://link.springer.com/chapter/10.1007/11674399_13 Blockage Detection in Pawn Endings]''. [[CG 2004]]</ref>, improved to detect blockages not only in [[Pawn Endgame|pawn endgame]] but also when there are a few pieces on the board <ref>[http://www.chironchess.com/index.php/component/content/article/69 .:: Chiron Chess Engine ::.: | Pawn Blockages]</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?t=40748 Code of Chiron for Detection of Pawn Blockages] by [[Ubaldo Andrea Farina]], [[CCC]], October 13, 2011</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?t=41569 Chiron 1.1 bug?] by [[Richard Vida]], [[CCC]], December 24, 2011</ref>. Chiron is available as [[Windows]] and [[Android]] version.