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a commercial chess program developed by [[Chris Whittington]] in the mid 90s as successor of the [[Complete Chess System]], marketed through his company [[Oxford Softworks]]. The first version was a [[MS-DOS]] program, '''Chess System Tal II''', released in 1999 ran under [[Windows]]. Chess System Tal is famous for its entertaining, strong human playing style with focus on [[King Safety|King attacks]] and speculative [[Sacrifice|sacrifices]], resembling that of the former World Champion [https://en.wikipedia.org/wiki/Mikhail_Tal Mikhail Tal]. Chess System Tal II was further marketed by [[Ubisoft]] <ref>[http://www.spieletipps.de/pc/chess-system-tal-2/ Chess System Tal 2 (PC) bei spieletipps] (German)</ref> and continued by [[Jeff Rollason|Jeff Rollason's]] [[AI Factory]] <ref>[http://www.aifactory.co.uk/AIF_Games_Chess_Tal.htm AI Factory Chess Tal]</ref> <ref>[http://www.aifactory.co.uk/AIF_Competitions.htm#chess AI Factory World Championships and Competitions - Chess]</ref>, who now own the rights on the CSTal sources <ref>[https://www.stmintz.com/ccc/index.php?id=429044 Re: For those interested in: A) Chess Tal B) New engines] by [[Thorsten Czub]], [[Computer Chess Forums|CCC]], May 30, 2005</ref>.