Kasparov, Gary
In 1993 Kasparov broke with FIDE and formed the rival Professional Chess Association, becoming its champion. In 1996 he became the first world champion to lose to a computer in a game played with time controls, but he won the match. In 1997, however, the computer, IBM's Deep Blue, defeated him in a rematch (see also artificial intelligence). In 2000, Kasparov lost a match and his widely recognized status as the world's best chess master to his onetime protégé, the 25-year-old Russian Vladimir Kramnik, but he subsequently was again regarded as the world's top player. A 2003 match with the chess program Deep Junior ended in a tie. One of the game's greatest players, Kasparov retired from professional chess in 2005 and has since devoted himself to political activities related to promoting democracy in Russia. He became a candidate for the Russian presidency in 2007 but was barred from running because he had not been nominated by a registered political party.
See his autobiography, World of Change (1987).