kəspärˈôf, –ŏf, 1963–, Armenian chess player, b. Azerbaijan (then in the USSR) as Garri Kimovich Wainshtein. He became the world junior champion at the age of 16 and was International Chess Federation (FIDE) champion from 1985 to 1993. His first title match (Sept., 1984–Feb., 1985) against Anatoly Karpov was the longest in chess history. After 48 games, the psychological and physical strain on Karpov, who was leading but appeared likely to lose, caused chess authorities to end the match inconclusively amid controversy. Kasparov won a rematch six months later, becoming the youngest world champion ever. He defended his title against Karpov in 1986, 1987, and 1990. 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 subsequently 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.

See his autobiography, World of Change (1987).

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