Gata Kamsky

Gata Kamsky (Tatar: Гата Камский; Russian: Гата Камский; born June 2, 1974) is a Soviet-born American chess grandmaster, and a five-time U.S. champion.
Kamsky reached the final of the FIDE World Chess Championship 1996 at the age of 22, and reached a ranking of fourth in the world rankings in 1995. He played almost no FIDE-rated games between 1997 and late 2004.
Kamsky won the Chess World Cup 2007. This earned him a Candidates Match against Veselin Topalov, which he lost. Kamsky also competed in the Candidates Tournament in 2011, losing to Boris Gelfand.