Bobby Fischer, the troubled chess genius who achieved fame by taking the game's world championship from the Soviet Union during the Cold War, has died, his spokesman said Friday. He was 64. U.S.-born Fischer, a fierce critic of his homeland who renounced his US citizenship, moved to Iceland in 2005. The Chicago-born, Brooklyn, N.Y.-reared Fischer was wanted in the United States for playing a 1992 rematch against Cold War rival Boris Spassky in Yugoslavia in defiance of international sanctions. An American chess champion at 14 and a grand master at 15, Fischer became an icon when he dethroned the Soviet Union's Spassky in 1972 in a series of games in Iceland's capital, Reykjavik, to claim America's first world chess championship in more than a century.