Chess right of a deposed champion to a rematch, and the next champion, Armenian Tigran Petrosian, a player renowned for his defensive and positional skills, held the title for two cycles, 1963–1969. His successor, Boris Spassky from Russia (champion 1969–1972), won games in both positional and sharp tactical style. The next championship, the so-called Match of the Century, saw the first non-Soviet challenger since World War II, American Bobby Fischer, who defeated his Candidates opponents by unheard-of margins and clearly won the world championship match. In 1975, however, Fischer refused to defend his title against Soviet Anatoly Karpov when FIDE did
Bobby Fischer allowing him to live in Iceland until his death in 2008. Fischer made numerous lasting contributions to chess. In the 1990s, he patented a modified chess timing system that added a time increment after each move, now a standard practice in top tournament and match play. He also invented Fischerandom, a new variant of chess known today as "Chess960". Bobby Fischer was born at Michael Reese Hospital in Chicago, Illinois, on March 9, 1943. His birth certificate listed his father as Hans-Gerhardt Fischer, also known as Gerardo Liebscher, a German biophysicist. His mother, Regina Wender Fischer, was a US citizen,