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 Regina feared he was spending too much time alone". As a result, on November 14, 1950, Regina sent a postcard to the "Brooklyn Eagle" newspaper, seeking to place an ad inquiring whether other children of Bobby's age might be interested in playing chess with him. The paper rejected her ad, because no one could figure out how to classify it, but forwarded her inquiry to Hermann Helms, the "Dean of American Chess", who told her that Master Max Pavey, former Scottish champion, would be giving a simultaneous exhibition on January 17, 1951. Fischer played in the exhibition. Although he held