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 of Larsen, Efim Geller, and Robert Hübner, with 15/23. Fischer finished the tournament with seven consecutive wins. Setting aside the Sousse Interzonal (which Fischer withdrew from while leading), Fischer's victory gave him a string of eight consecutive first prizes in tournaments. Former World Champion Mikhail Botvinnik was not, however, impressed by Fischer's results, stating: "Fischer has been declared a genius. I do not agree with this... In order to rightly be declared a genius in chess, you have to defeat equal opponents by a big margin. As yet he has not done this". Despite Botvinnik's remarks, "Fischer began a miraculous