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 called a legend in his own time." Former World Champion Tigran Petrosian stated that Fischer put more time into chess than the entire Soviet team. Biographers David Edmonds and John Eidinow wrote: Faced with Fischer's extraordinary coolness, his opponents [sic] assurance would begin to disintegrate. A Fischer move, which at first glances looked weak, would be reassessed. It must have a deep master plan behind it, undetectable by mere mortals (more often than not they were right, it did). The US grandmaster Robert Byrne labeled the phenomenon "Fischer-fear". Grandmasters would wilt, their suits would crumple, sweat would glisten on their