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
World Chess Championship 1972 about with Boris demonstrating his careless mistakes. The two were left wondering how Bobby could have squeezed a win from a position which a night of competent analysis by a renowned Soviet team had showed to be a guaranteed draw. Former World Champion Mikhail Botvinnik said this game made a particularly strong impression on him. He called it "the highest creative achievement of Fischer". He resolved a opposite-colored bishops endgame by sacrificing his bishop and trapping his own rook. "Then five passed pawns struggled with the white rook. Nothing similar had been seen before in chess". David Bronstein said, "Of