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 and 15 draws. Kasparov stated, "Bobby is playing OK, nothing more. Maybe his strength is 2600 or 2650. It wouldn't be close between us". Yasser Seirawan believed that the match proved that Fischer's playing strength was "somewhere in the top ten in the world". Fischer and Spassky gave ten press conferences during the match. Seirawan attended the match and met with Fischer on several occasions; the two analyzed some match games and had personal discourse. Seirawan later wrote: "After September 23 [1992], I threw most of what I'd ever read about Bobby out of my head. Sheer garbage. Bobby is