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 Blitz Chess Championship four World Champions, the field was considered the strongest of any blitz tournament in modern history. Heading into the event, two-time World Champion Tigran Petrosian was considered the favorite to win the event, with Mikhail Tal and Viktor Korchnoi also enjoying favorable chances. However, it was American grandmaster Bobby Fischer who put up a dominant performance, scoring 19/22 to win the tournament by 4½ points. Fischer scored a staggering 8½/10 against the five Soviet grandmasters in attendance, dropping only one game in the entire tournament and frequently gaining huge time advantages in each game. According to one report, Fischer spent