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 as a very important and useful ideological tool to demonstrate the intellectual superiority of the Soviet communist regime over the decadent West. That’s why the Spassky defeat [...] was treated by people on both sides of the Atlantic as a crushing moment in the midst of the Cold War. The match was played during the Cold War, although during a period of increasing détente. The Soviet Chess School had long held a monopoly on the game at the highest level. Spassky was the latest in an uninterrupted chain of Soviet world chess champions, stretching back to the 1948 championship. Fischer,