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Viktor Korchnoi was born on March 23, 1931, in Leningrad, Russia. He was a chess grandmaster and one of the world's top players in the 1970s and 1980s. He was also a political dissident who fled the Soviet Union in 1976 and settled in Switzerland. Korchnoi was a very aggressive player and was known for his tactical skill and his ability to win games from difficult positions.