Viktor Korchnoi (born in 1931 in Leningrad) is one of the great players in chess history. He first qualified for a Candidates Tournament for the World Championship as early as 1962, and subsequently took part many times in further Candidates Matches. His final candidates match was against Kasparov in 1983. For decades Korchnoi belonged to the absolute world elite. In the late 1970s he was number two in the world rankings behind Anatoly Karpov.
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