Anatoly Karpov vs Viktor Korchnoi World Championship Match (1981)

Viktor Korchnoi - Wikipedia

Karpov - Korchnoi World Championship Match (1978) chess event

Winning Moves of Anatoly Karpov

Viktor Korchnoi plays chess against Karpov. News Photo - Getty Images

The World Chess Championship: Korchnoi vs. Karpov

Viktor Korchnoi, chess player and cold war defector, 1931-2016

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Karpov against the Isolated Queen's Pawn - TheChessWorld

Mind control, levitation and no pain: the race to find a superman in sport, Books

Karpov at 70: “My great blunder was I agreed to hold the match with Kasparov in the Soviet Union”