1978-KARPOV-VS.-KORTCHNOI - Play Chess with Friends

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1985-KASPAROV-VS.-KARPOV - Play Chess with Friends

The dirtiest chess match in history': Stean on Karpov-Korchnoi, 1978

Viktor Korchnoi dies at 85

Viktor Korchnoi, Chess Giant Who Drew Soviet Ire, Dies at 85 - The New York Times

Cheating in Chess – The Record

Karpov vs. Korchnoi World Chess Championship 1978

Karpov's annotations to his six wins from Merano, 1981.

Karpov on Karpov: Memoirs of a Chess World Champion by Anatoly Karpov

The World Chess Championship: Korchnoi vs. Karpov: Raymond Keene: 9780671246488: : Books

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

1985-KASPAROV-VS.-KARPOV - Play Chess with Friends

The dirtiest chess match in history': Stean on Karpov-Korchnoi, 1978