Netherlands x URSS (Match) 25' Lodewijk Prins vs Viktor Korchnoi (L) Watching the game standing we see Tigran Petros…

Karpov - Korchnoi World Championship Match (1981) chess event

Clube de Xadrez Scacorum Ludus: O antigo ofício de arbitrar xadrez

Viktor Korchnoi Quote: “The aim was simple: to deprive Karpov of his favourite occupation – standing at the board, staring straight at his oppon”

Books about Korchnoi and Karpov by Edward Winter

Anatoly Karpov vs Viktor Korchnoi Dortmund Sparkassen (1994) #chess

X 0089 Selo Xadrez São Tomé e Principe Karpov Korchnoi 1981

Karpov X Korchnoi Merano 81 Herbert Carvalho

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Karpov against the Isolated Queen's Pawn - TheChessWorld

Match / Karpov-korchnoi (campeonato Mundial de Ajedrez 1978)