Tigran Vartanovich Petrosian vs Viktor Korchnoi
Korchnoi - Petrosian Candidates Quarterfinal Velden AUT round 8 1980.03.23
Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation 1/2-1/2
https://www.chessgames.com/perl/chessgame?gid=1082603
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