Douglas Griffin on X: Amsterdam IBM tournament, 19th July 1973. The 3rd-round meeting between two ex-World Champions from the USSR, Tigran Petrosian & Boris Spassky. The game was drawn in 21 moves. (

X 上的Douglas Griffin：「At the opening ceremony of the Amsterdam IBM tournament, 16th July 1973 - the city's burgemeester, Ivo Samkalden, flanked by ex-World Champions Tigran Petrosian and Boris Spassky. (Photo source

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Party Animal: the lost triumph of Tigran Petrosian

Douglas Griffin on X: Amsterdam IBM tournament, 19th July 1973. The 3rd-round meeting between two ex-World Champions from the USSR, Tigran Petrosian & Boris Spassky. The game was drawn in 21 moves. (

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