Petrosian - Spassky World Championship Match (1969) chess event

Tal, Petrosian, Spassky and Korchnoi — A Chess Multibiography with 207 Games – Tri Bridges

Pal Benko, Who Stepped Aside for Bobby Fischer, Dies at 91 - The New York Times

Playing Tigran Petrosian

Anatoly Karpov at the 41st USSR Championship (Moscow, 1973).

Petrosian - Spassky World Championship Match 1969 - Chessentials

1972 Fischer/Spassky: The Match, Its Origin, and Influence by World Chess Hall of Fame - Issuu

Spassky: “I knew the openings badly”

Petrosian - Spassky World Championship Match (1969) chess event

Willy Simons, Author at Nairobi Chess Club

RONEN-THROUGH-CHESS-HISTORY-SPASSKY-VS.-PETROSIAN-1969-WORLD-CHAMPIONSHIP - Play Chess with Friends

Bobby Fischer, Troubled Genius of Chess, Dies at 64 - The New York Times

Boris Spassky vs Tigran Petrosian (1969)

BORIS SPASSKY VS TIGRAN PETROSIAN WORLD CHAMPIONSHIP MATCH 1966..TORRE ATTACK:CLASSICAL DEFENCE, DAILY CHESS:A very interesting,baffling and ultimately instructive game.., By Chess Hustlers

World Chess Championship 1969 - Wikipedia