Clash of Champions: Spassky vs. Petrosian

For the first time since Alekhine, there was a world champion not named "Botvinnik" who was also not merely renting the title for a year. The Armenian named Tigran Petrosian held the title of world champion, with his unusual, "left-handed" style of quiet positional play and sharp tactics. Petrosian's

Petrosian vs the Elite - Schachversand Niggemann

Petrosian - Spassky World Championship Match (1969) chess event

Chess faces stalemate in its match with machines

50 years ago, the USSR was battling the Rest of the World

The 12 Greatest Chess Players of All Time - Chessable Blog

Clash of Champions: Spassky vs. Petrosian

Karpov prepares for Fischer

When Boris Spassky was captured by the Fischer king - The New European

The Petrosian-Spassky World Championship Match (Moscow, 1966), with annotations by Tal, Boleslavsky, Bondarevsky, etc.

Clash of Champions: Spassky vs. Petrosian

Botvinnik versus Smyslov and Petrosian

Welcome to Elk and Ruby Publishing House

Botvinnik - Tal World Championship Match (1960) chess event