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

The Petrosian-Spassky World Championship Match (Moscow, 1969), with annotations by Tal, Korchnoi, Boleslavsky & Bondarevsky.

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Boris Spassky vs Tigran Petrosian • World Championship, 1966

Tigran V Petrosian vs Boris Spassky (1966) Fit to be Tied

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Petrosian vs. Spassky World Championship 1966 - GM Ben Finegold

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Botvinnik - Tal World Championship Return Match 1961 - Chessentials