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

Botvinnik - Tal World Championship Return Match 1961 - Chessentials

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World Chess Championship 1972 - Wikipedia

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Botvinnik - Petrosian: 1963 World Chess Championship Match - Kindle edition by Botvinnik, Mikhail . Humor & Entertainment Kindle eBooks @ .

Botvinnik versus Smyslov and Petrosian: Four World Chess Championship Matches - 1954, 1957, 1958 and 1963: Botvinnik, Mikhail, Soltis, Andy: 9789083347943: : Books

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50 Years Later: Why Fischer Vs. Spassky Was The Greatest World Championship Match

A remarkable photo, Fischer had just played 1.e4 and awaits Petrosian's move. A broken Petrosian seems to be unsure what opening he prefers to lose in…he chose …

Why do world champion chess matches (as depicted in The Queen's Gambit show on Netflix) have clocks? Can you lose the world championship on time? - Quora