Play Like A World Champion: Petrosian and Spassky - Chess Lessons

In 1963 Tigran Petrosian unseated Botvinnik as World Champion for the final time. Petrosian was a defensive genius and held his title again in 1966 against Boris Spassky. In 1969 Spassky won another candidates cycle and defeated Petrosian to take the title.

World Chess Championship - Wikipedia

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