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Defending champion |
Challenger | |||||
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 Tigran Petrosian |
Boris Spassky | |||||
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Born 17 June 1929 36 years old |
Born 30 January 1937 29 years old | |||||
| Winner of the 1963 World Chess Championship | Winner of the 1965 Candidates Tournament | |||||
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A World Chess Championship was played between Tigran Petrosian and Boris Spassky in Moscow from April 9 to June 9, 1966. Petrosian won.