In what year did Petrosian lose the World Championship to Boris Spassky?
1969
1972
1966
1975
Answer
In 1969, Petrosian lost the World Championship to Boris Spassky. The match was held in Moscow, and Spassky won by a score of 12½–8½. This was Petrosian's first loss in a world championship match, and it marked the end of his reign as world champion.
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