Reigning World Champion
Upon becoming World Champion, Petrosian campaigned for the publication of a chess newspaper for the entire Soviet Union rather than just Moscow. This newspaper became known as 64. Petrosian studied for a degree of Master of Philosophical Science at Yerevan State University; his thesis, dated 1968, was titled "Chess Logic, Some Problems of the Logic of Chess Thought".
Three years after Petrosian had earned the title of World Chess Champion, he was challenged by Boris Spassky. Petrosian successfully defended his title beating Spassky, a feat that had not been accomplished since Alexander Alekhine defeated Efim Bogoljubov in the 1934 World Chess Championship. However, Spassky would defeat Efim Geller, Bent Larsen and Viktor Korchnoi in the next candidates cycle earning a rematch with Petrosian, at Moscow 1969. Spassky won the match by 12½–10½.
Read more about this topic: Tigran Petrosian
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