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Tigran Vartanovich Petrosian (June 17, 1929 – August 13, 1984) was a former world chess champion.

In 1963 he defeated Mikhail Botvinnik 12.5–9.5 to become world chess champion. His patient, defensive style frustrated Botvinnik, who only needed to make one risky move for Petrosian to punish him. Petrosian is the only player to go through the Interzonal and the Candidates process undefeated on the way to the world championship match.

Petrosian defended his title in 1966, defeating Boris Spassky 12.5–11.5, the first World Champion to win a title match while champion since Alekhine beat Bogoljubov in 1934. In 1968, he was granted an M.Phil. from Yerevan University for his thesis, "Chess Logic". In 1969 Spassky got his revenge, winning by 12.5–10.5 and taking the title.

He was the only player to win a game against Bobby Fischer during the latter's 1971 Candidates matches, finally bringing an end to Fischer's amazing streak of twenty consecutive wins (seven to finish the 1970 Palma de Mallorca Interzonal, six against Taimanov, six against Larsen, and the first game in their match).

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Tsenkov, Ljubomir     (BGR)        [member # 57] Correspondence chess : 2521       Ranked  #  13   in the rating list. Rating history :  No change this year. Big chess :   1686       This member may have a profile in the social network.