Bobby Fischer games, the only perfect score in the history of the tournament. His book "My 60 Memorable Games", published in 1969, is regarded as a classic work of chess literature. He won the 1970 Interzonal Tournament by a record 3½-point margin, and won 20 consecutive games, including two unprecedented 6–0 sweeps, in the Candidates Matches. In July 1971, he became the first official FIDE number-one-rated player. Fischer won the World Chess Championship in 1972, defeating Boris Spassky of the USSR, in a match held in Reykjavík, Iceland. Publicized as a Cold War confrontation between the US and USSR, it attracted more
Bobby Fischer the match should be of unlimited duration, but the 9–9 clause was once again rejected, by a narrow margin of 35 votes to 32. FIDE set a deadline of April 1, 1975, for Fischer and Karpov to confirm their participation in the match. No reply was received from Fischer by April 3. Thus, by default, Karpov officially became World Champion. In his 1991 autobiography, Karpov professed regret that the match had not taken place, and claimed that the lost opportunity to challenge Fischer held back his own chess development. Karpov met with Fischer several times after 1975, in friendly but