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
American Chess Congress not interested in playing a championship match, but Isidor Gunsberg, the third-place finisher, exercised his right and challenged Chigorin to a World Championship match. In 1890, he drew a first-to-10-wins match against Chigorin (9-9 with five draws). These were the same terms (9-9 draw clause) as the first World Championship match between Steinitz and Zukertort in 1886. Incidentally, they were also the same match terms that Bobby Fischer would insist on for his title defense in 1975. The seventh American Chess Congress was held in St. Louis in 1904. With US Champion Harry Nelson Pillsbury ill and dying, Max Judd