World Chess Championship Topalov, and negotiations began for a Kramnik–Topalov match to unify the title. The FIDE World Chess Championship 2006 reunification match between Topalov and Kramnik was held in late 2006. After much controversy, it was won by Kramnik. Kramnik thus became the first unified and undisputed World Chess Champion since Kasparov split from FIDE to form the PCA in 1993. Kramnik played to defend his title at the World Chess Championship 2007 in Mexico. This was an 8-player double round robin tournament, the same format as was used for the FIDE World Chess Championship 2005. This tournament was won by Viswanathan
World Chess Championship 1969 Candidates Matches to challenge Petrosian for the World Championship, which he did successfully. (Spassky had unsuccessfully challenged Petrosian in 1966.) Larsen and Tal contested a third place playoff in the Dutch town of Eersel in March 1969, which Larsen won 5½–2½. The match was played as best of 24 games. If it ended 12-12, Petrosian, the title holder, would retain the Championship. Spassky won. World Chess Championship 1969 The 1969 World Chess Championship was played between Tigran Petrosian and Boris Spassky in Moscow from April 14 to June 17, 1969. Spassky won. The 1967 Interzonal Tournament was played in Sousse,