Development of the World Chess Championship 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 Anand. Because Anand's World Chess Champion title was won in a tournament rather than a match, a minority of commentators questioned the validity of his title. Kramnik also made ambiguous comments about the value of Anand's title, but did
World Chess Championship 2008 (Vladimir Kramnik) had been given the right to challenge to regain his title. Its origin was in the complications in reunifying the world title in 2006. The chess world title was split between 1993 and 2006. In early 2006, FIDE had already announced the conditions for the World Chess Championship 2007: an eight-player tournament which included FIDE World Champion Veselin Topalov, but not "Classical" World Champion Vladimir Kramnik. FIDE later organized a reunification match between Kramnik and Topalov (the World Chess Championship 2006), with Kramnik to take Topalov's place in the 2007 tournament if he was to win the match.