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
Development of the World Chess Championship not claim the title himself. Subsequent world championship matches returned to the format of a match between the champion and a challenger. The World Chess Championship 2008 was a 12-game match between the current champion Viswanathan Anand and 2006 champion Vladimir Kramnik. Anand convincingly defended his title in 11 games with 6½–4½. The World Chess Championship 2010 took place in April and May 2010, where Anand defeated 2005 FIDE champion Veselin Topalov (who defeated Chess World Cup 2007 winner Gata Kamsky in a match in February 2009 to determine Anand's challenger) to defend the title for the second time. FIDE