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 2016 at a 6–6 tie, so tie breaks decided the match. After two draws to begin the rapid chess tie break, Carlsen won the remaining two games to win the match and retain his title. The Candidates Tournament to determine the challenger was held on 11–30 March 2016 in Moscow, Russia, with FIDE's commercial partner Agon as the official organizer, with support from the Russian Chess Federation. The tournament was an 8-player double round-robin, with five different qualification paths possible: the loser of the World Chess Championship 2014 match, the top two finishers in the Chess World Cup 2015, the top