World Chess Championship a Kasparov match, either with 2002 FIDE champion Ponomariov, or 2004 FIDE champion Kasimdzhanov. Partly due to his frustration at the situation, Kasparov retired from chess in 2005, still ranked No. 1 in the world. Soon after, FIDE dropped the short knockout format for a World Championship and announced the FIDE World Chess Championship 2005, a double round robin tournament to be held in San Luis, Argentina between eight of the leading players in the world. However Kramnik insisted that his title be decided in a match, and declined to participate. The tournament was convincingly won by the Bulgarian Veselin
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