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 2010 tournament eventually won by Indian GM Viswanathan Anand to become the World Champion. Anand subsequently defended his title in a one-off match against Kramnik, the World Chess Championship 2008. The World Chess Championship format then returned to its original form, wherein a match between the current champion and a challenger would decide the World Champion. To choose the challenger, FIDE organized the Chess World Cup 2007. Topalov was compensated for missing the 2007 tournament by getting direct entry to a Challenger Match against the winner of the Chess World Cup. The winner of the Challenger Match would then be the