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
Women's World Chess Championship who defeated Natalia Pogonina in the final. Hou defeated Muzychuk 6-3 to reclaim the Women's World Chess Championship 2016 title for her 4th championship in March 2016. The following year Tan Zhongyi defeated Anna Muzychuk for the title at the Women's World Chess Championship 2017. Tan lost the title defending it against Ju Wenjun (with Hou not participating at this event) at the Women's World Chess Championship Match 2018. After the 2018 championship the new FIDE president Arkady Dvorkovich announced the format would be changed back to matches only. He said the many different champions the yearly system created discredited