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
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