World Chess Championship Topalov, and negotiations began for a Kramnik–Topalov match to unify the title. The FIDE World Chess Championship 2006 reunification match between Topalov and Kramnik was held in late 2006. After much controversy, it was won by Kramnik. Kramnik thus 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
Women's World Chess Championship 2012 Women's World Chess Championship 2012 The Women's World Chess Championship 2012 was a knockout tournament, to decide the women's world champion. The title was won by Anna Ushenina of Ukraine for the first time. Defending champion Hou Yifan went out in the second round. The tournament was played as a 64-player knockout type in Khanty Mansiysk, Russia, from 10 November to 1 December 2012. Each pairing consisted of two games, and tie-breaks at faster time controls, if necessary. After only two wins by lower rated players in the first round, the second round saw the top three seeds all going