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 1981 Women's World Chess Championship 1981 The 1981 Women's World Chess Championship was won by Maia Chiburdanidze, who successfully defended her title against challenger Nana Alexandria after a closely fought match, which ended in an 8-8 tie. Like the previous one, this championship cycle contained two Interzonal tournaments, held in Rio de Janeiro in September and Alicante in October 1979, featuring the best players from each FIDE zone. A total of 35 players took part, with the top three from Rio (17 players) and the top four from Alicante (18 players) qualifying for the Candidates Tournament. Ioseliani won convincingly in Rio,