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 1991 first place. Xie won the playoff in Belgrade and Beijing in February 1991 by 4½-2½, earning the right to challenge the reigning champion for the title. The championship match was played in Manila in 1991. In a result that came as a surprise to most of the chess world, the relatively unknown Chinese challenger Xie won 4 games (against 2) and the match, ending Chiburdanidze's 13-year reign as world champion. Women's World Chess Championship 1991 The 1991 Women's World Chess Championship was won by Xie Jun, who defeated the incumbent champion Maia Chiburdanidze in the title match. As part of