Topalov became the FIDE champion in 2005. He lost his title in a classical match against Vladimir Kramnik, the purpose of which was to unify the titles. During the match, his manager accused his opponent of cheating. The match ended the division between world titles, which had arisen in 1993. Next, Topalov defeated Gata Kamsky in February 2009 in Sofia, Bulgaria to earn the right to be the challenger for the World Chess Championship in 2010. Topalov lost the World Championship match with Anand 5½–6½ in May 2010.