have been organized by the World Chess Federation (FIDE)
to determine the challenger for the world Chess
championship. The cycle starts when the world's best Chess
players face off in one or more interzonal tournaments.
Players finishing with the highest scores in these interzonal tournaments qualified into a series of elimination matches known as the candidates tournament.
The number of qualified top players from this candidates
tournament varies from eight to fifteen players. The winner earns the right to a match for the
world championship against the incumbent world champion.
Current world champion is Magnus Carlsen.