The Candidates Tournament (or in some periods Candidates Matches) is a chess tournament organized by FIDE, chess's international governing body, since 1950, as the final contest to determine the challenger for the World Chess Championship.The winner of the Candidates earns the right to a match for the World Championship against the incumbent World Champion.

A round robin competition is where everyone plays everyone else. If everyone plays each other twice it is called a double round robin - as used in some the prestigious Eights matches (President's Cup, Spencer Ell, etc.) at the end of each croquet season in England. See the Wikipedia entry for round robin tournaments.. Key factors about a round robin are that: