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At the World Chess Championship 1963 Tigran Petrosian narrowly qualified to challenge Mikhail...

At the World Chess Championship 1963 Tigran Petrosian narrowly qualified to challenge Mikhail Botvinnik for the World Chess Championship, and then won the match to become the ninth World Chess Champion. The cycle is particularly remembered for the controversy surrounding the Candidates' Tournament at Curaçao in 1962, which resulted in FIDE changing the format of the Candidates Tournament to a series of knockout matches. The world championship cycle was under the jurisdiction of FIDE, the World Chess Federation, which set the structure for the fifth world championship series at the 1959 FIDE Congress in Luxemburg. The cycle began with the zonal tournaments of 1960. The top finishers in the zonals met at the Interzonal, with the top six players from the Interzonal qualifying for the Candidates' Tournament. They were then joined by Mikhail Tal (loser of the last World Championship match in 1961) and Paul Keres (runner-up at the 1959 Candidates) in the eight player Candidates Tournament in 1962. The winner of the Candidates would qualify to play a World Championship match against Mikhail Botvinnik, the incumbent champion, in 1963. FIDE now had more than fifty member Federations that