Filip twice qualified for the
Candidates Tournament, which is the tournament to choose a world championship challenger. In 1955 Filip placed seventh in the
Gothenburg Interzonal, qualifying for the Candidates, which was held in
Amsterdam the following year. He placed eighth out of ten players. (See
World Chess Championship 1957.) In 1962 Filip placed fifth (out of 23 players) in the
Stockholm Interzonal. This qualified him for the Candidates tournament in
Curaçao, where he tied for last place out of eight players. (See
World Chess Championship 1963.) ==Three-time Czechoslovak Chess Champion==