Frequency records how often a competition is actually held. Wikipedia notes the FIFA World Cup "has been held every four years since the inaugural tournament in 1930, with the exception of 1942 and 1946" during and after World War II. This dimension groups competitions that run on the same schedule.
Frequency
Sources
Australian Open, Official History
Tennis AustraliaContains: Australian Open
Roland Garros (French Open), Official History
Federation Francaise de TennisContains: French Open
US Open, Official History (Tennis)
United States Tennis AssociationContains: US Open (Tennis)
World Xiangqi Federation, Official Site
World Xiangqi FederationContains: World Xiangqi ChampionshipView the Source FMJD, Official Site
Federation Mondiale du Jeu de DamesContains: World Draughts ChampionshipView the Source World Othello Federation, Official Site
World Othello FederationContains: World Othello ChampionshipView the Source Wikipedia, Bermuda Bowl
Wikipedia, Olympic Council of Asia
CAF, Official History
Confederation of African FootballContains: Africa Cup of NationsView the Source Wikipedia, Ryder Cup
Wikipedia, The Ashes
Wikipedia, Copa America
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