The final unofficial tournament (which does not appear on records in Wisden Cricketers' Almanack or Cricinfo) was held in 1964, with Barbados, British Guiana, Jamaica and Trinidad competing in a league, which British Guiana won.
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Since the 2010–11 season the teams have played each other once in a round-robin format followed by semi-finals which are contested between the top four teams of the league stage.
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