There were only three WMSG medal events at contract bridge in the 2012 Games, down from nine for the 2008 World Mind Sports Games. One other World Bridge Federation (WBF) event with world championship status was contested on site, the World Mixed Teams Championship for transnational mixed teams, which field male–female pairs only. The main events were parallel tournaments for open, women, and seniors national teams, 4 to 6 players, some with a non-playing captain and/or a coach (that is, the events of the quadrennial World Team Olympiad, 1960 to 2004, retrospectively termed the 1st to 12th World Bridge Games). They were conducted over the full 14 days of competition; the mixed teams over the latter 7 days, alongside the quarterfinal, semifinal, and final matches of the main events.