The World Bridge Federation is responsible for world championship competitions, most of which are conducted at a few multi-event meets on a four-year cycle. The most prestigious championships are those for national teams in Open, Women, Seniors and Mixed categories: the Bermuda Bowl, Venice Cup, Senior Bowl and Wuhan Cup (jointly the biennial “World Teams Championships”), and the quadrennial World Team Olympiads, incorporated in the World Mind Sports Games beginning 2008.