World Team Olympiad in the WMSG but the constituent events of the Olympiad continue—Teams championships in Open and Women categories as part of the WMSG; in Seniors and Transnational categories as non-medal side events. World Team Olympiad The World Team Olympiad was a contract bridge meet organized by the World Bridge Federation every four years from 1960 to 2004. Its main events were world championships for national teams, always including one open and one restricted to women ("Open" and "Women" "categories" in WBF terms). A parallel event for seniors was inaugurated in 2000. Although the Olympiad has been discontinued, its main constituent championships
Return period interest and formula_5 is the counting rate. If the return period of occurrence is 1 in 234 years (formula_5 = 0.0043) then the probability of no occurrence in ten years is In a given period of "n" years, the probability of a given number "r" of events of a return period formula_5 is given by the binomial distribution as follows. In the limit of :formula_11, such that formula_12 then Take where Given that the return period of an event is 100 years, So the probability that such an event occurs "exactly once" in 10 successive years is: Return period is