Women's Chess Olympiad Women's Chess Olympiad The Women's Chess Olympiad is an event held by FIDE (the International Chess Federation) since 1957 (every two years since 1972), where national women's teams compete at chess for gold, silver and bronze medals. Since 1976 the Women's Chess Olympiad has been incorporated within Chess Olympiad events, with simultaneous women's and open tournaments. The Soviet Union has won it the most often: 11 times. Since the break-up of the Soviet Union, China and Georgia have won the event four times each. It has also been won by Hungary, Ukraine and Israel (one year when it was boycotted
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