Mind Sports Olympiad up to International Grandmaster. The Mind Sports Olympiad main event was at large venues for the first four years before being reduced in size due to funding difficulties. It has been held annually since 1997 at the following locations in England: The MSO consists mainly of single event competitions most of which are for the nominal title of Olympiad champion, though some trademarked games are authorised by the game designer and publishers as the official world championships. All games, whether an Olympiad or the official World championship, can count towards the Pentamind. Medals, and more recently trophies, are awarded for
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