Mind Sports Olympiad
The Mind Sports Olympiad is an olympics for the mind with over 60 different board game competitions ranging from classics like Chess, Scrabble and Go to newer games.
The inaugural event was held in 1997 in London with £100,000 prize fund. The Mind Sports Olympiad continues to take place every year in England. The organising body has experienced some trouble over the years, you can find references to those in places such as wikipedia.