A few simple rules ... limitless possibilities

This is main open event at the Mind Sports Olympiad (MSO) in London each August. Normally at JW3, London, NW3 6ET; 10:00 to 18:15 Entry fee £15 (Juniors £13).

For 2020 will be free entry, played on afternoon/evening of Sunday 23rd August. Online on OGS in group Mind Sports Olympiad. 4-round McMahon. 30 mins + 10 secs Fischer time (max acrued 30 mins). Play-off if tie for first on 4 wins. First prize £50.