Maximum 32 players at the start. Head 2 head using the Swiss system. After eight rounds the best eight plays the final series. How this is played depends on the time left but will be two four player groups (ranks 1, 4, 5, 8 so far and ranks 2, 3, 6, 7). One game, losers finish. Two three player groups, one game, losers finish. Finally with the left four players. Depending on the time available it will be one, two or the maximum of three games played.