everyone starts at 0 points, then you get placed against someone, play them and if you win, you get a point, if you lose, you get no points
then after everyone has 1 match, then you face off against someone with the same amount of points as you, or as close as possible to that
these rounds keep going so everyone has the same amount of matches against people with generally the same point range
then im guessing there will be a like top 8 or top 4 cut off for a double elim at the end
either way, wiki it