12 teams were divided into 4 groups, with 3 teams in each group. First, each team plays a single round robin, that is, 12 games. The team with the first place in each group, that is, the team with two consecutive victories, advances to the semi-finals, and then draws lots to decide the semi-final match. The winner competed for the championship, with 3 games.
The advantage of this competition system is that there is no bye, and each team can participate in at least two games (only 1 game in the single elimination system), and the total number of games is not much, 15 games (single elimination system1/game). If there is a series of 1 win 1 loss between three teams in the group stage, the referee group can calculate the scores according to their performance or vote to decide who will qualify.