Scheme 1: draw lots and divide into AB groups, one of which will advance directly to the next round.
On the first day, five games were eliminated, five teams from 10 were promoted, and 1 team was selected for promotion;
The next day, six games were divided into AB group by lottery. Six teams in AB group implemented the points system, and the last team in AB group was eliminated and four teams advanced.
On the third day, the three games were divided into group AB by lottery. The winning team advanced, and the losing team in group AB played another game, and the winning team advanced.