Second round: 9 pairs of lottery and 1 single lottery, if one group is drawn, it will be eliminated, if a single lottery is drawn, it will directly advance to the next round, and the remaining 10 people will be drawn for the third round;
The third round: 5 pairs of tickets, one group of elimination system (one or two sets), and the remaining 5 people draw the fourth round;
The fourth round: 2 pairs of tickets and 1 single ticket, one group was eliminated, and the single ticket was directly advanced to the next round, and the remaining 3 people played the final;
Final: 3 people play against each other, or you can draw statistical results to let one person enter the final directly, and the winner of the remaining two people enter the final.