We are also 20 people and 4 venues, divided into 10 groups, with 2 people in each group and 2 wins in 3 games.
Then, after the 10 group match, there are still 10 people left, and 10 people will draw lots again and be eliminated in five groups. .
Draw lots after five groups, of which 1 person has a bye, and the other four people are eliminated in two groups. .
In the end, four people eliminated two people, and the remaining two competed for the third place with the 1 who had just worshipped. .
Then there is the round robin, in which three players, A, B, C, A and B, play. If A wins, A plays against C again, and A wins again, then he is the champion.
In the end, B and C are left to play. Whoever wins is the runner-up, and the other is the third runner-up.