9 teams, 2 teams, a debate, about 9 games (each team is required to have the same opportunity to play), seeking solutions, etc. …

(1) Draw lots to divide every two teams into four groups. The winning team enters the next round, and the first team goes to the next round by bye. (4 games)

② The remaining five teams are divided into two groups. The winning team enters the next round, and the bye team directly enters the next round; (2 games)

(3) The remaining three teams adopt the single round robin system, that is, each team plays a game with the other two teams; (3 games)

***4+2+3=9 games.