There are volleyball matches in 9 classes in Grade 6. If there is a knockout, how many games will it take to finally decide the champion?

It takes 8 games, and each round draws lots to get a class that is directly promoted, and other groups will be eliminated.

1, 9 classes draw lots, leaving 8 classes and 4 games, leaving 5 classes after elimination.

2. Five classes draw lots, leaving four classes with two games. After elimination, there are three levels left.

3. Three classes draw lots, leaving two classes 1 game, and eliminating the last two classes.

4, class 2 finals 1 decide the champion.