How fair is tug-of-war and 22 class competitions? ! ! ! Thank you. thank you

The lottery is divided into 1 1 groups for elimination. The first round of elimination 1 1 class, and the rest 1 1 class draw lots, in which one class draws a promotion mark to directly advance, and the other1class eliminates five classes, and six classes directly advance to * * *, and then are divided into three groups to eliminate, thus leaving the last three.