Five classes held a debate competition. How can we arrange a fair decision to win the third place? It's best not to exceed six games. Thank you.

In the first round, five teams drew lots, with 1 and 2 as a group, 3 and 4 as a group, and 5 bye (that is, two teams were drawn and bye was promoted to the first team), and three teams were decided to advance. The three teams that advanced in the second round, 1v2, 2v3, 3v 1, (judging whether a couple has won two championships in a row depends on the points, so you have to score) This competition system is two rounds and five games.

Second, do you have a college debate team? (If not, you can invite teams from other colleges. (This is six teams. We assume that the invited team is called an expert team. If this team does not advance, the team competing with this team will not win or lose, only score. Then the two winning teams advance, and the remaining three teams advance according to the points. The key is the team you invited. If it is too strong, you need to ask them to mainly guide the opposite side to express their ideas. Secondly, the judges, if scoring, the judges have different opinions. This operation is not easy. (The method remains unchanged after 6 into 3)