Analysis: This question examines the number of rounds and competitions under different competition systems. The number of single elimination matches is equal to the number of teams minus one. It is known that there are 13 football teams participating, so the number of people in a single elimination match is 12. In the match with 13 football team, if the elimination system is adopted, it will take 12 games to decide the champion.
Extended data:
Ordinary match system of football match
Most leagues adopt a round robin system, and each team must compete with other teams at least once. According to the number of times the two teams meet, they are divided into single-cycle and double-cycle competitions. For football matches, leagues are usually used for fixed long-term events, and tournaments with a large number of teams are usually graded. After each game, they will be promoted or demoted according to the results of the game.
The league system can refer to the China Professional Football League of Super League, China League and China League. The league ranking adopts the point system, winning a game with 3 points, drawing a game with 1 point and losing a game with 0 points. In the case of the same score, generally consider: the number of goal difference, goals, red cards and yellow cards, as well as the total number of goal difference, goals, red cards and yellow cards.