The advantage of being divided into four groups is that the competition can be conducted effectively. For example, on Saturday, the first group is at 10 am, the second group is at 13 am, the third group is at 15 am, and the fourth group is at 17 am (of course, the specific time can be set by yourself). In this way, you can play up to four games a day, and you can also avoid the unfairness of elastic bands. It is recommended to play once a week to prevent players from overworking. If there is really no time, it is necessary to draw lots to decide the order of the teams.
In this way, three teams in each group play three games, and four groups play 12 games.
If the top two points of a group are the same, it depends on the outcome between them, and the winner will qualify; If the outcome is the same, look at the goal difference; The same goal difference depends on the number of goals scored; If the number of goals is the same, you can also watch the red and yellow cards (the specific arrangement is not necessarily as mentioned above, but it is reasonable). If it's all the same, the two teams will play again until the penalty is decided.
If a group of three teams are all 1 win 1 negative, and the scores are all the same, then red and yellow cards can be considered. Rule out one team first, and the remaining two teams will play again. If fairness must be considered, the order can be decided by drawing lots. First, the two teams will decide the outcome, and then the third team will decide the outcome (in short, there are many ways, depending on the specific situation).