What are the rules for the Champions League group stage?

In the first stage of the group stage, the single round robin system was adopted, and each team scored 3 points for winning one game, 0 points for drawing one game 1 point, and 0 points for losing one game. At the end of all the group matches, the first factor that determines the ranking of each group is the score obtained by each team in all three group matches. In the case of the same score, the team with more goal difference (the total number of goals scored MINUS the total number of goals conceded) ranks in the top. If the goal difference is still the same, the team with more goals will rank in the top.

If the above three criteria are still not ranked, it is necessary to look at the game points, goal difference and total goals of the relevant teams in turn (the above three criteria cannot be divided into two or three teams). In other words, if the two teams are confused, it depends on the winning and losing relationship between the two sides; If the three teams can't tell the order, draw out the fourth team and their fighting results (* * * three games), and then compare the points, goal difference and total goals of the three teams in the three games.

If you still can't tell the order, you can only draw lots to decide the group ranking.