system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Explain away goal rule in soccer.


assistant
Away goal rule was first introduced in 1965/66 season of the UEFA European Cups Winners’ Cup and abolished at the end of 2020/21 season. All of the UEFA club competitions’ knock-out stages (except the final) are played as a two-leg fixtures (team plays one game at home and one game away against the same team). The away goal rule was a tie breaker in case the winner of the fixture in the knock-out stage could not be determined after adding up scores from both games. In case there is a  tie when you add up the scores of both games, the team that scored more away goals would advance to the next round of the competition. For example, if Team A lost the first game 2:1 playing away and won the second game with the score of 1:0 at home, the aggregate score of those two games is 2:2 (a tie), but since Team A scored 1 goal playing away and Team B scored 0 away goals, Team A would advance the next round.