The Union of European Football Associations is currently reviewing the away goals rule during extra time in the knockout rounds of the Champions League. We model extra time as a two-stage contest. Assuming a home-field advantage we analyze the effect of the away goals rule on the competitive balance between teams. Our analysis suggests that the away goals rule levels the competitive imbalance introduced by the home-field advantage in the quarter and semi-finals and that in the round of 16 weaker teams should play first home and then away so that they benefit from the away goals rule during extra time.

中文翻译：

---

加时赛中的竞争平衡和客场进球规则

欧洲足球协会联盟目前正在审查欧冠淘汰赛加时赛客场进球规则。我们将加时赛建模为两阶段比赛。假设主场优势，我们分析客场进球规则对球队之间竞争平衡的影响。我们的分析表明，客场进球规则平衡了四分之一决赛和半决赛主场优势所带来的竞争不平衡，在这一轮中，16 支实力较弱的球队应该先主场后客场比赛，这样他们才能从客场进球中受益。加时赛的规则。