At the heart of football's appeal is its simplicity: the team with the most goals wins.
Except that is when it comes to two-legged cup matches, when the away-goals rule kicks in.
Bayern Munich is the latest beneficiary of the rule that makes away goals count double, with Arsenal having nothing to show for ending the German team's 23-game unbeaten run when they met in the Champions League on Wednesday.
A 3-1 deficit from the first leg in London was overturned by Arsenal unexpectedly winning 2-0 in Munich, but the 3-3 aggregate score didn't push the game into extra time as Bayern advanced to the quarterfinals. Had the second leg ended 3-1 the teams would have been forced to play extra time and potentially contest a penalty shootout.
Even Bayern chairman Karl-Heinz Rummenigge acknowledged: ''We were lucky to have scored enough goals in London.''
Two years ago, Bayern fell victim to the away-goals rule at the last-16 stage in the Champions League. Despite winning 1-0 at Inter Milan...