I was watching the two big games in the Champions League this week and both of the games were spoiled by the red cards (the card in the City-Barca game was a clear red as it was a clear clear goal scoring opportunity whereas the Arsenal-Bayern game was not so clear cut). It got me thinking;
1: when was the rule around clear goal scoring opportunities introduced and
2: was there a case that made them introduce it? I'm thinking something like when they clamped down on tackles from behind because it was this kind of tackle that forced Marco Van Basten into early retirement or Lampard's goal in the 2010 World Cup which got a debate on goal line technology going.