Ken Aston is an English school teacher who refereed in the 1962 World Cup's 'Battle of Santiago' between Italy and Chile -- one of the most violent games in the tournament's history. That match influenced Aston to devise something that's part and parcel of football these days but was used at the World Cup for the first time in 1970. What are we talking about?
a. Substitutions for injured players
b. Stoppage time
c. Yellow and Red cards
d. Usage of whistles
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substitution for injured player
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