Obviously the whole offside rule sets it apart from GAA in this regard. I'm sure if there was no offside and Drogba was hovering around the goalmouth he would have Skertel or Carragher for company.
And the most common method I would think. Liverpool seem to take the zonal thing to the extreme though. Surely the big ariel players should be the ones man marked. As you rightly said Chelsea have quite a few, Ivanovic is definitely one.
Maybe but I don't think defending a corner has got any more complicated in more recent times.
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