Had an interesting chat yesterday with a ref in my Sunday league about whether a player in an offside position is interfering with play or not.
My point to him was that if a defender reacts to a player in an offside position, then he should be given offside as he has affected play by pulling the defender out of position. The ref said this was incorrect according to FIFAs rules on interpreting the offside law. By their guidelines, the attacking player can only be ruled offside if he makes a move to touch the ball (ie. lets the ball deliberately run through his legs) even if he then doesn't make contact whether on purpose or not. So apparently, if you are offside but not close to the ball you are able to make a run that drags a defender so an onside player can take advantage of the situation.
It used to be so much simpler when I was a kid. You just kicked something, flesh or leather, it was all the same. Different game nowadays.