Interfering with an Opponent

In this Part 1 section we are going to look at the meaning of "challenging an opponent" for the ball.
In regards to an offside situation, three elements need to be present to meet the criteria for challenging an opponent

  1. Attempts to play
  2. Playing distance
  3. Action that has impact

A player is offside if he clearly attempts to play a ball which is close to him when this action impacts on an opponent.
 

Look at this example from Juventus vs Everton. 
Does the blue player in an offside position clearly attempt to play the ball?
Is the ball close to him?
Does his action impact, in this case, the opposing goalkeeper?

The answer to all three questions is "yes".
This is an offside offense.

 

View the following two situations and decide if they meet the conditions for "challenging an opponent"

Video 1:
 
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“interfering with an opponent” means preventing an opponent from playing or being able to play the ball by clearly obstructing the opponent’s line of vision or challenging an opponent for the ball
— Law 11
 
 
Video 2:
 
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What if a player makes a clear attempt to avoid playing the ball?
FIFA's offside circular offers advice on this type of situation by adding
"...or making an obvious action which clearly impacts the ability of an opponent to play the ball".

Here is a situation where a player in an offside position makes not attempt at the ball, in fact, attempts to avoid playing the ball.  However, his obvious action of attempting to avoid the ball clearly impacts the defender and the goalkeeper.
This is an offside offense.
 

Watch the following clip. 
Does the obvious action of the offside player clearly impact the defender?

Video 3:
 
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A player is offside if he clearly attempts to play a ball which is close to him when this action impacts on an opponent or he makes an obvious action which clearly impacts the ability of an opponent to play the ball.