The three-part definition of the modern offside law can be remembered as ‘PIG’ – if a player doesn’t Play, Interfere or Gain, he is not offside.Confused? Did you think that Jérémie Aliadière’s goal for Middlesbrough (video) against Arsenal the other day was offside? Do you think that if you had 10 referees in a room you would get 10 different decisions ? If so you need to read this article.All will be made clear.