One of our favorite soccer scribes, David Falk, recently checked in with Seattle-area referee Ray Moffatte on the all-too-complex Law 11. Moffatte says to simplify things, think of the word PIG:
The “P” stands for position. Was the player receiving the pass in an offside position when the ball was played by a teammate?
The “I” stands for involved. Was the player who was in an offside position involved in the play? Sometimes a player who was in an offside position will clearly indicate that they are not playing the ball thus allowing a teammate who was in an onside to play the ball.
The “G” stands for gains and advantage. Does the player in an offside position gain an advantage by being in that position? One example being, a player in an offside position shielding a goalkeeper from playing the ball that is shot towards the goal. Another example is when a player is in an offside position when a shot is taken and then scoring on a rebound off the goalkeeper or a rebound off the frame of the goal.