The Offside Rule Explained Simply
Ask ten football fans to explain offside and you might get ten different answers. Yet the rule itself is quite simple once you break it into small pieces. Let's do exactly that.
The basic idea
A player is in an offside position if, at the moment a teammate plays the ball to them, they are nearer to the opponent's goal line than both the ball and the second-last defender. In most cases the "last defender" is the goalkeeper, so in practice the attacker must not be behind the last outfield defender when the pass is made.
Being offside is not always an offence
Here is the part many people miss: simply standing in an offside position is not a foul. The referee only blows the whistle when the player in that position becomes involved in play, for example by:
- playing or touching the ball,
- blocking the goalkeeper's view,
- challenging an opponent for the ball, or
- gaining an advantage from a rebound off the post, the crossbar or a defender.
When you can never be offside
- In your own half of the pitch.
- If you are level with the second-last defender (level is onside).
- Directly from a goal kick, a throw-in or a corner kick.
Which body parts count?
Only the parts of the body you can legally score with count: the head, body and feet. Hands and arms do not count, for attackers or defenders. That is why modern offside lines on television are drawn from a shoulder, a knee or a boot, never from a hand.
Why the rule exists
Without offside, a team could leave one striker standing next to the opponent's goalkeeper all match, waiting for long balls. The rule forces attackers to time their runs, and it rewards clever movement. Watch a top striker like a hawk and you will see them drifting along the defensive line, waiting for the exact moment to sprint in behind.
A quick example
A midfielder passes forward. At that moment the striker is half a step behind the last defender. Flag up: offside. If the striker had stayed level and only started running after the pass was played, it would be a perfectly good goal.
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