BingBumpier
BingBumpier
There is no shortage of articles restating the offside law. They are all accurate and almost none of them help, because reading a definition is not the skill you need. The skill you need is a procedure you can run in the two seconds between a pass and a flag, on a play you are watching once, from a camera angle that is actively misleading you.
So this is a procedure, not a definition. Three steps, then the specific scenarios that cause arguments, then the single reason correct offside calls look wrong on television more often than anything else in sport.
Run these in order. If any step gives you a "no", stop: there is no offence.
Step two is a snapshot. Step three is everything that happens afterward. Almost every argument you will ever have about offside comes from someone collapsing those two steps into one.
The three conditions matter individually, and each one kills calls that fans expect to be given.
The opponents' half. You cannot be offside in your own half. A player standing entirely in their own half when the ball is played is not in an offside position no matter where the defenders are.
Nearer the goal line than the ball. This is the condition people forget. If the ball is ahead of you, you cannot be offside from it, which is why a teammate rolling the ball backwards to you is never an offside offence regardless of the defensive line.
Nearer the goal line than the second-last opponent. Note the wording: second-last opponent, not "the goalkeeper and one defender". Usually the keeper is one of the two, so the shorthand works. When the keeper has charged upfield for a late corner, or has come out to the edge of the box and been bypassed, the two relevant opponents are outfield defenders, and attackers who look hopelessly offside next to an empty goal frequently are not.
Two refinements worth knowing. Arms and hands are excluded from the measurement, for attackers and defenders alike, because you cannot legally score with them; only the parts you can score with count. And being exactly level with the second-last opponent is onside. Ties go to the attacker, deliberately, because the law has been loosened in the attacker's favour repeatedly over its long history rather than tightened.
Standing in an offside position is not an offence and never has been. Players drift into offside positions constantly and no flag goes up. An offside-positioned player is penalised only if they become involved in active play, which in practice means one of three things: they play or touch the ball; they interfere with an opponent by obstructing the goalkeeper's line of vision, challenging for the ball, or making a movement that clearly affects an opponent's ability to play it; or they gain an advantage by picking up a ball that has rebounded off a post, the crossbar, a match official, or an opponent.
That last category is where new fans get blindsided. An attacker who was offside when the shot was struck, stands still, watches the ball come back off the crossbar and taps it in, has committed an offside offence. Nothing about "standing still" protects him, because collecting the rebound is gaining an advantage from the offside position.
Here is the one to learn properly, because it settles a large share of the calls that look wrong.
If a defender deliberately plays the ball, and it reaches an attacker who was in an offside position, the attacker is not penalised. The defender's deliberate action effectively resets the situation. A defender who casually heads a loose ball back toward his own goal and accidentally feeds a striker has given up a legitimate goal.
If the ball merely deflects off a defender, nothing resets. An unintentional ricochet off a shin, a blocked cross, a lunging interception that goes wrong: the attacker is still offside.
There is one carve-out that catches people every time. A deliberate save does not count as deliberate play. If a goalkeeper, or any defender, deliberately stops a ball heading into or close to the goal and it rebounds to an offside-positioned attacker, the attacker is offside. A save is deliberate, but it is treated separately precisely so that attackers cannot camp on rebounds.
Judging deliberate play from deflection is genuinely difficult, and referees are given things to weigh rather than a bright line: whether the defender had clear sight of the ball, whether the ball was travelling fast or arriving unexpectedly, whether it had already deflected off someone else, whether the defender had time to organise their body, and whether a ball on the ground is easier to control than one in the air. If you find yourself disagreeing with a decision in this area, you are disagreeing with a judgement call, not with the law.
| Situation | Call | Why |
|---|---|---|
| Attacker exactly level with the second-last defender when the pass is played, runs on, scores | Onside | Level is onside. Ties go to the attacker. |
| Attacker onside when the pass is played, sprints past the defensive line while the ball is in flight | Onside | Position is judged at the moment the ball is played, not when it arrives. This is the whole art of the timed run. |
| Teammate further upfield rolls the ball backwards to a player beyond the defence | Onside | The receiver is not nearer the goal line than the ball, so no offside position exists. |
| Attacker in an offside position when the pass is played, then runs back level before touching it | Offside | You cannot un-offside yourself by retreating. The snapshot was already taken. |
| Pass deflects off a defender's shin into an offside-positioned attacker's path | Offside | A deflection is not a deliberate play and resets nothing. |
| Defender deliberately heads a clearance straight to an offside-positioned attacker | Onside | Deliberate play by an opponent means the attacker is not penalised. |
| Goalkeeper parries a shot into the path of an attacker who was offside when it was struck | Offside | A deliberate save is the exception to the deliberate-play rule. |
| Shot rebounds off the post to an attacker who was offside when it was struck | Offside | Gaining an advantage from a rebound off the frame of the goal. |
| Attacker receives the ball directly from a throw-in while standing behind the defence | Onside | No offside offence directly from a throw-in. |
| Same, directly from a corner kick or a goal kick | Onside | Same exemption. It is why attackers stand in apparently illegal spots at corners. |
| Attacker stands offside directly in the goalkeeper's eyeline as a teammate's shot goes in | Offside | Obstructing the goalkeeper's line of vision is interfering with an opponent, even without a touch. |
| Attacker loiters offside on the far touchline while a goal is scored on the other side | Onside | Offside position without involvement is not an offence. |
| Goalkeeper has gone up for a corner; two outfield defenders are the last men back | Depends on those two | The test is the second-last opponent, whoever that is. The keeper is not special. |
| Attacker's trailing arm is past the last defender, everything else is level | Onside | Arms are not measured, because you cannot score with them. |
One practical footnote: the restart for offside is an indirect free kick to the defending team, taken from where the offence occurred, which is why you sometimes see the ball brought back to a spot well behind where the flag went up.
This is the most useful thing in this article, and almost no explainer mentions it.
Offside is a question about a line drawn across the pitch, parallel to the goal line, through the second-last defender. To judge whether an attacker is beyond that line, you must view it from somewhere on the line itself. An assistant referee sprints up and down the touchline for ninety minutes for exactly this reason: their job is to be level with the defensive line at the moment the ball is played.
Your television is not there. The main broadcast camera sits high near the halfway line, which means that for any incident happening thirty yards away, you are looking at the defensive line at an angle. That angle produces parallax: the player nearer to the camera appears further up the pitch than he is, and the player further away appears further back. On a close call, a broadcast wide shot can make an onside attacker look a yard offside, or the reverse, with complete conviction.
So the rule for watching at home is simple and it will spare you a lot of pointless anger. If the replay is not from a camera roughly square to the defensive line, the replay is not evidence. Give the assistant referee, who was standing in the right place, the benefit of the doubt. The angled shot with a graphic slapped on it is worth less than the flag.
It also explains something people find suspicious: why a decision reversed by video review often looks obviously wrong on the first replay and obviously right on the fourth. Nothing changed except the camera.
Video assistant referees came into the top levels of the game in the late 2010s, and for offside they did something narrower than most fans realise. They did not change the law. They changed the tolerance.
Before video review, an assistant referee judged a moving line against a moving player with the naked eye and was expected to miss by a small margin. That margin functioned as an unwritten benefit of the doubt, and attackers lived inside it. Video review removed it. A frame is chosen, a calibrated line is drawn, and a striker's shoulder ahead of a defender's knee is an offence exactly as much as being five yards clear.
Semi-automated systems have since sped this up considerably, using limb tracking and sensing inside the ball to identify the moment of the pass and the player positions around it; the men's World Cup in 2022 was the first major tournament to use technology of that kind. The checks that once took three minutes now often take seconds.
What has not been resolved is the argument underneath, and it is a real one rather than fan grumbling. The offside law exists to stop players camping behind the defence. A striker ahead by the width of an armpit is not camping. Whether the law should carry an explicit tolerance so that only clear offsides are penalised has been debated seriously within the game for years, and reasonable people land in different places. You are allowed an opinion. Everyone has one.
Pick one half of one match and watch the second-last defender instead of the ball. You will find the defensive line moves as a unit, steps up together, and that the moment of the pass is genuinely visible if you are looking for it. Then start calling it out loud before the flag, using the three steps: freeze the pass, check the position, check the involvement.
You will be wrong often at first, mostly on step one, because the instinct is to judge the moment the ball arrives. Once that instinct flips, offside stops being a mystery and becomes what it is for experienced fans: a fast, mostly obvious judgement with a handful of genuinely hard edge cases, all of which are in the table above.
Read next: Understanding Ice Hockey Rules for New Fans · Rugby: A Plain Explanation Of A Confusing Sport