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Offside explained — the rule that confuses everyone (now with robots)
💡 Offside prevents goal-hanging — and the 2026 World Cup's semi-automated system tracks 29 body points per player to call it within millimeters.
The offside rule is the most debated and misunderstood rule in football. Here's the simple version: when a teammate passes you the ball, you must have at least two opponents (usually the goalkeeper and one defender) between you and the goal line at the moment the ball is played. If you don't, you're offside, and the other team gets a free kick.
The rule exists to prevent "goal-hanging" — a player simply standing next to the opposing goal waiting for long balls. Without offside, football would devolve into a chaotic game of long punts with forwards camping at the goal.
At the 2026 World Cup, FIFA is using semi-automated offside technology (SAOT) — a system of 12 cameras tracking 29 body points on each player at 50 times per second. When a potential offside occurs, the system generates a 3D animation showing exactly where every player was at the moment of the pass. Decisions that once took minutes of VAR review now take seconds, and the accuracy is within millimeters.