


By contrast, when the attacker passes the defender on the inside, he appears not to be offside, when in fact he is. So the latter raises his flag and the referee blows his whistle, cancelling the attack. the defender is between the assistant referee and the attacker) who is in line with the defender, is projected on the assistant referee's retina to the right of the defender. This has nothing to do with the quality of the assistant referees, say the authors, but with the inability of the human eye to interpret the incoming visual information.įrom the assistant referee's standpoint - just beyond the last defender - an attacker on the outside (i.e. The assistant referees have to judge if this is the case, but make a wrong decision one out of five times. The offside rule says that a player, heading for the goal, must have at least two defenders standing between him and the goal on the moment when the ball is being passed to him. The misjudgments, they write in this weeks Nature, are probably because of the viewpoint the assistant referees have, when they take position along the sideline, just beyond the last defender. They investigated why assistant referees, who are responsible for judging offside, regularly make mistakes. Oudejans and colleagues from the Vrije University of Amsterdam, the Netherlands, taped and watched 200 soccer games from five national leagues and the 1998 world cup.
