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Brief Communications
Nature 404, 33 (2 March 2000) | doi:10.1038/35003639
Errors in judging 'offside' in football
Raôul R. D. Oudejans1, Raymond Verheijen1, Frank C. Bakker1, Jeroen C. Gerrits1, Marten Steinbrückner1 & Peter J. Beek1
Abstract
In football (soccer), a player is 'offside' if he or she is closer to the goal than the last defender (excluding the goalkeeper) when the ball is passed to them. We investigated why assistant referees, who have the responsibility of judging offside, regularly make mistakes. We show that this is probably due to the angle of viewing by the assistant referee, who is frequently positioned beyond the last defender — a viewpoint from which errors are optically inevitable.
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