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In association football, a substitute is a player who is brought on to the pitch during a match in exchange for an existing player. Substitutions are generally made to replace a player who has become tired or injured, or who is performing poorly, or for tactical reasons (such as bringing a striker on in place of a defender ).
The one-platoon system, also known as "iron man football", is a rule-driven substitution pattern in American football whereby the same players were expected to stay on the field for the entire game, playing both offense and defense as required. Players removed for a substitute were lost to their teams for the duration of the half (until 1932 ...
Free substitution or rolling substitution is a rule in some sports that allows players to enter and leave the game for other players many times during the course of a game, generally during a time-out or other break in live play; and for coaches to bring in and take out players an unlimited number of times.
The two-platoon system is a tactic in American football enabled by rules allowing unlimited substitution adopted during the 1940s. The "two platoons", offense and defense, are an integral part of the game today.
In the National Football League, an illegal procedure is used to refer to a number of different penalties. ... Illegal substitution; Usage at different levels
K-State football coach Chris Klieman successfully used a substitution rule to his advantage and cleverly got the Wildcats’ offense back on the field without making a tackle. Both Klieman and ...
Because of these rules, various leagues have enacted strict rules of uniform numbering so officials may more easily judge which players were eligible and which were not at the start of a play. For example, in college football , ineligible players wear numbers 50–79, while eligible receivers wear 1–49 or 80–99.
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