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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 substitution of absent players happened as early as the 1850s, for example from Eton College where the term emergencies is used. [5] Numerous references to players acting as a "substitute" occur in matches in the mid-1860s [6] where it is not indicated whether these were replacements of absent players or of players injured during the match.
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.
A major change in the governing rules of the sport was made ahead of the 1941 college football season. Instead of removed players being lost for the quarter, a new unlimited substitution rule was implemented, providing simply, "A player may be substituted for another at any time, but such player may not be withdrawn from, nor the outgoing ...
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Substitution (law), the replacement of a judge; Substitution (sport), where a sports team is able to change one player for another during a match; Substitution therapy or opiate replacement therapy; Import substitution industrialization, a trade and economic policy; Penal substitution, a theory of the atonement within Christian theology
A platoon system in baseball or American football is a method for substituting players in groups (platoons), to keep complementary players together during playing time.. In baseball, it is usually used to optimize batting performance against pitchers of opposite handedness.
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