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During the game, the officials are assisted in the administration of the game by other persons, including a clock operator to start and stop the game clock (and possibly also the play clock); a chain crew who hold the down indicator and the line-to-gain chains on the sideline; and ball boys, who provide footballs to officials between downs (e.g ...
The first American football game was played on November 6, 1869, between two college teams, Rutgers and Princeton, using rules based on the rules of soccer at the time. A set of rule changes drawn up from 1880 onward by Walter Camp , the "Father of American Football", established the snap , the line of scrimmage , eleven-player teams, and the ...
The first American football game was played on November 6, 1869, between two college teams, Rutgers and Princeton, using rules based on the rules of soccer at the time. A set of rule changes drawn up from 1880 onward by Walter Camp , the "Father of American Football", established the snap , the line of scrimmage , eleven-player teams, and the ...
In American football, the specific role that a player takes on the field is referred to as their "position". Under the modern rules of American football, both teams are allowed 11 players [1] on the field at one time and have "unlimited free substitutions", meaning that they may change any number of players during any "dead ball" situation.
The "two platoons", offense and defense, are an integral part of the game today. Although professional football has uninterruptedly retained the two-platoon system since 1949, in 1953 the NCAA took the collegiate game back to the one-platoon system with new limited substitution rules, changes made ostensibly for financial and competitive reasons.
American football rules allow each team to have three timeouts in each half, and the NCAA, NFL & Texas high school football stops play for a "two-minute warning". Before 2024, NCAA football had no two-minute warning, so the clock stopped on a first down until the ball is ready for play if the play ended in the field of play.
American 7s Football League (A7FL) is a semi-professional league which plays a seven-man version of gridiron football, while the American Flag Football League plays a variant of American football where, instead of tackling players to the ground, the defensive team must remove a flag or flag belt from the ball carrier to end a down.
In gridiron football, clock management is an aspect of game strategy that focuses on the game clock and/or play clock to achieve a desired result, typically near the end of a match. Depending on the game situation, clock management may entail playing in a manner that either slows or quickens the time elapsed from the game clock, to either ...