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  2. Formation (American football) - Wikipedia

    en.wikipedia.org/wiki/Formation_(American_football)

    The offense is required to set up a formation before a play, subject to several rules: The formation must have at least 7 players on the line of scrimmage. [1] The 7 players are not required to be next to each other and may spread out across the width of the field, but this is rare; most offenses place at least 5 players together in a continuous line.

  3. Penalty (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Penalty_(gridiron_football)

    Illegal formation Fewer than seven players line up on the line of scrimmage (NFL/CFL); more than four players in the backfield (NCAA/HS); eligible receivers fail to line up as the leftmost and rightmost players on the line (NFL/CFL); or when five properly numbered ineligible players fail to line up on the line.

  4. Ineligible receiver downfield - Wikipedia

    en.wikipedia.org/wiki/Ineligible_receiver_downfield

    The rule varies among leagues. In the NFL, ineligible receivers must have at least part of their body no more than 1 yard beyond the line of scrimmage when a pass is thrown, unless they are engaged in a continuous block that began prior to leaving the 1-yard zone. In college football, the NCAA allows ineligible receivers a maximum of 3 yards.

  5. Illegal procedure - Wikipedia

    en.wikipedia.org/wiki/Illegal_procedure

    Illegal formation; Kickoff or safety kick out of bounds; Player voluntarily going out of bounds and returning to the field of play on a punt; Some examples of similar penalties have their own signals. Examples include: Illegal shift; Illegal motion; Illegal forward pass; Illegal touching of a forward pass; Ineligible receiver downfield; Illegal ...

  6. Tackle-eligible play - Wikipedia

    en.wikipedia.org/wiki/Tackle-eligible_play

    Tackle-eligibles are effectively illegal at the high school level; the rules of that level do not even allow declaration. The scrimmage kick formation was once exempt from all numbering requirements, but after the A-11 offense employed the formation as a base offense, the rules were modified in February 2009.

  7. Shift (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Shift_(gridiron_football)

    The National Football League (NFL) defines all motion and shift penalties as "illegal motion", [1] while both the NCAA and NFHSAA make a distinction between an "illegal shift" and "illegal motion"; an illegal shift refers to players shifting and not coming to a complete stop before the snap, while illegal motion refers to a player who is in ...

  8. Motion (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Motion_(gridiron_football)

    Tight end Andrew Quarless (81) in motion. In gridiron football, motion refers to the movement of an offensive player at the time of the snap.. While there are different rules regarding motion, most mandate that no more than one player may be in motion at the time of the snap, [1] and the player must not be an offensive lineman (typically, the player in motion is a wide receiver or running back ...

  9. List of gridiron football rules - Wikipedia

    en.wikipedia.org/.../List_of_gridiron_football_rules

    The NCAA Football Rules Committee determines the playing rules for Division I (both Bowl and Championship Subdivisions), II, and III games (the National Association of Intercollegiate Athletics (NAIA) is a separate organization, but uses the NCAA rules). A pass is ruled complete if one of the receiver's feet is inbounds at the time of the catch.