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  2. American football rules - Wikipedia

    en.wikipedia.org/wiki/American_football_rules

    Defensive penalties result in the ball moving up to the 1-yard line, while a second defensive penalty on any play, even in future rounds, results in a score awarded to the offensive team. To speed up the overtime process, both teams' offense and defense are on the field at the appropriate end zone.

  3. Offside (American football) - Wikipedia

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

    Prior to 1925, a call of offside against a defensive unit brought with it an automatic first down in addition to a five-yard advancement of the ball for the offense. [2] However, a December 1924 meeting of the Football Coaches' Association of America spurred a change of rules for the 1925 season eliminating the provision for an automatic first ...

  4. American football positions - Wikipedia

    en.wikipedia.org/wiki/American_football_positions

    The two most common formations are the 3–4 defense and the 4–3 defense, where the first number refers to the number of defensive linemen, and the second number refers to the number of linebackers (the number of defensive backs can be inferred, since there must be eleven players on the field). Thus, a 3–4 defense consists of three ...

  5. Glossary of American football terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_American...

    The 6–2 defense and the 5–3 defense were considered the standard defensive formations of their time, with the 6–2 defense being regarded as the defense that was stronger against the run. As the T formation became more popular, the popularity of the 6–2 defense declined.

  6. Encroachment (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Encroachment_(gridiron...

    In the NFL, encroachment occurs when, before the snap, a defensive player illegally crosses the line of scrimmage and makes contact with an opponent or has a clear path to the quarterback. Play is immediately stopped, just as it is with a false start (this violation would be an offside penalty in the NCAA).

  7. Penalty (gridiron football) - Wikipedia

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

    NFL back judge Lee Dyer retrieves a penalty flag on the field during a game on November 16, 2008 between the San Francisco 49ers and St. Louis Rams.. In gridiron football, a penalty is a sanction assessed against a team for a violation of the rules, called a foul. [1]

  8. List of formations in American football - Wikipedia

    en.wikipedia.org/wiki/List_of_formations_in...

    The 5–2. If the defensive ends drop into pass coverage, this formation becomes functionally equivalent to a 4-3. The 5–2 defense consists of five defensive linemen, two linebackers, and four defensive backs (two corners, two safeties).

  9. Blocking below the waist - Wikipedia

    en.wikipedia.org/wiki/Blocking_below_the_waist

    [1] [2] The penalty for a block below the waist is 15 yards in the NFL, NCAA, and in high school. The block is illegal unless it is against the ball carrier. [3] In the NFL, blocking below the waist is illegal during kicking plays and after a change of possession.