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A defensive player may line up anywhere on his side of the line of scrimmage and perform any legal action. Over time, however, defensive roles have become defined into three main sets of players that encompass several individual positions. Defensive formations are often known by a numerical code indicating the number of players at each position.
A diagram of a standard 4–3 defense set. The defensive backs include two cornerbacks (labeled CB on the diagram), a free safety (labeled FS) and a strong safety (labeled SS). In gridiron football , defensive backs ( DBs ), also called the secondary , are the players on the defensive side of the ball who play farthest back from the line of ...
The three basic defensive positions are: Defensive lineman (DL): Linemen play at the line of scrimmage, directly across from the offensive line. They are categorized as defensive tackles (DT) or defensive ends (DE). The 4-3 defense has 2 tackles and 2 ends; the 3-4 defense has 2 ends and 1 tackle, who is sometimes called a nose tackle (NT) to ...
Also called the "umbrella" defense or "3-deep". In this set, the third safety would be referred to as a "weak safety" (WS) and allows two position safeties at the mid-level with a third safety deep. It is because of this that the secondary safety in a football defense is called a free safety rather than a weak safety
A player position on the defensive team, the monster is a strong safety in a four-deep secondary with the ability to cover deep zones, defend against runs and, on occasion, play on the line of scrimmage. [26] See strong safety motion
This defense is generally considered to be the best balanced arrangement against a well balanced attack, Dana X. Bible, Championship Football, 1947, p. 154 Single wing offense versus a 6–2. This shows a refinement of the 8 man front, where the cornerback clamps tight on the wingback, presenting a de facto 9 man line to the single wing offense.
The positions in American football. The offense is shown in an I-formation and the defense is shown in a 4-3. Date: 30 June 2007: Source: Own work: Author: UserB: Permission (Reusing this file) I do not believe that this image qualifies for copyright protection. In the event that it does, I irrevocably release all rights to it.
In American football, the 3–4 defense is a common defensive alignment consisting of three down linemen and four linebackers. It is called a "base defense" because it will readily switch to other defensive alignments (such as a nickel defense or a dime defense ) as circumstances change.