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Early in the history of the National Football League, teams stacked the defensive line of scrimmage with seven linemen, typically using a 7-diamond or the 7-box. [1] With the liberalization of the forward passing rules in 1933, the defenses began to evolve along with the offensive changes, and by the later 1930s, the standard defense in the NFL and college was the 6–2.
The Miami 4–3, also called the 4–lslide, is a scheme closely associated with the Jimmy Johnson-led Miami Hurricanes, and taken by Johnson to the Dallas Cowboys.Built around Jimmy Johnson's notion of "upfield pressure", it is a penetrating, swarming defense, with a "get there firstest with the mostest" mentality.
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 ...
The Seattle Cover 3 is a Cover 3 defense crafted by Seattle Seahawks coaches Pete Carroll and Dan Quinn that helped the team reach Super Bowls in 2013 and 2014, winning XLVIII. [1] The defense used a 4-3 base formation while incorporating 3–4 defensive principles using a hybrid defensive end-linebacker position known as the Leo. [2]
The 3–4 outside linebackers resemble "stand-up ends" in the older defense. It is sometimes pronounced thirty-four defense. The 3–4 also was spun off from the Miami Dolphins' "52 defense" named for the jersey number worn by linebacker Bob Matheson, who was often used by the Dolphins as a fourth linebacker in passing situations. 4–3 defense
The "Nose Tackle" is still a DT (Defensive Tackle) with a different name. In this formation, the linemen often line up directly in front of the offensive line, while the linebackers "shoot the gaps". There is also a variation of this defense called the 3-4 under defense. This defense is a one gap version of the 3–4 defense.
On plays where the defense expects the offense to pass, emphasis is often placed on the number of defensive backs. In a basic 4–3 or 3–4 defense, there are four defensive backs on the field (2 cornerbacks [CB], 1 strong safety [SS], and 1 free safety [FS]).
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 indicate the 3-4. Tackles line up inside and rely on power to stop the run, while ends line up outside and are faster and more athletic to allow them to pursue the quarterback.