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The Seattle 4–3 hybrid defense is based on the 4–3 under front used by Monte Kiffin. Unlike the standard 4–3 under, in which all the defensive linemen employ one gap techniques, the Seattle variant has a split personality. In its best known form, half the line uses 3-4 two gap principles, while the other half acts like a one gap 4–3.
By far the most common alignments are four down linemen and three linebackers (a "4–3" defense), or three down linemen and four linebackers ("3–4"), but other formations such as five linemen and two linebackers ("5–2"), or three linemen, three linebackers, and five defensive backs ("3–3–5") are also used by a number of teams.
The area occupied by defensive linemen and linebackers is often referred to as "the box". The box is usually about 3-5 yards in depth and spans the offensive line in width. . Normally five to seven defensive players occupy this area but frequently another player is brought into the box for run support against smashmouth-oriented offensive teams or short yardage situat
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.
The defense was ranked 25th in 1996, and in his first year back they dropped to 28th and allowed just over 400 points. In 1998 they remained 28th in the NFL (of 30 teams) and allowed 452 points. In 1999 the zone blitz scheme began to take hold and although the Bengals defense allowed 460 points, they improved to 25th in the NFL (out of 31 teams).
Note that in this defense, if you pull the middle guard and replace him with a middle linebacker, you get to an early version of the 4–3 defense. [7] Conversely, if you take a 4–3 defense and replace the middle linebacker with a middle guard, then you convert a 4–3 into a 5–2 Eagle.
The 5–3 was regarded as a pass defense, the 6–2 the run defense. [4] The usage of the 5–3 defense accelerated as the T formation became more popular and more effective. [5] Dana Bible, in his 1947 coaching tome, called it the best defense against the T formation. [6] By 1950, the base defenses in the NFL were all five man line defenses ...
Players considered to be edge rushers are usually 4–3 defensive ends or 3–4 outside linebackers.Note that 3–4 outside linebackers often act as an extension of the defensive line, in that they will attack the offensive tackles or blocking tight ends on the majority of their snaps under a majority of 3–4 schemes, though it is not uncommon to see them drop back and play a more traditional ...