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Cover 4, or quarters, refers to 4 deep defenders each guarding one-fourth of the deep zone. Cover 4 schemes are almost always used to defend against deep passes. [10] (See also Prevent defense). The most basic Cover 4 scheme involves 3 CBs and 2 safeties. Upon snap, the CBs work for depth, backpedaling into their assigned zone.
Base 4–4 defense. In American football, the 4–4 defense is a defensive alignment consisting of four down linemen and four linebackers.. Originally seen as a passing defense against the spread, modern versions of the 4-4 are attacking defenses stocked with multiple blitz packages that can easily be concealed and altered.
The middle or inside linebacker (MLB or ILB), sometimes called the "Mike" or "Mac", [15] is often referred to as the "quarterback of the defense". [16] Often it is the middle linebacker who receives the defensive play calls from the sideline and relays that play to the rest of the team, and in the NFL he is usually the defensive player with the electronic sideline communicator.
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 ...
4–2–5 nickel defense 4–2–5. There are a couple paths to the 4–2–5. One is by removing a linebacker from the standard 4–3 to add the extra defensive back. The second is by converting the ends of a wide tackle six to safeties (the defensive ends of a wide tackle six already have pass defense responsibilities).
A professional derivative in the 1970s of the earlier Oklahoma, 5–2 or 50 defense, which had five linemen and two linebackers. 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 ...
Like a Sam linebacker in a 4–3 scheme, the other 3–4 OLB must be able to cover, blitz, and play the run. Strengths of the 3–4 include speedy ILBs and OLBs in pursuit of backs in run defense and flexibility to use multiple rushers to confuse the quarterback during passing plays without being forced into man-to-man defense on receivers.
The Tampa 2 is typically employed out of a 4–3 defensive alignment, which consists of four linemen, three linebackers, two cornerbacks, and two safeties. The defense is similar to a Cover 2 defense, except the middle linebacker drops into a deep middle coverage for a Cover 3 when he reads a pass play. [1]