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In American football, a nickel defense (also known as a 4–2–5 or 3–3–5) is any defensive alignment that uses five defensive backs, of whom the fifth is known as a nickelback. The original and most common form of the nickel defense features four down linemen and two linebackers .
2–4–5 defense A type of nickel formation with two linemen (two defensive ends, DEs, or one DE and one defensive tackle, DT), four linebackers (two interior linebackers, ILBs, and two outer linebackers, OLBs), and five defensive backs (three cornerbacks, CBs, one free safety, FS, and one strong safety, SS).
The 3–3–5 defense can also be referred to as the 3–3 stack or the spread defense. It is one form of the nickel defense , a generic term for a formation with five defensive backs. Veteran college football defensive coordinator Joe Lee Dunn is widely credited with being the main innovator of the 3–3–5 scheme.
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).
In American football, a nickelback is a cornerback or safety who serves as the additional defensive back in a nickel defense. A base defense consists of two cornerbacks and two safeties, making the nickelback the fifth defensive back on the field, thus tying the name of the position to the name of the North American 5-cent piece.
However, the coverage played by defense does not always easily allow assignment of such distinct names for safeties. A formation with more than two safeties could have them described by their relative geometric placement—outside, shallow, deep, etc.-but such is not general practice; however, see the discussion of the "nickel" below.
The prevent defense is a defensive alignment in American football that seeks to prevent the offense from completing a long pass or scoring a touchdown in a single play and seeks to run out the clock, at the expense of allowing short-yardage gains. It is used by a defense that is winning by more than a touchdown, late in the fourth quarter, or ...
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