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A 4–3 base defense. In American football, a 4–3 defense is a defensive alignment consisting of four down linemen and three linebackers. It is called a "base defense" because it is the default defensive alignment used on "base downs" (1st and 2nd downs). However, defenses will readily switch to other defensive alignments (such as a nickel ...
On plays where the defense expects the offense to pass, naming 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]).
Basic 3–4. This is the base defense of some teams. It consists of three defensive linemen, four linebackers, and four defensive backs (two safeties, two corners). The advantage is that while 4 players still usually rush the line, the quarterback can be less sure of which of the 4 linebackers will join the 3 linemen.
American football positions. A diagram showing an I formation on offense and a 4-3 formation on defense. In American football, the specific role that a player takes on the field is referred to as their "position". Under the modern rules of American football, both teams are allowed 11 players [ 1] on the field at one time and have "unlimited ...
The 3–4 defense was originally devised by Bud Wilkinson at the University of Oklahoma in the 1940s as the 5–2 Oklahoma defense. The first NFL team to regularly employ the 3–4 was the 1974 New England Patriots under Chuck Fairbanks , who employed the 5–2 for all but one of his six seasons (1967–72) as head coach of the Oklahoma Sooners ...
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.
American football rules. Gameplay in American football consists of a series of downs, individual plays of short duration, outside of which the ball is or is not in play. These can be plays from scrimmage – passes, runs, punts or field goal attempts (from either a place kick or a drop kick) – or free kicks such as kickoffs and fair catch kicks.
46 defense. 46 Formation, original 4–3 base set. The 46 defense is an American football defensive formation, an eight men in the box defense, with six players along the line of scrimmage. [ 1] There are two players at linebacker depth playing linebacker technique, and then three defensive backs. The 46 defense was originally developed and ...
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