Formation (American football)

A formation in American football refers to the position players line up in before the start of a down. There are both offensive and defensive formations and there are many formations in both categories.

The Offense

At the highest level of play in the NFL and NCAA, the one constant in all formations is the offensive line, consisting of the left and right tackle, left and right guard, and a center. These five positions are often referred to collectively as the "line", and have the primary role of blocking. By rule there must be two additional players on the line of scrimmage called Ends. These players are eligible receivers and may play near the linemen (tight ends) or farther away (split end or wide receiver). Most teams play additional players near (but still off) the line of scrimmage to act as extra pass receivers.

Offensive Positions

Of the four players behind the line, one is always the quarterback (defined as the player who receives the ball from the center). The quarterback has four options once he receives the ball:

• He may keep the ball and run with it
• He may hand or pitch the ball laterally or backwards to another player, who may then run or throw a forward pass
• He may throw a forward pass to an eligible receiver
• He may punt the ball to the other team

The three other backs can be half backs, (who primarily carry the ball), fullbacks, (who primarily block), or they can play near (but not on) the line of scrimmage to act as extra tight ends or wide receivers. A tight end that fills the role as the 4th back is often called an "H-Back" and a wide receiver that fills that role is sometimes known as a "flanker" or a "slot" receiver (depending on where he lines up). Most formations have a "strong" side (the side with the tight end, or the side with more players) and a "weak side" (the side opposite the tight end, or the side with fewer players).

The ends, which may be either wide receivers, or tight ends, may catch a passed ball or receive a handoff.

Below are the most common and historically significant offensive formations, along with descriptions and diagrams to display each. In each case, the diagrams will use the following symbols:

• QB = quarterback (the player who receives the snap to start the play)
• C = center (always the player who snaps the ball)
• G = guard
• T = tackle
• TE = tight end (also for H-back)
• WR = wide receiver (split end, flanker or slot receiver)
• HB = half back (the primary ball carrier)
• FB = full back (the primary blocking back)

This list is not exhaustive; there are hundreds of different ways to organize a team's players while still remaining within the "7 on the line 4 in the backfield convention". Still, this list of formations covers enough of the basics that almost every formation can be considered a variant of the ones listed below.

Rules

The offense is required to set up a formation before a play, subject to several rules:

• The formation must have at least 7 players on the line of scrimmage. The 7 players are not required to be next to each other, so they may spread out across the width of the field, but this is rare; most offenses place at least 5 players together in a continuous line. Although it is rare (because it reduces the number of eligible receivers), teams may place more than 7 players on the line
• The other players not on the line (usually 4 in number) may be positioned anywhere, but all must be at least 1 yard behind the 7 or more players on the line of scrimmage. The traditional saying is "7 on the line, 4 in the backfield" but this is something of a misnomer, as "backfield" usually refers to the area directly behind the offensive line. 3 of the 4 "backfield" players (i.e., the 3 not receiving the snap from center) may line up as wide receivers as long as they are behind the line of scrimmage; these are known as slot receivers.
• Of the 7 (or more) players on the line of scrimmage, all except those at either end of the line are ineligible receivers: these players may not touch or catch a forward pass (unless it is first touched by an eligible receiver, including a deflection by a defensive player), and on a forward pass play, they may not advance downfield (i.e., across the neutral zone) before the pass crosses the neutral zone. Ineligible receivers may advance freely on a running play or after a pass is thrown. These players typically have uniform numbers in the range 50-79 to indicate they are ineligible.
• In the NFL, players with numbers (50-79) indicating ineligibility, and who are not among the ineligible receivers, must report to the referee as eligible; failure to do so will result in a penalty to the offense. The referee will relay that information to the defensive captain, and he will generally announce it to spectators as well. After reporting as eligible, those players may line up at any legal position just as if they were normally eligible receivers. Offenses sometimes use this tactic in a short yardage situation to provide extra blocking, and some plays are even designed for a designated player to receive a pass.
• In high school (NFHS) numbers 50-79 are always ineligibile, and may not receive. In fact if one of these players touch a forward pass before it is touched by a defensive player, it is a penalty for offensive pass interference (15 yards plus loss of down). The numbers can only be eligible during a scrimmage kick (punt or field goal).
• The offense must set before the play: all players must take their positions and remain motionless for at least 1 second before the ball is snapped. Typically, after the offense breaks the huddle and walks to the line, the quarterback will call "set" and then begin his regular snap count. The offense is allowed to shift in certain situations and reorganize, but they must again set once they assume new positions. Once set, offensive players may not move until the snap and may not flinch to simulate a snap (with the exception of the man in motion, described below). A violation is a false start penalty.
• The offense may put one of the 4 backfield players in motion after the set but before the snap. The motion must be either parallel to or (if in the backfield) away from the line of scrimmage at the snap; certain types of football such as arena football allow forward motion at the snap. In Canadian football, all of the players in the backfield can be in motion, in any direction, at the time of the snap, as long as they have not crossed the line of scrimmage before the snap.

List of Offensive formations

T formation

The T-formation, one of the most basic formations in football

Main article: T formation

The T formation is the precursor to most modern formations, in that it places the quarterback directly under center (in contrast to its main competitor of its day, the single wing, which had the quarterback receiving the ball on the fly).

It consists of three running backs lined up in a row about five yards behind the quarterback, forming the shape of a T. It may feature two tight ends (known as the Power T) or one tight end and a wide receiver (in this case known as a split end). The latter variation is known as the Split T, created in 1941 by University of Missouri head coach Don Faurot. This is a running formation in which the option is effective. The T formation was made famous by the University of Minnesota in the 1930s and 1940s (winning five national titles). When the Chicago Bears used the T-formation to defeat the Washington Redskins by a score of 73–0 in the 1940 NFL championship game, it marked the end of the Single Wing at nearly all levels of play, as teams, almost overnight, moved to formations with the quarterback "under center" like the T.

One variation of the T-Formation would be where all the runningbacks would be closer than usual, being at fullback depth rather than halfback depth. Another variation of the "balanced T" formation is the so-called "unbalanced T" formation . In this configuration the line of scrimmage has an end and tackle left of center, while to the right of the center are two guards a tackle and an end. This creates a line that is weighted toward the right of the center. With the backfield lining up in the conventional "T" formation behind the center (quarterback, two halfbacks and fullback), the resulting configuration is "unbalanced" due the asymmetry of the placement of the linemen.

I formation

Main article: I formation

Basic I formation.

This is one of the most common formations used at all levels of football. It consists of two backs lined up behind the quarterback, with the back closest to the quarterback being called the fullback and the back behind the fullback called the running back, tailback, or I-back. The two backs line up either in a line (hence the name of the formation since it looks like a letter I) or with the fullback "offset" to either side. The fourth back is most commonly employed as an extra wide receiver. Here are three diagrams of I-Formation, strong side right (that is, with the tight end lining up to the right, typical for a right-handed quarterback). Notice that the 4th back required by the rules is the set-back wide receiver at the right (called the flanker).

I formation, fullback offset strongside

I Formation, fullback offset weakside

Two other I formation variations include the Maryland I and the Power I. These formations lack a flanker, and use the maximum 3 running backs rather than the standard 2. They are used primarily as running formations. These may employ either tight ends or split ends (wide receivers) or one of each. The Maryland I was developed by Maryland head coach Tom Nugent. More recently, Utah has utilized this formation with quarterback Brian Johnson.

Maryland I

Power I

Ace

Main article: Ace formation

Also known as "single back" formation. Consists of 1 running back lined up about five yards behind the quarterback. The other 2 backs can either act as extra tight ends or wide receivers. This formation is normally used for a pass play, but can also be good for running, as defenders must move at least one player out of the middle of the field (the "box", between the tackles on the offensive line) to cover the additional wide receiver. In passing situations, this formation (and similar variations) is known as max protect as it requires the running back and two tight ends to stay in the vicinity to block an oncoming pass rush and leaves only two wide receivers to catch a pass downfield.

Typical Single-back formation

Here is the basic single-back set. Notice the absence of a fullback and the addition of the extra flanker. Since he is lined up in the space between the tackle and the split end, he is called the "slot" receiver. This formation may be referred to as "single back, slot left."

A variation of the ace is known as the spread formation. It utilizes 4 wide receivers and no tight ends. In the NFL, this formation was the basis of the Run & Shoot offense that was popular in the 1980s with teams such as the Detroit Lions and the Houston Oilers but has since fallen out of favor as a primary offensive formation.

Spread formation

It is often used as a pass formation, because of the extra wide receivers. It also makes an effective run formation, because it "spreads the field" and forces the defense to respect the pass, thus taking players out of the box. Certain college programs, such as the University of Hawaii and Texas Tech still use it as their primary formation. Brigham Young University also uses the spread offense, although they tend to employ their tight ends more frequently than the University of Hawaii and Texas Tech. Minnesota and TCU are also starting to employ the spread offense.

Joe Gibbs's "H-Back" set

Joe Gibbs, twice head coach of the Washington Redskins, devised an ace variation that used a setback, or "flexed" tight end known as an H-back. In this formation, the normal tight-end is almost exclusively a blocker, while the H-back is primarily a pass receiver. This formation is often referred to as a "Two Tight End" set. Some teams (like the Indianapolis Colts under Tony Dungy) use this formation with both tight ends on the line and use two flankers. Many other teams in the NFL, even those that don't use this as a primary formation, still run some plays using a variant of this formation.

Pro set

Main article: Pro set

Basic split backs set

Also called the "split backs" or "three-end formation", this is similar to the I-formation and has the same variations. The difference is that the two backs are split behind the quarterback instead of being lined up behind him.

Clark Shaughnessy designed the formation from the T Formation in 1949 after acquiring halfback Elroy "Crazy Legs" Hirsch. Shaughnessy thought he would make a great receiver but already had two great receivers in Tom Fears and Bob Shaw. Schaughnessy moved Hirsch to the flanker position behind the right end. Thus started what was known as the three-end formation.

This formation is most often associated with Bill Walsh's San Francisco 49ers teams of the 1980s and his West Coast Offense. It also the favored formation of the pass-happy BYU Cougars under the tenure of legendary coach LaVell Edwards. A modern example of the "pro-set" can be seen in the Florida State University Seminoles offense, which favors a Split Backs formation. The Seattle Seahawks also favor this type of formation with the tight end usually being replaced with a third wide receiver

Single wing

Main article: Single-wing

This archaic formation was popular for most of the first 50 years of modern American football, but it is rare today, except as a novelty. There are many variations of the single wing with really the only common thread being that, rather than lining up "under center", the quarterback is lined up a few yards behind with RBs on either side of him (similar to a modern shotgun formation).

Typical Single Wing set. Note the unbalanced line. "C" will snap the ball, even though he is not strictly in the center. This diagram uses the modern terms. In the original single wing, the QB was called the "tailback" and the FB was called the "quarterback" or "blocking back"

The most famous version of the Single Wing offense would be Knute Rockne's "Notre Dame Box" that he ran with the Four Horsemen. It contained two tight ends, and 4 backs. The quarterback in this formation (called at the time a "single-wing tailback"), like today's shotgun QB, received the snap on the fly. The other 3 backs lined up on the same side of the QB in various arrangements. Also, the formation often featured an unbalanced line where the center (that is, the player who snapped the ball) was not strictly in the center of the line, but close to the weakside. The formation was originally designed as a brute-force running formation, since it had 6 players to one side of the center and only 3 on the other. Rockne's innovations with this formation involved using complicated backfield shifts and motion to confuse defenses, and adapting it as a passing formation. The single wing has recently had a renaissance of sorts with high schools; since it is so rare, its sheer novelty can make it successful.

Wildcat formation

Main article: Wildcat formation

Early in the 2008 season, the Miami Dolphins used a modern variant of the single wing formation known as the Wildcat formation. During the latter part of the 2008 season, and throughout the 2009 season, many different NFL teams have instituted their own versions of the Wildcat. The Wildcat had been developed a decade earlier at Kansas State University (whose sports teams are known as the "Wildcats"), and had seen variations around the NCAA for various teams, most notably the "Wildhog" version used by the University of Arkansas for their versitile running back Darren McFadden.

Double wing

The double wing, a variant of the single wing, was invented by Pop Warner in 1912. The offense is primarily a running offense using misdirection and power plays. Most double-wing plays use a motioning wing back at the start of each play.

A version known as the "wildcat offense" uses the same plays as the double-wing offense except that it uses a direct snap to either back and allows for more passing. In this formation, the quarterback from the offensive team is generally lined up in a wide receiver position, which allows for additional flexibility; for example, an end-around might be run with the QB receiving the ball, leaving him in a good position for a downfield pass.

The Double Wing is often incorrectly referred to as the Wing T, which is a different formation that uses a different formation of the backs. The Double Wing is used mostly at a high school level, although some colleges run a similar offense out of the flexbone, but usually focus more on option runs. The Double Wing usually puts a wing back in motion at the beginning of the play, and the defense can sometimes pick up on this and use that to know where the play is going, so the Double Wing uses counters where the back that doesn't go in motion gets the ball. Also, the double wing can be set into different formations, such as the Maryland I, to take away the pre-snap key on the wing back, yet still run all the plays effectively.

Shotgun

Main article: Shotgun formation

Typical Shotgun formation

The modern descendant of the Single Wing. The quarterback lines up about five yards behind the center, in order to allow a better view of the defense and more time to get a pass off. The shotgun can distribute its 3 other backs and 2 ends any number of ways, but most commonly employs one running back, lined up next to the QB, one tight end and three wide receivers. This formation is most commonly used for passing but the quarterback can also hand it off to a running back or run himself. Some teams use this as their primary formation, such as the New England Patriots, Indianapolis Colts, the University of Hawaii, the Florida Gators and Purdue University. Most commonly, however, the Shotgun is used in long yardage situations, when the team is playing catch-up or in other obvious passing situations. Historically, the Shotgun was used to great success as a primary formation in the NFL by the Tom Landry-led Dallas Cowboys teams of the 1970s and the 1990s Buffalo Bills teams under Marv Levy, who used a variation known as the K-gun that relied on then-Bills quarterback Jim Kelly. Today, the shotgun offense has become a staple of many college football teams. The success has altered the way college coaches recruit players.

Shotgun, Trips left (3 wide receivers on the same side)

Shotgun, Max Protect (Full back in to provide additional protection to quarterback)

Pistol

Main article: Pistol Offense

Chris Ault's "Pistol" formation

This offense was originated by Chris Ault of The University of Nevada Wolf Pack. It is essentially a shotgun variation, with the quarterback lined up closer than in standard shotgun (normally 3 to 4 yards behind center), and a running back lined up behind, rather than next to, the QB (normally at 3 to 4 yards behind quarterback).

The Pistol formation adds the dimension of a running game with the halfback being in a singleback position. This has disrupted the timing of some defenses with the way the quarterback hands the ball off to the halfback. This also allows the smaller halfbacks to hide behind the offensive line, causing opposing linebackers and pass-rushing defensive linemen to play more conservatively. The Pistol can also feature the option play. With this offense, the quarterback has the ability to get a better look past the offensive line and at the defense. Pistol formations have gained some popularity in NCAA football, and in fact a variant of this offense was used by the 2007 BCS National Champs, LSU.

In 2008, the Kansas City Chiefs began using the Pistol prominently in their offense, and are the first NFL team to do so.

Wishbone

Main article: Wishbone formation

The Wishbone formation

A variation of the T-formation invented at the University of Texas at Austin by Emory Bellard, then offensive coordinator under Darrell Royal. It consists of three running backs: a fullback lined up directly behind the quarterback, and the two halfbacks split behind the fullback. It can be run with two tight ends, one tight end and one wide receiver, or two wide receivers. It is used as a running formation for the most part. The option style of offense (where the Quarterback decides to run, handoff, or pitch the ball after the snap rather than before) is most closely associated with this formation. Notable college teams to run the Wishbone include Darrell Royal's Texas Longhorns of the 1960s, Alabama of the early 1970s, and Oklahoma of the late 1970s and early 1980s. As with any hugely successful formation or philosophy, as teams learned how to defend against it, it became much less successful. By 1990, few major programs were using the wishbone anymore.

Flexbone

Main article: Flexbone formation

The base flexbone formation.

A common formation found in colleges and high schools. In this formation, one back (the fullback) lines up behind the quarterback. Both ends are often split wide as wide receivers, though some variations include one or two tight ends. The two remaining backs, called wingbacks or slotbacks, line up behind the line of scrimmage just outside the tackles. This formation is primarily used to run the option, especially the triple option. Often, one of the wingbacks will go in motion in the direction the play is being run in. The United States Air Force Academy, the United States Naval Academy and Georgia Tech are three college football teams that use this formation. This formation was first used by University of Texas coach Darrel Royal in the '60s and '70s. Fake it to the fullback and then option it to one of the running backs.

Wing T

The Delaware Wing T, as developed by David Nelson. In this case, one of the half backs starts in the back field. The other (the wing back) almost always goes in motion towards the QB at the snap

A formation similar to the Flexbone, though much older, is known as the "Delaware Wing-T" was created by longtime University of Delaware coach and NCAA Rules Committee chairman David Nelson, and perfected by his successor Tubby Raymond. It has become a very popular offense with high schools and small colleges. It was designed at the time to be a mix between the single wing and T-formation. It took the motion and run-strength of the single wing, and the QB-under-center from the T. In this variation, there is only one wing back, with the other back lined up next to the fullback on the opposite side from the wing back. However, the Wing Back may also line up diagonally from the Tight End. He may be used as an extra blocker or a receiver. He may come in motion for running plays.

Empty backfield

Empty backfield, trips left, slot right

Also known simply as "Five-wide", a reference to the five wide receivers. In the empty backfield formation, all of the backs play near the line of scrimmage to act as extra wide receivers or tight ends. This is almost exclusively a passing formation used to spread the field, often to open up short inside routes or screen routes. It can also be run with one or two wing backs like the flexbone formation allowing a running game and the ability to run the option. The quarterback can line up either under center or in the shotgun. This formation is becoming more popular in the NFL and college football, with recent successes at Texas Tech University and by the New England Patriots in their 3 Super Bowl winning seasons.

Goal line formation

Also called "jumbo", "heavy", "full house" or other similar names. As the name implies, this formation is used exclusively in short-yardage situations, and especially near the goal line. This formation typically has no wide receivers, and often employs 3 tight ends and 2 running backs, or alternately 2 tight ends and 3 running backs. Often, a tight end or full back position is occupied by a player who normally plays offensive line or defensive line positions to act as extra blockers. The Chicago Bears of the mid 1980's famously used defensive tackle William "The Refrigerator" Perry as a full back in this formation. In most cases, it is exclusively a running formation, designed to score by brute force. Some teams have successfully used this formation to pass out of, most famously the New England Patriots, who have used linebacker Mike Vrabel as a tight end to catch touchdown passes in both Super Bowl XXXVIII and Super Bowl XXXIX

A-11 / Emory and Henry

Main article: A-11 offense

The Emory and Henry offense dates to the 1950s (named after Emory and Henry College) and features an unconventional arrangement of the offensive line. Instead of aligning all five of the ineligible receivers together to form an "interior line," only three core linemen (the center and two guards) lined up around the ball, while the two tackles split off to join the a split end and a slotback/flanker (two wide receivers) on each lateral side of the field.

The same formation was used as part of the basis for the A-11 offense, invented in September 2007 by Kurt Bryan and Steve Humphries at Piedmont High School in California. The offense exploited a loophole in the high school football rule books by running from what is technically considered a "scrimmage kick;" two quarterbacks are positioned seven yards behind the line of scrimmage, while the other nine players (wearing numbers that make them appear to be eligible receivers) in "Emory & Henry" or similar formations. While only four of the receivers are eligible during any given play, the formation allows the eligible and ineligible receivers to be interchanged frequently and makes it difficult to discern between eligible and ineligible receivers.

These systems have been adapted for many years as gimmicks for punt teams, as well as for struggling offenses who have an abundance of skill position players but lacked linemen. The A-11 received a great deal of media attention from the likes of American Football Monthly, ESPN, Sports Illustrated, Salon.com and others, but it was never legal at the NCAA and NFL levels. In February 2009, the loophole allowing the A-11 as an every-down offense was formally closed by the National High School Football Federation, forcing significant changes to the offense. The current version, more akin to the original Emory & Henry formation, is legal in most, if not all, leagues.

The Defense

Two terms often heard in referring to defensive formations are "the box" and "the secondary". The box is defined as an area on the defensive side of the ball, within 5 yards of the line of scrimmage and framed by the offensive tackles. This area is most commonly occupied by defensive linemen and linebackers. The secondary can refer to the defensive backs as a group, or to the area behind the linebackers usually occupied by defensive backs. The two standard NFL defenses, the 4-3 and the 3-4, have 7 players in the box; sometimes the phrase "8 in the box" will be used to indicate that one of the safeties has moved into the box to defend against the run.

Defensive Positions

The three basic defensive positions are:

• Defensive lineman (DL): Linemen play at the line of scrimmage, directly across from the offensive line. They are categorized as defensive tackles (DT) or defensive ends (DE). 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.

• Linebacker (LB): Linebackers are positioned 2 to 4 yards behind the defensive line. The 4-3 defense has 3 linebackers, who are categorized as strong, middle and weak (SLB, MLB, WLB; also called Sam, Mike and Will). This is not an indication of strength; it instead refers to the positioning of the linebackers relative to the offense. Strong linebackers line up on the same side as the tight end, weakside away from the tight end. A 3-4 defense will use 4 linebackers, who are indicated by their side (right/left) and positioning (inside/outside).

• Defensive back (DB): Defensive backs can include cornerbacks (CB), a strong safety (SS, lines up on same side as tight end) and a free safety (FS, so called because they are "free" to roam where needed). Cornerbacks are almost always responsible for defending receivers against the pass. Safeties often defend receivers as well, but they are usually positioned in the center of the field to be prepared to stop the run as well.

Rules

Rules regarding defensive formations are not as complex as their offensive counterparts. The defense may line up anywhere on its side of the neutral zone, and players are free to move at any time before the snap, but all defensive players must remain on their side of the neutral zone (defined as the width of the ball) before the snap. If they line up on the wrong side of the line, the offending player(s) are offsides.

A defensive formation with the "box" highlighted.

These formations assume the offense is lined up strong side right (from the offenses point of view). These diagrams could be matched up to the diagrams above to make a complete 22 player football field.

List of Defensive formations

4-3

This is the base defense for most teams. It consists of four defensive linemen, three linebackers, and four defensive backs (two safeties, two corners). Against two-receiver offensive sets, this formation is effective against the run and the pass. In the 4-3, the linemen tend to line up in the gaps between the offensive line. On passing downs, the Mike (middle linebacker) is often responsible to cover any running backs, the Sam (strong-side linebacker) covers the Tight End, and the Will (weak-side linebacker) either covers a back or "blitzes" in an attempt to "sack" the quarterback. This formation was invented by former Dallas Cowboys Head Coach Tom Landry while he was the defensive coordinator of the New York Giants.

Basic 4-3

4-3 over (linebackers shifted to strong-side)

4-3 under (linebackers shifted to weak-side)

6-1

The 6-1 defense basically has the personnel of the 4-3 defense, but instead of the outside linebackers playing behind the defensive line, they line up alongside of the defensive line. The middle linebacker is the only one directly behind the line.

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. This formation sacrifices some size (of linemen) for speed (of linebackers), but coaches choosing to utilize this formation as their base defense typically choose larger players in the front 7 to make up for the shortage of size. In this formation, the single tackle usually lines up directly over the "nose" of the ball, and is often called the "nose tackle". In this formation, the linemen often line up directly in front of the offensive line, while the linebackers "shoot the gaps".

Basic 3-4

2-5

In this variation of the 3-4, known also as the "3-4 eagle", the nose tackle is removed from play and in his place is an extra linebacker, which lines up on the line where the nose tackle would be, sometimes slightly behind where the nose tackle would be. It allows defenses more flexibility in man to man coverages and zone blitzes. It was created by Los Angeles Rams defensive coordinate Fritz Shurmur, and evolved from Buddy Ryan's 46 defense. Shurmur created the defense in part to take advantage of the pass rush abilities of Kevin Greene, a defensive end sized linebacker. The "eagle" in the formation's name comes from the late 1940s-early 1950s Philadelphia Eagles coached by Greasy Neale. (The original Eagle defense was 5-2 arrangement, with five defensive linemen and two linebackers. In Neale's defense, as in Shurmur's variation, the nose tackle could also drop into pass coverage, thus Shurmur's use of the Eagle defense name.)

4-4

Consists of four defensive linemen, four linebackers, and three defensive backs (one safety, two corners). Puts "eight men in the box" to stop the run, but it sacrifices deep coverage against the pass, especially if the opponent's receivers are better athletes than the cornerbacks. The formation is popular in high school football as well as smaller collegiate teams. If the opposite team is a good passing team, outside linebackers are usually called on to defend slotbacks.

46 (forty-six)

Main article: 46 defense

This formation was invented by Buddy Ryan, defensive coordinator of the Chicago Bears during the 1980s. Instead of having four linemen and six linebackers as the name may suggest), it's actually a 4-4 set using 4-3 personnel. This was accomplished by moving a safety up into the "box" instead of a fourth linebacker. The '46' refers not to any lineman/linebacker orientation but was the jersey number of Doug Plank, the player Buddy Ryan first used in this role at Chicago. The other feature of the 46 was the placement of both "outside" linebackers on the same side of the formation, with the defensive line shifted the opposite way. This defense was the philosophical equivalent of the "Notre Dame Box" offense devised by Knute Rockne in the 1930s, in that it used an unbalanced field and complex pre-snap motion to confuse the opposing offense. Chicago rode this defense into a 15-1 season in 1985, culminating in a 46-10 win over New England in Super Bowl XX.

The 46. Notice the strong safety in the box and the 2 outside linebackers shifted to the same side outside of the defensive end

5-2

Consists of five defensive linemen, two linebackers, and four defensive backs (two corners, two safeties). Used to stop the run without sacrificing a safety. This formation is common in high schools..

The 5-2. If the defensive ends drop into pass coverage, this formation becomes functionally equivalent to a 4-3

Nickel formation

While the original Nickel defense utilized 5 defensive backs in conjunction with a 4 man rush, and but 2 linebackers, modern definition calls any formation that utilizes 5 defensive backs (from nickel = 5 cent piece) a Nickel defense. The Nickel defense originated as an innovation of Philadelphia Eagles defensive coach Jerry Williams in 1960 as a measure to defend star tight end Mike Ditka of the Chicago Bears. The Nickel defense was later plagiarized by then Chicago Bear's assistant George Allen who came up with the name "nickel" and later marketed the idea as his own . The Nickel coverage scheme is often used when the offense is using an additional wide-receiver as it matches an extra Corner back against the extra receiver. The extra Corner is often called a nickelback. Some variations use an extra Strong Safety instead of an extra Corner. Strong Safeties are often the more physical of the Safeties, often resembling Linebackers, so a Nickel with the extra Safety can be more effective against the run than one with an extra Corner. The Nickel formation comes in several varieties:

The 4-2-5 removes a linebacker from the standard 4-3 to get the extra defensive back. A variation is the 2-4-5 which is primarily run by teams that run the 3-4 defense. They replace a defensive tackle with a corner.

The 3-3-5 removes a lineman to get the nickelback.

The 33 stack uses an extra strong safety, and "stacks" linebackers and safetys directly behind the defensive linemen.

The 3-5-3 refers to a defense that has three down linemen (the "3" level), three linebackers and two corners (the "5" level), one free safety and 2 strong safeties (the "3"level). This is similar to a 33 stack, but with players more spread. Also called the "umbrella" defense or "3-deep." In this set, the third safety would be referred to as a "weak safety" (WS) and allows two position safeties at the mid-level with a third safety deep. It is because of this that the secondary safety in a football defense is called a free safety rather than a weak safety

Dime formation

Any defense consisting of six defensive backs. The sixth defensive back is known as the dimeback and this defense is also used in passing situations (particularly when the offense is using four wide receivers). As the extra defensive back in the nickel formation is called the nickel, two nickels gives you a dime, hence the name of the formation.

A 4-1-6 (typical dime set-up)

Quarter and half-dollar formations (prevent defense)

See also American football strategy#Prevent

Any defense consisting of seven (quarter) or eight (half dollar) defensive backs. The seventh defensive back is often an extra safety, and this defense is used in extreme passing situations (such as to defend against a Hail Mary pass). It is occasionally referred to as the prevent defense because of its use in preventing desperation plays. The cornerbacks and safeties in a prevent defense usually make a point in a prevent defense of defending the goal line at the expense of receivers in the middle of the field, thus making the formation susceptible to running plays and short passes.

The quarter formations are run from a 3-1-7 or a 4-0-7 in most instances; the New England Patriots have used an 0-4-7 in some instances with no down linemen. Half dollar defenses are almost always run from a 3-0-8 formation. The eighth defensive back in this case is usually a wide receiver from the offense; this is usually because the offensive players would be better than the defensive roster depth at that point, and the wide receiver's pass catching skills would come in handy in some situation.

Unlike other formations, the extra safety is NOT referred to as a quarterback or halfback, for obvious reasons, but rather simply as a defensive back or a safety.

3-deep quarter formation (3-1-7), the most common

Bill Belichick, head coach of the New England Patriots, has used this unusual variation "Quarter" formation with no linemen (essentially a 0-4-7)

Goal line defense

Defense used on the goal line or in short yardage situations where the entire defense lines up close to the line of scrimmage in an attempt to stop an expected running play. It is usually used to counter a Goal Line offense. Since there is not more than 10-11 yards of field left, the safeties can be pulled for more linemen or linebackers.

However, depending upon the abilities of a particular receiving corps, some defenses may be forced to keep their defensive backs in goal-line situations, weakening their ability to stop the run.

A goal-line defense with "9 in the box"

Other variants

Clearly, the permutations are endless, bound only by the individual and collective abilities of a defensive unit. More extreme formations may be called for when a coach feels that his team is at a particular disadvantage due to personnel matchups. For example, Eric Mangini, currently coaching the Cleveland Browns and the former coach of the New York Jets, has employed an interesting scheme that involves 1 defensive lineman and 6 linebackers serving as the front seven. Prior to the snap, only the lineman assumes a three-point stance, ready to rush the passer. The 6 linebackers, meanwhile, "rove" up and down the line of scrimmage, attempting to confuse the quarterback as to whether they will rush, drop into coverage, or even bring the blitz. This defense, combined with poor weather conditions, did serve to improve the Jets' pass rush against a normally reliable New England Patriots offensive line, limiting Patriots' quarterback Tom Brady to just 14/27 passing, with 0 TDs and 1 INT, during a December 16, 2007 contest, but proved ineffective in stopping the Patriots' running attack as the Patriots won their fourteenth consecutive game.

Special teams formations

Punting Formation

Diagram of a punt formation (blue, at top), against a punt-block formation (red, at bottom).

Punting formations use a five-man offensive line, three "upbacks" (sometimes also referred to as "personal protectors") approximately 3 yards behind the line to act as an additional line of defense, two wide receivers known as "gunners" either to stop the punt returner or to down the ball and the punter, 15 yards behind the line of scrimmage to receive the long snap. The number of upbacks and gunners can vary, and either position can be replaced by a tight end in a "max protect" situation.

|                    |[][][][][]    [][][][][]
|      FS            |             PK
|   LB    LB    LB   |-----------()-----------
|CB   DEDTNTDTDE   CB| []   []   []   []   []
|---------()---------| []                  []
|   TELTLGLSRGRTTE   |   []              []
| UB              UB |      KR        KR
|           PH       |
|                    |
|       PK           |

Above: ASCII art representations of the offensive kick (bottom left) against a generic kick defense formation (top left) Note the extremely tight spacing of the linemen. Top right: Kickoff formation, bottom right: kick return formation.

Field Goal Formation

Most field goals feature nine offensive linemen (seven on the line, both ends in the tight end position, with two extra slightly off the line of scrimmage), a place holder who kneels 7 yards behind the line of scrimmage, and a kicker.

Kickoff Formation

Kickoff formations are usually in a straight line, with ten players (nine if a placeholder is used on the kickoff) lined up across the field several yards behind the ball. Many leagues require that at least four players be on each side of the kicker at the time of a kick; prior to this, an onside kick formation often had all ten of the other players on one side of the kicker.

Kick return Formation

Kick return formations vary; in most situations, an association football-like formation is used, with eleven players staggered throughout the field including two (rarely, one) kick returners back to field deep kicks, two more twenty yards ahead of them to field squib kicks, two more at about midfield mainly to assist in blocking, and five players located the minimum ten yards from the kicking line. In obvious onside kick formations, more players are moved to the front of the formation, usually top wide receivers and other players who are good at recovering and catching loose balls; this formation is known as the "hands team." A kick returner will usually remain back in the event of an unexpected deep kick in this situation.

To defend punts, the defensive line usually uses a man-on-man system with seven defensive linemen, two cornerbacks, a linebacker and a kick returner. They may choose to attempt to block the punt, or drop back to block the receiver.

The "kneel" formation was developed in 1978 after The Miracle at the Meadowlands.

Kneel

A special formation is used at the end of a game, when a team has a lead and simply needs to run out the clock to win the game. The "kneel" or "victory" formation was developed in the 1978 NFL season after The Miracle at the Meadowlands, a botched final play in a game between the New York Giants and the Philadelphia Eagles which resulted in a fumble and a pivotal last-second score. This formation is intended for one purpose: to allow the quarterback to safely down the ball without losing control, preventing the defense from recovering and advancing the ball to the end zone. The formation features several stop-gaps in the event the quarterback does lose the ball: a seven-man line, the quarterback, two upbacks (running backs) immediately behind him, one at each side in the event he fumbles, and a fast player (usually a wide receiver or cornerback) several yards back as a last resort in case the defense recovers and is able to advance the ball.

Both the Giants and Eagles developed similar formations of this design. The Eagles named their version the "Herman Edwards" play after their cornerback who scored the winning touchdown on the above fateful play.

See also

• American football strategy

External links

• Diagrams of NFL offensive and defensive formations
• Article on the history of the Split T formation
• Story on the invention of the Wishbone