Image : http://www.flickr.com
Offensive formations
Before the ball is snapped the offensive team lines up in a formation. Most teams have a "base" formation they prefer to line up in, while other teams leave the defense guessing. Teams will often have "special formations" which they only use in obvious passing situations, short yardage or goaline situations, or formations they have developed for that particular game just to confuse the defense. Because there are a nearly unlimited number of possible formations, only a few of the more common ones are listed below.
Pro Set
The Pro Set is a traditional formation commonly, a "base" set used by professional and amateur teams. The formation has two wide receivers, one tight end, and two running backs with the backs split behind the quarterback, who is lined up behind center. The running backs are lined up side-by-side instead of one in front of the other as in traditional I-Formation sets.
Shotgun formation
The Shotgun formation is an alignment used by the offensive team in American and Canadian football. This formation is used by many teams in obvious passing situations, although other teams do use this as their base formation. In the shotgun, instead of the quarterback receiving the snap from center at the line of scrimmage, he stands at least 5 yards back. Sometimes the quarterback will have a back on one or both sides before the snap, while other times he will be the lone player in the backfield with everyone spread out as receivers. One of the advantages of the shotgun formation are that the passer has more time to set up in the pocket which gives him a second or two to locate open receivers. Another advantage is that standing further back from the line before the snap gives the quarterback a better "look" at the defensive alignment. The disadvantages are that the defense knows a pass is more than likely coming up (although some running plays can be run effectively from the shotgun) and there is a higher risk of a botched snap than in a simple center/quarterback exchange.
The formation got its name after it was used by a professional football club, the San Francisco 49ers, in 1960. Combining elements of the short punt and spread formations ("spread" in that it had receivers spread widely instead of close to or behind the interior line players), it was said to be like a "shotgun" in spraying receivers around the field like a scatter-shot gun. Formations similar or identical to the shotgun used decades previously would be called names such as "spread double wing". Short punt formations (so called because the distance between the snapper and the ostensible punter is shorter than in long punt formation) don't usually have as much emphasis on wide receivers.
At times the formation has been more common in Canadian football, which allows only three downs to move ten yards downfield instead of the American game's four. Canadian teams are therefore more likely to find themselves with long yardage to make on the penultimate down, and therefore more likely to line up in the shotgun to increase their opportunities for a large gain. Teams such as the Saskatchewan Roughriders utilize the shotgun for a vast majority of their plays.
Wishbone formation
The wishbone formation, also known simply as 'bone, is a play formation in American football.
The wishbone is primarily a running formation with one wide receiver, one tight end and three running backs behind the quarterback (who takes the snap under center). The back lined up behind the quarterback is the fullback and the other two are halfbacks (although they may be called tailbacks or I backs in some playbook terminology).
The wishbone is often associated with the option as this formation allows the quarterback to easily run the option to either side of the line. It is also ideal for running the triple option.
History
The wishbone was developed by Offensive Coordinator Emory Bellard and Head Coach Darrell Royal at the University of Texas in 1968. Coach Royal was always a fan of the option offense, and in looking at the personnel on the team, Coach Bellard saw three great running backs. After experimenting with family members over the summer, Coach Bellard came up with the formation.
Coach Bellard demonstrated the formation to Darrell Royal, who quickly embraced the idea. It proved to be a wise choice: Texas tied its first game running the new offense, lost the second, and then won the next thirty straight games, leading to two National Championships using the formation.
It was given the name wishbone by the Houston Chronicle sportswriter Mickey Herskowitz.
A variation to this formation is called the flexbone.
I formation
The I formation is one of the most common offensive formations in American football. The I formation draws its name from the vertical (as viewed from the opposing endzone) alignment of quarterback, fullback, and running back, particularly when contrasted with the same players' alignments in the now-archaic T formation.
The formation begins with the usual 5 offensive linemen (2 offensive tackles, 2 guards, and a center), the quarterback under center, and two backs in-line behind the quarterback. The base variant adds a tight end to one side of the line and two wide receivers, one at each end of the line.
Typical roles
The I formation is typically employed in running situations. The fullback typically fills a blocking, rather than rushing or receiving, role in the modern game. With the fullback in the backfield as a blocker, runs can be made to either side of the line with his additional blocking support. This is contrasted with the use of tight ends as blockers who, being set up at the end of the line, are able to support runs to one side of the line only. The fullback can also be used as a feint--since the defense can spot him more easily than the running back, they may be drawn in his direction while the running back takes the ball the opposite way.
Despite the emphasis on the running game, the I formation remains an effective base for a passing attack. The formation supports up to three wide receivers and many running backs serve as an additional receiving threat. While the fullback is rarely a pass receiver, he serves as a capable additional pass blocker protecting the quarterback before the pass. The running threat posed by the formation also lends itself to the play-action pass. The flexible nature of the formation also helps prevent defenses from focusing their attention on either the run or pass.
Common variations
Many subtypes of the I formation exist, generally emphasizing the running or passing strengths of the base version.
* The Big I places a tight end on each side of the offensive line (removing a wide receiver). Coupled with the fullback's blocking, this allows two additional blockers for a run in either direction. This is a running-emphasis variant.
* The Power I replaces one wide receiver with a third back (fullback or running back) in the backfield, set up to one side of the fullback. This is a running-emphasis variant.
* The Jumbo or Goal-line formation further extends the Power I or Big I, adding a second or third tight end to the line, respectively. This variant has no wide receivers and is all but exclusively a running formation intended to reliably gain minimal yardage, most commonly two yards or less.
* The Three-wide I replaces the tight end with a third wide receiver. This is a passing-emphasis variant.
The I formation, in any variant, can also be modified as Strong or Weak. In either case, the fullback lines up roughly a yard laterally to his usual position. Strong refers to a move towards the side of the quarterback with more players, weak in the opposite direction. These modifications have little effect on expected play call.
In Professional Football
In the NFL, the I formation is less frequently used than in college, as the use of the fullback as a blocker has given way to formations with additional tight ends and wide receivers, who may be called on to block during running plays. The increasingly common ace formation replaces the fullback with an additional receiver, who lines up along the line of scrimmage. The I will typically be used in short-yardage and goal line situations.
Goal Line formation
Single set Back
Single set back is a base formation in American Football used by the offensive team which requires only one running back behind the quarterback. There are many variations on single back formations including two tight ends and two wide receivers, one tight end/three wide receivers, etc. The running back can line up directly behind the quarterback or offset either the weak side (away from the tight end) or the strong side(towards the tight end).
Friends Link : polk audio systems shirt football polk audio computer speakers Netbooks @ Best magic prices Jeans comment and review
ไม่มีความคิดเห็น:
แสดงความคิดเห็น