American football strategy

American Football involves a great deal of strategy and execution. There are many different alignments and plays that can be run in many different situations. For example, there are kickoffs, field goals, and punts which all require different alignments, as well as standard offensive and defensive alignments that vary widely.

Offensive alignments

See American football for a description of positions used

There are literally hundreds of offensive alignments that are commonly used in the game of football, although most are slight variations on a theme, or a set of personnel. All offensive formations use 5 offensive linemen who are not allowed to handle the ball, and 6 "skill" position players who are allowed to handle the ball. Exactly 7 players must always be on the line of scrimmage when the play begins. This article will organize offensive alignments by the personnel that are on the field, and assumes that a quarterback is used in every formation.

2 Running back, 2 Wide Receiver, 1 Tight end

I-formation

One of the most basic offensive alignments is the I formation. The quarterback aligns directly behind the center, the fullback several yards behind the quarterback, and the halfback several yards behind the fullback. The tight end aligns directly next to the furthest offensive lineman, usually on the right side, and 2 wide receivers are split several yards to the outside of the offensive line.

This formation is a fairly balanced alignment. It slightly favors a power running game, as the offensive line, fullback, and tight end are able to block opposing defensive players, it is versatile enough to allow runs to many different areas of the middle of the field, as well as off-tackle and even some sweep and pitch plays. The I-formation is also fairly good for passing plays, especially using play-action, where the offense fakes a running play before passing.

There are several possible variations of the I formation. The fullback may align slightly to the left or right, usually called a weak or strong I respectively. Also, both wide receivers can line up on the same side, rather than different sides.

Split-backs

In a split back formation, the running backs are behind the quarterback and each is split to one side. The tight end lines up next to an offensive tackle, usually on the right side, and the wide receivers are aligned to the outside. The quarterback takes the snap directly under center.

The split back formation is more of a finesse formation. It allows off-tackle runs, sweeps, and pitches, and gives the running backs more space to act as receivers. It is possible to run up the middle, but less effective because the fullback is not stacked in front of the halfback as in the I, making it difficult for him to act as a lead blocker. Many running plays use "trap-blocking" whereby an offensive lineman moves to the outside to act as a lead blocker, while the fullback blocks a defensive lineman in the area he came from. The formation is usually quite effective for passing, as the wide receivers, tight end and possible one running back can act as receivers, while one running back stays back to protect the quarterback.