Snap (gridiron football)

A snap (also called a "hike", "snapback", or "pass from center") is the backward passing of the ball in gridiron football at the start of play from scrimmage.

The ball begins on the ground with its long axis parallel to the sidelines of the field, its ends marking each team's line of scrimmage in American football; in Canadian football, the line of scrimmage of the team without the ball is 1 yard past their side of the ball. The player snapping the ball (known officially as the "snapper" in rule books) delivers the ball to another player, and that action is the snap. The snapper may hand, throw, or even roll the ball to the other player. The snap must be a quick and continuous movement of the ball by one or both hands of the snapper, and the ball must leave the snapper's hands. The various rules codes have additional requirements, all of which have the effect of requiring the ball to go backward. The snapper almost always passes the ball between his legs, but only in Canadian football is that required.

In the standard gridiron football formation, the center/centre is the snapper and is situated in the middle of the line of scrimmage. Only in arena football is the center required by rule to be the snapper. In other codes, a guard, tackle, running back, tight end or split end can legally deliver the snap; such scenarios, known as an unbalanced line, are seldom used outside of trick plays and novelties.

For a handed snap, the snapper will usually have his head up, facing opponents. For a thrown snap, especially in formations wherein the ball may be snapped to players in different positions, the snapper will commonly bend over looking between his legs. Because of the vulnerability of a player in such a position, the National Collegiate Athletic Association (NCAA) and the National Federation of State High School Associations ("Fed") have adopted rules providing that if a player is positioned at least seven yards behind the neutral zone to receive a snap, opponents are not to deliberately contact the snapper until one second after the snap (NCAA), or until the snapper has a chance to react (Fed). However, in professional football it is common for a center to be able to practice a single "shotgun" formation thrown snap enough to keep his head up and toss it blindly.

A snap is considered a backward pass, therefore if the ball is snapped and it hits the ground without any player gaining control of the ball the play is ruled as a fumble.

The team entitled to snap the ball will usually know in advance the moment when the snap is to occur as one of their players calls out signals, which usually include a loud sound such as "hut" voiced one or more times, the number of which they know; they are thus said to know the "snap count". Therefore, they have a considerable advantage over their opponents. The center is not, however, allowed to make motions simulating part of the snap-action; therefore their opponents can be confident the first motion of the ball or the center's hands is the beginning of the snap.

The snap count is decided on in the huddle, usually expressed as "...on <number>." being the final words spoken by the quarterback after calling the play but before the huddle breaks and the players go to the line of scrimmage. The snap count allows offensive players to have a small head start. The defensive players want to predict the snap, and build up speed such that they cross the line of scrimmage exactly as the play begins, to increase their chances of getting a tackle for a loss or a sack. By varying the snap count, a quarterback forces the defensive players to react to the movement of the offensive players, or risk being called for an offsides or encroachment penalty. Unfortunately for the offense, this advantage can sometimes become a disadvantage. When faced with an exceptionally loud stadium, players may be unable to hear the snap count and are forced to concentrate more on visual cues (silent snap count or a hard count), or risk false start penalties.

The offense must also be mindful of the play clock. If they fail to snap the ball in time they incur a delay of game penalty. Also, with a dwindling play clock, the defense has better chances of guessing when the ball will be snapped. It is easier to predict when the ball will be snapped with 2 seconds left on the play clock, rather than 5 seconds.