Sniffer
also: sniffer alignment · sniffer position
A tight off-ball alignment set roughly one yard behind the offensive line in the guard or tackle gap.
A sniffer lines up off the line of scrimmage, roughly one yard deep in the gap behind an offensive guard or tackle. Aligning off the line gives the blocker a running start and an uninhibited angle to cross the formation, insert into interior gaps, or release into pass routes without colliding with pulling linemen.
Coaches align a sniffer to execute four primary assignments: - Split Zone Sift: Sifting across the formation behind the center to kick out or seal the backside defensive end on zone runs. - Wham Block: Trapping an interior defensive tackle (such as a 3-technique) while the offensive linemen climb directly to linebackers. - Insert Lead (Iso): Darting into the B or C gap ahead of the running back to lead-block an inside linebacker. - Flat Release: Faking an interior block and leaking into the flat on bootlegs and play-action passes.
Sniffer describes the alignment landmark, while H-Back, Y, or Fullback identifies the player's personnel role in the playbook.
sniffer alignmentH-backA note on how the term is used
Sniffer is an alignment tag (like slot or wing), not a personnel group. Offenses can place a backup offensive tackle, a true fullback, or an H-Back in the sniffer alignment depending on whether the call requires heavy run blocking or pass catching.
Where you will hear it
- spread run games
- gap and zone schemes using an off-ball blocker