Analyze the physics, gap leverage, and expected points added (EPA) of sudden goal-line confrontations. Test defensive plugs versus short-yardage plunges.
In modern NFL analytics, stopping a 4th & Goal inside the 2-yard line represents the single highest win-probability swing non-turnover play in football.
The Los Angeles Chargers deployed a heavy 6-2 front with shaded defensive tackles playing interior half-man leverage, preventing the offensive line from getting hip-to-hip double teams.
In the NFL, a touchdown is scored only when the football itself breaks the plane of the goal line (the forward edge of the white line or the pylons) while in legal player possession. If the ball carrier's knee, shin, or elbow touches the ground before the ball breaks the plane, or if forward progress is definitively ruled halted by the officiating crew, the play results in a turnover on downs at that spot.
The 6-2 front inserts six defensive linemen with their hands in the dirt to cover all six interior gaps (A, B, and C gaps), preventing offensive linemen from climbing to the second level. Two stacked linebackers then have clean sightlines to shoot whichever crease the running back commits to.
Short-yardage football is governed by center-of-mass pad level. The team whose helmets stay lower gets underneath the opponent's breastplate, creating backward horizontal momentum. Even if a running back weighs 230 pounds with 18 mph velocity, an unblocked 245-pound linebacker with downhill leverage can cancel that momentum instantly.