How it works
Assignment logic
The runner's initial step suggests a run left while the left guard and tackle pull right. Play-side linemen block down, the guard handles the edge, and the tackle leads through the newly created gap.
Strategic purpose
Use defensive pursuit rules against an aggressive front and create favorable angles at the point of attack.
Gap-scheme coaching
How I Think About Counter
The counter run play is one of my favorite answers to a defense that is playing fast enough to become careless. The offense gives the linebackers and defensive front one picture, lets them start chasing it, and then attacks the space they just abandoned. That is why counter is more than a power run with pulling linemen. It is a misdirection gap-scheme run built to punish pursuit.
I like counter after the defense has seen enough inside zone or outside zone to believe it recognizes the backfield action. If those linebackers are flying downhill on the first step and the defensive ends are squeezing hard, now I can use their confidence against them. Second-and-medium is especially attractive because the offense still has the whole playbook available and the defense cannot sell out for one situation.
What I need from the offense is discipline. The back has to sell the initial step without turning the play into a dance. The pulling guard has to handle the force defender, the wrapping blocker has to get through the gap cleanly, and the down blocks must stop penetration before it wrecks the pullers. Counter works beautifully for teams with athletic guards and tackles, a patient running back, and blockers who understand angles. A line can be physical without being enormous, but it cannot be sloppy.
I am cautious with counter against fronts that are already creating immediate interior penetration. If a defensive tackle is living in the backfield, I do not want to send two blockers laterally behind the line and hope traffic sorts itself out. I also do not love it when the defense is sitting patiently instead of pursuing. Misdirection only has value if somebody believes the first story.
A useful way to think about the matchup is this:
Do not judge counter by whether the hole looks clean at the snap. The whole idea is to move the defense before the real point of attack appears. When it is blocked correctly, the best runs often happen because the defense was technically in the right place for the first picture and completely wrong for the second.