Playbooks

Counter F out of Pistol Open Flex is a Power Run scheme that pulls the backside guard and tackle to lead the HB through the point of attack, with the fullback and offensive line executing down blocks to seal the edge and create a misdirection lane. The HB takes a counter step away from the pull before following his blockers, forcing linebackers to flow the wrong way and fill the wrong gap. This is a run play, not a pass concept, so there is no route combo to beat man or zone coverage: the primary read is the HB reading the pulling guard and fullback lead block to decide whether to bend it outside or cut it up inside the counter trap.
Watch for linebacker depth and gap alignment pre-snap. Stacked or crashing linebackers who read run instantly can blow up the counter before the pullers get set. Identify if the defense is in a run-stopping front like a 46 or heavy box look, since Counter F struggles against gap-sound, disciplined front sevens that stay home. Look for edge defenders who squeeze hard and refuse to widen, taking away the cutback lane and forcing the HB into a pile. Post-snap, key the play side linebacker's reaction to the pulling guard. If he stays patient and reads the counter step, he can string the run out for a minimal gain or loss. User-controlled defenders spying the backfield or sitting in the counter trap lane can jump the play immediately, so this concept is riskier against a defender specifically keying run action rather than reacting to the pass fake first.
Run this early in a drive to establish tendencies before mixing in Read Option and HB Zone Wk from the same formation to keep defenders guessing on run fits.
Check the box count pre-snap. If the defense has six or more defenders stacked in the box, counter can get clogged, so be ready to audible to Slants or PA Boot to attack a light secondary instead.
Use play action later off this same look with PA Boot or PA Boot Rt since the counter action sells the same backfield flow and freezes linebackers who bit on Counter F earlier in the game.
On the stick, patiently ride the fullback's lead block and let the pulling linemen clear before accelerating through the hole, since counter runs die when the HB rushes the cut too early.
Best called on early downs (first or second and short to medium) when defenses are more likely to be in base run fits rather than sub packages built to stop the pass.