In a single-gap defense, the initial thought is to align the defender responsible for a given gap head-up in that particular gap. In theory, this makes it easy for the defender to read his keys and react to the ball aggressively. Offenses play on this alignment rule with zone blocking, particularly the Zone Read. As the ball snaps the offensive line steps in a certain direction, with the understanding that by moving the gap, the defenders will move too. In order for defenses to combat this, the defensive line and linebackers must react off each other (anchor points) and utilize gap exchange. By playing off anchor points (or D-Line gaps), the defense can confuse the offense and stay one step ahead.
Using the Under Front to gain an edge versus Trips.
The 3×1 Dilemma
While working at Baylor, one of the first questions the defensive staff would get from visiting coaches was, “How do you defend Trips?” The Trips formation stresses the defense to the max. By using a 3×1 scheme, offensive coordinators have a plethora of options to attack a defense. If the defense stays in an Over front and tucks the Mike in the strong side “A” gap, the offensive coaches know that the defense is either in man or spinning to single high coverage.
By kicking the boundary safety to the field, the offense gets a guaranteed one-on-one match up with the boundary corner. Even if the defense is dropping an end, or slinging the weak side backer under the single receiver, the top can easily be blown off if the offense has a stud “X” receiver. Against RPO teams a tucked Mike gives offenses the option to read the field safety. This is where the “Spot Draw” can give fits to a defense that is playing an Over front.
Some teams will stay in an Over Front and “sink” the back side safety into the box. This is still the same concept of kicking to the Trips side, but inverted. Though the Mike is now able to cover down for the “snag” route, the defense has introduced a safety into the box, creating a third level conflict player. When teams do this they are exposing themselves to an even bigger play, the backside post shot. By creating a conflicted player in the secondary, the defense has put a CB in isolation. Most modern defenses are trying to find ways to stay in a two-shell to combat one-on-one matchups in the secondary. By sinking, the defense has eliminated a 5-yard route to replace it with a deep shot.
The power run game is not dead. As spread offenses proliferate through all divisions of football, the “Power” play is still a staple of many offenses. Defenses must be able to adapt to any formation without subbing players because of the tempo being thrown at them. This can cause a dilemma when a defense’s base scheme is a 4-2-5. When teams insert an “H”, or fullback, a defense does not have to spin to a single-high in order to gain an extra man in the box. Instead, use the natural structure of the 4-2-5/4-3 Hybrid to the defense’s advantage.