Playbooks
Flanker Spot out of Singleback Doubles South is a classic Spot concept pass play built specifically to attack Cover 3 and other zone shells. The route combo stacks a flat route, a spot (hitch) route, and a corner or dig route on one side to create a natural high low read on the underneath zone defenders, while the backside works as a simple curl flat or man beater option. The primary read progression starts with the flat defender: if he sits, hit the spot route sitting in the hole; if he widens to the flat, throw the corner or dig behind him, with the backside checkdown as your last resort against a hard blitz.
Pre-snap, identify the depth of the strong side linebacker and the flat defender, since Cover 3 sky or buzz variations will shift who has flat responsibility and change your spot route window. Watch for a single high safety with corners playing off at seven or more yards, which signals Cover 3 and tells you the spot route will likely be open in the hook zone. Post-snap, key the flat defender's first two steps: if he widens with the flat route, the throwing lane opens up behind him for the corner or dig route. If you see the defense rolling to a two high shell with corners pressed at the line, expect Cover 2 or man coverage, which can jump the spot route and force you to hot route into man beaters. Watch for a user controlled defender sitting in a lurk position over the middle hook zone, since a smart user will bait the spot throw and jump the route for a pick six if you throw without a full field read.
Use pre-snap motion or a shift to bait the corner into showing man or zone before the snap, since Spot concepts thrive when you can confirm zone coverage.
Look for two deep safeties or a single high safety cheating to the middle of the field, both of which tell you Cover 3 or Cover 1 is likely and that the spot route will have a soft window underneath.
Hot route the backside receiver into a quick out or slant if you are facing aggressive man coverage on the perimeter, since the base Spot concept is built more for zone beating than man beating.
Pair this play with HB Dive or Jet Sweep earlier in a series to get linebackers stepping up on run fits, then come back to Flanker Spot to hit the spot route sitting in the vacated shallow zone.
Best used on second or third and short to medium, where defenses are more likely to sit in zone drops rather than bring pressure, giving your quarterback a clean full field progression read.