Smash

An outside receiver runs a short hitch while the inside receiver runs a corner route over him — a high-low on the flat defender. Against Cover 2 that defender is the cornerback; against Cover 3 and Cover 4 the stress lands on the apex defender — the nickel or walked-down safety — who has to drive on the hitch or sink under the corner route.

Red zone first; against Cover 2 the cornerback has to choose, and against one-high and quarters the apex is outnumbered by design.