What it is

In gap blocking, also called power blocking, each lineman has a specific defender or gap to block, and often a guard pulls to lead the ball carrier through the hole.

In a game

It creates a defined lane, but it depends on strong blocks and on every assignment being carried out.

More detail

Common gap plays are the power play, with a pulling guard, and the counter, where a guard and a tackle pull from the backside. Because each defender has an assigned blocker, the play depends on a good scheme and a strong push. Gap plays are often used in short yardage.

Animated diagram

1. Each lineman is assigned to block a particular gap or defender, rather than moving as a group in one direction.
2. One lineman, here the left guard, pulls: he steps back and runs behind his teammates toward the other side.
3. He leads the running back through the hole and blocks the defender who would make the tackle.