[KCrockaholic]

I'll give my quick input on it...

Basically a 1 gap 3-4 relies on the d-line to target one hole along the offensive and "shoot the gap". A NT in a 3-4 RARELY lines up straight across from the Center. Usually the NT will line up just off set of the center, putting himself in position to penetrate the 1 hole along the offensive line.

The 2 gap 3-4 teams like Kansas City, need the defensive line to tie up blockers, typically you want the Nose to take up 2 blockers, 1 always being the center obviously, and the "5 technique" defensive end like Tyson Jackson and Glenn Dorsey are asked to tie up the tackles on both sides. This allows for the outside linebackers, and at times the inside linebackers to shoot an open gap, and get free to the backfield and disrupt the QB or HB.

And the term 2-gap represents how many gaps each lineman has to control. Once a play begins the d-line goes head up on an offensive lineman, and they now have the read the play, and control each gap on both sides of them. If a play goes outside, the Nose wants to shed his blocker and fill his gap before the runningback can hit an open hole and reach the 2nd level of the defense.

Hope that helps some people.