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Old 01-11-2008, 12:53 PM   #164
Box_O_Rocks
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Quote:
Originally posted by Baron Samedi on 01-11-2008 at 08:43 AM
I would like to know more about "1 gap" and "2 gap" defense. I get the gist of it...I think, but I don't really grasp it or the difference, or how it is played differently on the line.

What do the Patriots normally do?
Let's see if I can spread the workload around a bit here:
Code:
Gap nomenclature
     TE     OT     OG     C     OG     OT     TE
  |      |      |      |     |      |      |       |
  d      c      b      a     a      b      c       d
You have 8 gaps that need to be defended. In a one-gap system, each member of the front seven would be assigned a gap to defend. They defend that gap by penetrating and filling the gap, trying to beat the blocker to the spot.

Now, with the numbers, there's one gap left undefended, at it's most basic that gap belongs to the Safety - think Indy and Bob Sanders. Indy is a one-gap defense, they penetrate off the snap and Sanders reads run/pass so well that he can commit to the line of scrimmage with little to no hesitation on most plays. The RB's job is generally to find the crease that allows him to explode out of the backfield and into the defensive secondary, Sanders would know which gap is undefended from the defensive calls and be expecting the RB to find that gap and meet him there.

In a two gap system the defenders are assigned two gaps. Instead of penetrating the gap to beat the blocker, the defender engages and controls the blocker while reading the backfield to locate the runner when he commits. Think Vince Wilfork: Vince is responsbile for the two "a" gaps. He will attempt to gain control of the C and be free to steer the C so as to allow himself a clear shot at the RB if he comes inside. Vince is supported in this by both ILBs, each of whom overlaps Vince on an "a" gap. In straight one-on-one blocking, the OGs are responsible to block the ILBs, this leaves Vince free to steer the center and make the play.

One gap and two gap do not rely on formation. Dallas and San Diego run 3-4 sets, but they are one gap teams. Indy and Buffalo are one gap 4-3 teams. NE is a two gap 3-4, Philadelpia is a two gap 4-3.

Think about Indy and NE in terms of player size. Indy uses smaller DL (Mathis was only around 225-230 when he came into the league, and Freeney at 260 was considered "light" for a DE. Both men try to beat the blocker with speed and quickness so their size gives them an advantage. Indy's DL are generally under 300 lbs and quick. NE has a 3 Defensive Tackle front, with four Defensive Ends playing Linebacker. Indy's Linebackers are all smaller and faster.

That's my gap control 100 class for you Baron.
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