This helped me out a ton:
Originally posted by Havoc
Ok, here are some thoughts on being a DC.
DCing is less time consuming than OCing, because once you have your base defense down, you dont have to change it very much from game to game.
At the start of each season you have to watch a lot of dots to find how Bort's changes have changed which plays are most effective and change your D accordingly. After the 4th or 5th week, you usually have your base defense set and you only need to change things up if an opponent does something unusual- all passing, all running or they run the same exact play over and over again.
The good thing about being a DC is that every opponent selects its plays from the same playbook, which can be seen here: http://seano-glb.bravehost.com/offense.htm
As you can see, if an offense comes out in the weak formation, they can only run 8 plays- 2 runs and 6 passes. The runs are inside left and pitch right. The passes are 3 short, 1 medium and 2 long with 1 of the passes only have 3 possible receivers and another with 5 possible receivers. The other 4 passes have 4 possible receiving options.
In general, I set up my defensive AI based on formation, location on the field and down/distance.
To continue with the anti-Weak formation D AI, I would usually have something like:
Weak Red Zone (More Cover 0, more blitzing)
Weak Short Yardage (Cover 1 and Cover 0, Run focus, run blitzing)
Weak Long Yardage (More Cover 2, more double coverage, pass blitzing)
Weak Normal (Mix of Cover 1 & Cover 2 and a mix of run and pass defenses, moderate blitzing)
One of the most important things about DCing is to always have multiple defenses for every situation. If your defense becomes predictable- for example you always run the same play against a certain formation in a given situation, it's easy as an OC to force exactly the right play to counter your favorite tactic.
The game to game scouting is helpful to determine which individual orders your defenders should have and whether you should modify your base AI to improve your run defense, your pass defense or be prepared for a favorite play by the opposing offense.