4-2-5

I've been studying the 4-2-5 and I pulled a lot of good resources from Runcodhit, Brophy, Deuce, Blitzology, Coach Mac, and Chris at SmartFootball.  The newer links are at the top of the list under each coach.  Here are links to the 4-2-5:

Start here:
Multiplicity but Simplicity: Why the 4-2-5 Defense - Gary Patterson - DC - New Mexico (1997)
TCU 4-2-5 - Gary Patterson (Nike COY)

Runcodhit:
Defending Trips - Disguise and Scheme
3x1 Formations- Defending the Open Side
Defending Tight Bunch Formations
Stopping the Power Running Offense with the 4-2-5 Part I: Principals
Stopping the Power Running Offense with the 4-2-5 Part II: Double Tight I
BRACKET COVERAGE: PART I THE BASICS
BRACKET COVERAGE PART II: SLOT BRACKETS
BRACKET COVERAGE PART III: Combination Brackets
DOG BLITZES (TCU vs WISCONSIN)
Split Safety-Zone Blitzes
4-2-5 Alignments-Part I
4-2-5 Alignments-Part II
4-2-5 Resources
Quarter Coverage- Safety Push Technique
Quick Thoughts- Determining Coverages for a Defensive Scheme
Cover Black- Inverted Man-Under Halves
Robber Coverage Notes
Attacking the Away Side : Boise State vs TCU
Random Thoughts
4-2-5 Away Side Run Support
4-2-5 Split Field Coverage

Brophy:
1-High Nickel (4-4) Intro
No-Huddle Check-With-Me Defense
TCU Defense Explained   ***This has TCU Install video
TCU's 42 Nickel Coverage & Front Coordination
TCU's 42 Nickel Blitz & Coverage Concepts
TCU "2 Read": Adaptation to the Spread (2x2)
TCU "2 Read": Adaptation to the Spread (3x1)
Fiesta Bowl: TCU vs Boise State
AFC: Automatic Front Check
Powerpoint Playbooks / Animation
Virginia Tech Robber
TCU's 42 Nickel Coverage & Front Coordination
Brophy's Playbook and Resource Page

Deuce:
TGOG Film
Split Field Concept - The Underneath Players
Setting the Record Straight
Why Install Both Special and Solo Coverages?
Weak Safety Shuffle Technique in Solo Coverage
Two Gap/One Gap vs. One-Back Zone Option
The B.O.S.S. Blitz - An Answer to Dog Blitzing to a 3 x 1 Set
Putting It All Together - Run Fits in the Two Gap/One Gap Scheme
Morphing the 4-2-5 into the 3-3...Keeping the Offense on its Toes...
Automatic Coverage Check (ACC)
TCU Terms - Defined
Cover Blue for Corners - Deuce
Cover Blue for Safeties - Part 1 - Deuce
Cover Blue for Safeties - Part 2 - Deuce
2 Read/Blue Coverage
2 Read/Blue Coverage-The Reads
2 Read/Blue Coverage Revisited
2 Read/Blue Coverage-Run Fits
2 Read/Blue Coverage-Vs. Trips
2 Read/Blue Coverage-Vs. Empty Sets
Post Snap Communication in Pattern Reading Coverages
Simplifying and modifying TCU's blitz scheme for lower level play
Backside Safety in Quarters Coverage vs. The Run and Playaction
The 4-2-5 vs. Flexbone
The down and up stunt vs. the zone read play
The 4-2-5 and the Under, Meshing Two Great Defenses!
The 46 Nickel
Florida's Nickel Tracer/Auburn's Heat Package

Blitzology:
Blitz of the Week #17 (Super Stick)
Making It All Look The Same (TCU Pressure Package)
TCU's Thunder Concept

Coach Mac: (new site)
Concepts to Defend Trips
Defending the Spread with Quarter's Concepts
Building a Defense with the 4-2-5

This site:
4-2-5 vs the Flexbone - Secondary Play
4-2-5 Defense - The Defense of the Future - David Raley (OJW)

Smart Football:
Deconstructing the Virginia Tech defense

Coach Huey thread links:
TCU 4-2-5 Defense
4-2-5 and Under

Playbooks and Other Resources:
1999 TCU Defense / Coverage Manual - Gary Patterson - DC
2006 Baylor Defense - Bill Bradley
2004 Villanova Defense - Joe Trainer
2001 Boise St. Defense - Bob Gregory
2000 Boise St. Defense - Brent Guy
2000 Oregon Defense - Bob Gregory
1992-1997 Williamette Defense - Bob Gregory
8 Man Front - David Bailiff - SW Texas St. (2000)
DL Pressure Games - David Bailiff - SW Texas St. (2001)
Virginia Tech - Cover 2 - Robber Package
1998 Virginia Tech Defense - Bud Foster