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Stopping the run is the first commandment of defense in CFB 27. If an opponent can run the ball effectively, they control the clock, stay ahead of the chains, and set up play-action passing that devastates your secondary. Building a run-stopping defense starts with understanding gap assignments and defensive front principles. Gap integrity is the foundation of run defense. Every defensive player has a gap responsibility: the space between offensive linemen where the running back can attack. A-gaps are between the center and guards. B-gaps are between guards and tackles. C-gaps are outside the tackles. When every defender maintains their gap, the running back has nowhere to go. When one defender abandons their gap, the running back finds the hole and exploits it. Visit cfb27.com for gap responsibility diagrams and run defense tutorials. Defensive front selection determines your gap assignments. An even front (four down linemen) typically uses a two-gap system where defensive linemen are responsible for two gaps each. This requires bigger, stronger defensive linemen who can hold their ground against double teams. An odd front (three down linemen) typically uses a one-gap system where each defender attacks a specific gap. This requires quicker, more athletic defensive linemen who can penetrate and disrupt. The 4-3 defense is the standard for stopping the run. Four defensive linemen control the line of scrimmage, three linebackers fill gaps and flow to the ball, and the secondary provides run support from depth. The 4-3 is gap-sound and difficult to run against when executed correctly. Linebacker play is the key to run defense. Linebackers must read their keys (offensive line movement, running back path) and fill their assigned gaps aggressively. Hesitation creates holes. Over-pursuit creates cutback lanes. Disciplined, aggressive linebacker play is the difference between a good run defense and a great one. Defensive line technique matters. Defensive tackles must hold their ground against double teams. Defensive ends must set the edge and force runs back inside. For run defense strategy guides, cfb27.com has comprehensive resources.