The foundation

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The offensive line cannot block every possible defender when the defense sends more rushers than protectors. Linemen communicate which gaps and defenders they own, while backs or tight ends may help. The quarterback must identify threats that remain unblocked.

See it in context

  1. A double-mug front threatens both A gaps and can force the center to declare which linebacker the line will handle.
  2. A screen invites rushers upfield, then releases blockers into the space they vacated.