Jon Thomas short: pummel under the arms to the collar and pin your elbow to their chest so they cannot re-pummel and rebuild posture. Small detail that makes collar chokes and armbars easier.
Control
Breaking Posture
Using the legs and grips to pull the opponent's head down from closed guard so attacks become available.
Also called breaking posture from guard, pulling them down, closed guard posture break.
Where it shows up
Related techniques
Shorts
YouTube videos
Danaher's closed-guard fundamentals with Bernardo Faria: posture, grips and why the guard fails before any sweep is attempted.
Roger Gracie with Bernardo Faria on why his closed guard works: the collar, the hips and refusing to play a loose open guard.
Jared Welman fixes the closed guard armbar: control posture first, isolate the arm with a two-on-one, back-stop the elbow with your arm and pin the far shoulder with your foot.
Gordon Ryan on using the knee pull rather than the arms to break posture, then creating angle so triangles, back takes, pendulum sweeps and armbars all open from the same movement.
Gustavo Gasperin breaks posture with the legs, deflects an arm, wraps it and hip escapes to slide the shin across for a basic triangle setup.
Match-footage breakdown of Roger Gracie's closed guard: two-on-one arm drag to the back take, the flower sweep when they resist, and the cross collar grip when they hide the arm. Analysis rather than a drill-along.