Deep Half Guard
Deep half guard — bottom player scoops under, head near the far hip. Sweeps from underneath as the top player tries to flatten.
Adapted from the original page. Grappling.Games did not write this. Sources.
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Deep half guard is a variant of half guard in which the bottom player has gone under rather than up. Instead of fighting for the underhook and attempting to come to the side, the bottom player ducks under the top player’s body — threading their head under the top player’s torso — and ends up with their chest against the top player’s inner thigh, their head near the far hip, and the trapped leg hugged tightly across their chest. The top player’s weight is now largely over the bottom player’s body rather than to the side of it.
This change in geometry changes everything about the sweep mechanics. In standard half guard, the bottom player attacks from beside the top player. In deep half, the bottom player attacks from underneath and can use the top player’s own weight against them. The top player, trying to flatten or advance, often drives their weight down — which is the same direction the bottom player uses to generate sweeping force. Every attempt by the top player to flatten the bottom player in deep half feeds energy into the sweep.
Deep half is a variant of half guard and uses the same invariant framework. The concession on the foot line is identical to standard half guard — one leg is trapped, one side of the line is already given up. In deep half, the bottom player has committed further by going under, which creates different sweep geometry but does not change the underlying principles governing hip mobility, chest connection, and destabilisation timing.
Ruleset contextADCC Legal IBJJF No-Gi Legal The Invariant in Action
INV-G01Invariant "The bottom player must maintain their feet between or at the line of the top player's knees. Losing this line allows the top player to advance without engaging the guard."
Why it works hereDeep half operates the foot line from underneath rather than in front. The bottom player's feet are below the top player's body, and the trapped leg hugged tight to the chest is the active line — when the leg hug loosens, the top player's leg extracts and the position passes. The chest-to-thigh connection is part of the same control structure: as long as the chest is glued to the inner thigh, the passer cannot step their hips through to advance.
See full invariant page → From deep half, the foot line operates from below the top player’s body. The bottom player’s feet are under the top player rather than in front of them. The principle remains: the bottom player’s legs must control the top player’s movement. In deep half, this means the leg hugging the trapped thigh must stay tight — a loose grip on the trapped leg allows the top player to extract and pass. The bottom player’s body, threading under the top player, is itself part of the control structure. As long as the chest-to-thigh connection is maintained, the top player cannot advance freely.