Guard / Bottom / Underhook
One leg trapped, and an underhook battle that decides whether this is a guard or a pin with extra steps.
| Category | Guard |
|---|---|
| Difficulty | Intermediate |
| Applies to | Gi and no-gi, with substantially different grip games |
| Primary risk | Shoulder and neck load when flattened; knee strain in deep variations |
| Status | Published entry |
The problem
Half guard is the most commonly reached and most commonly misunderstood position in grappling, because it covers two states that look similar and play completely differently: half guard where you have inside position, and half guard where you are being flattened.
The second is not a guard. It is side control that has not finished arriving.
Objective
Establish and hold inside position — an underhook or a knee shield, ideally both — so that the trapped leg is a threat rather than a formality, and get to your side.
Core concept
The trapped leg is not what makes this a guard. Being on your side with an upper-body connection is. A practitioner flat on their back with a leg trapped is being passed slowly.
Two structures do the work. The knee shield sets a floor on how close the top player can get. The underhook determines who can turn whom. Losing both means the position is over regardless of what your legs are doing.
Key mechanics
- Get to your side. Before anything else. Flat is losing.
- Knee shield in. Shin across their hip or torso, creating distance and preventing chest connection.
- Win the underhook. Or, failing that, deny theirs with a strong frame at the shoulder.
- Head position. Their cross-face is the thing that flattens you. Your own head posture is part of the defence, not an afterthought.
- Keep the trapped leg active. A leg that merely holds is a leg they will free. It should be off-balancing or preparing to elevate.
Common errors
- Lying flat and hoping the leg holds.
- Holding the underhook with the arm rather than the shoulder and hip behind it.
- Letting the knee shield get flattened without immediately changing to something else.
- Treating deep half as a first option rather than a specialised one with its own risks.
Safety
Being flattened in half guard compresses the ribs and neck. Deep half places load on the knee of the trapped leg in a position it cannot easily defend. Do not stay in a flattened position to prove a point, and do not enter deep variations at speed while learning.
This entry is reference material. It cannot see your body, your training history or your partner, and it is not a substitute for instruction from a qualified coach who can.
Training progression
- Start on your side with the knee shield established. Top player’s only job is to flatten you. Yours is to stay on your side. Nothing else.
- Add the underhook battle. Both players compete for it from a neutral start.
- Start flattened. Objective is to get back to your side. This is the least pleasant drill on this list and the most useful.
- Add sweeps and back-takes only once you can reliably hold the two structures.
Related
- Guard Retention
- Journal: Understanding inside position in no-gi — long-form Journal essay, written and awaiting publication
- Knee Cut