What Z guard is
Z guard is a half guard played on your side, with your top knee and shin in front of your partner’s body as a frame. It belongs with the half guards in our guide to BJJ guards. Grapplers use it to keep a heavier or stronger partner from settling their weight on them while they work toward an underhook, a sweep or an entry to the legs.
Sources disagree on what the name covers. Many instructors and technique libraries treat Z guard and the knee shield half guard as the same position. Others separate them: in their usage, a knee shield has the knee high, near your partner’s chest or shoulder, and Z guard has the shin lower, framing against the hip, sometimes with your feet locked together around the trapped leg. This article uses Z guard for both and notes where the height of the knee matters.
Setting the knee shield and the hook
With your hips angled toward your partner, the top knee goes in front of their body and the shin angles across it. A higher knee holds more distance. A lower shin keeps you closer and holds the thigh more tightly. Your bottom leg hooks over the trapped leg, often at the ankle, and keeps it between your legs.
The shield also works as a lever. Pushing your partner’s hips back with the knee while the bottom leg holds their leg can make them sit back on their heels, which gives you room to attack.
Your arms are the second layer. They hold your partner’s shoulders and arms at the distance the shield sets, and the grips they use change between gi and no-gi.
Grips
- Collar gripA hand in the collar, often the cross collar, lets your forearm hold their upper body away.
- Sleeve gripHolding a sleeve keeps that arm from posting or reaching for your head.
- Far leg pants gripGripping the pants on the free leg stops them from stepping or posting with it.
Main attacks
- Underhook to the back
- Shaolin sweepYou pull their arm across you, drop the shield so their shoulder falls to the mat, and roll backward to take them over.
- Kimura
- Arm drag
- Armbar
Grips
- Wrist controlA grip on the wrist keeps that hand from crossing your face.
- Frame on the shoulder or neckYour forearm or hand braces against their upper body.
- UnderhookYour arm under theirs, reaching toward their back.
Main attacks
- Dogfight and back take
- Kimura
- Armbar
- Single leg X and leg locks
Distance
Half and knee shield
Rules
Heel hooks and knee reaping from Z guard leg entries are restricted by belt, age division and gi or no-gi in many rulesets.
Sweeps, back takes and submissions
Many sweeps from Z guard start with an underhook. At the right moment you lower the shield, slide your arm under your partner’s arm and come up onto your elbow. From there you can come up to your knees beside them, a position often called the dogfight, and go on to take the back or finish a sweep. An arm drag reaches the back by a different route: you pull an arm across your body and climb behind it.
When your partner posts a hand or lets an arm drift away from their body, the kimura is available. If they defend by pulling the arm in tight, the kimura grip can still carry you up to a sweep or the back. A partner who drives forward to crossface can be caught in an armbar as your shield leg swings over their head. The shield also places your legs where you can slide under to single leg X or X guard and attack the legs.
How partners pass Z guard
A passer first has to deal with the shield. Some push the knee down to the mat, some grip the pants or ankle and stretch the leg straight, and some flatten you with a crossface and an underhook before they touch your legs. With the shield out of the way, common passes include the knee cut, which slides a knee across your bottom leg, the smash pass, which folds your knees together and flattens you, the backstep and the leg weave.
Respond at the first step. When your knee is pushed down or stretched, bring it back in front of their body while you still have your frames. If it is pinned and cannot return, go for the underhook and come up before the pass settles.
Common Z guard mistakes
Lying flat on your back is the first. The shield then points at the ceiling, and your partner can drive over it onto your chest.
Dropping your hands is the second. Once your partner controls your head, you have usually lost control of the position, even with the shield still up.
A loose bottom hook is the third. It lets your partner free the trapped leg and pass, especially when they move their hips.
What a reviewer looks for in your Z guard
Watching your footage, a black belt finds the moment the shield went down and what caused it: a smash, a leg stretched by a grip, or a crossface that reached your head first. They also check whether you stayed on your side and whether you took the underhook when it was there or only after the pass had started. In a roll review, a verified black belt talks you through each of those moments in a voiceover on your own rolls.