Half Guard BJJ: Sweeps, Submissions, and the Underhook Battle

The half guard was once considered the last stop before getting passed. Old-school BJJ players treated it like a consolation prize — you lost full guard, and now you were just hanging on. Then Roberto “Gordo” Correa tore his knee ligaments, couldn’t play full guard, and turned the half guard into one of the most dangerous attacking positions in grappling. That was the early 1990s. Three decades later, half guard is one of the most studied, most versatile, and most essential positions in Brazilian jiu jitsu.

Whether you train in the gi or no-gi, whether you compete at white belt or black belt, your half guard game will define how effectively you recover from bad positions and how creatively you attack from underneath. This guide breaks down everything you need to know — from the foundational frames and underhook battles to the sweeps, submissions, and deep half entries that make this position so powerful.

What Is Half Guard in BJJ?

Half guard is a ground position where you control one of your opponent’s legs between both of yours while they are on top. Your body is typically on its side or angled beneath them, and the position exists in a grey zone between full guard (where you have both legs wrapped around your opponent) and a fully passed guard (where you have no leg control at all).

In competitive BJJ and MMA, half guard shows up constantly. Fighters end up there after failed takedown attempts, scrambles, and guard retention sequences. According to grappling analysts, half guard accounts for a significant percentage of all guard positions used in high-level competition, and the position has spawned an entire ecosystem of specialized variations.

Half Guard Variations You Need to Know

Half guard is not a single position — it is a family of positions, each with different offensive and defensive properties. Understanding which variation you are in determines which sweeps, submissions, and transitions are available to you.

Knee Shield Half Guard

The knee shield (also called Z-guard) places your top knee across your opponent’s chest or hip, creating a powerful frame that prevents them from flattening you out. This is the single most important defensive structure in half guard. The shield maintains distance, gives you time to work for the underhook, and opens up sweeps like the hip bump and overhead sweep. Top-level competitors like Bernardo Faria and Lucas Leite built entire championship-level games around the knee shield.

Underhook Half Guard

When you secure the underhook from bottom half guard — threading your arm under your opponent’s armpit and controlling their far shoulder — you gain the single most powerful offensive grip in the position. The underhook lets you sit up, come to your knees, take the back, or execute classic sweeps like the old school sweep and the plan B. Losing the underhook battle usually means you are about to get flattened and passed.

Lockdown Half Guard

Popularized by 10th Planet Jiu Jitsu founder Eddie Bravo, the lockdown uses a figure-four leg configuration to stretch out and control your opponent’s trapped leg. From here, you can hit the “whip up” to off-balance them, enter the electric chair sweep, or transition to the truck position for back attacks. The lockdown is especially effective in no-gi because it does not rely on grips that can be stripped.

Deep Half Guard

Deep half guard involves sliding your entire body underneath your opponent so that their weight is loaded over your hips and shoulders. From here, you have extremely high-percentage sweeps because you have disrupted their base entirely. Jeff Glover and Ryan Hall are among the competitors who brought deep half guard into the mainstream, and the position remains a staple at every level of competition.

The Underhook Battle: Why It Decides Everything

If there is one concept that separates good half guard players from bad ones, it is the underhook. UFC commentators call it the “battle for the underhook” in wrestling exchanges, and the same principle applies on the ground in BJJ.

From the bottom, the underhook gives you the ability to sit up into your opponent, come to your knees, and start dictating the exchange. Without it, you are flat on your back with a heavy top player smashing through your guard. Here is how the underhook battle typically plays out:

Step 1: Frame and create space. Before you can get the underhook, you need to prevent your opponent from crossfacing you and flattening you out. Use your inside forearm to frame against their neck or shoulder. Your outside hand controls their far wrist or sleeve.

Step 2: Hip escape to create the angle. Shrimp your hips away from your opponent to create enough space to thread your arm underneath their armpit. If you try to get the underhook while flat on your back, you will fail.

Step 3: Secure the underhook deep. Your hand should reach their far shoulder blade or lat, not just their armpit. A shallow underhook gets stripped easily. A deep one locks you to their body.

Step 4: Rise to your side or sit up. With the underhook secured, turn your body to face them. You are now in an attacking position where sweeps and back takes become available.

5 Essential Half Guard Sweeps

Once you have your frames, your knee shield, and your underhook working, the sweep game opens up. These five sweeps form the backbone of an effective half guard system and work at every level of competition.

1. The Old School Sweep

This is the foundation of the underhook half guard game. With the underhook secured, you reach your free hand behind your opponent’s far knee. Drive forward off your bottom knee while pulling their leg out from under them. You end up in top half guard or side control. This sweep works because it attacks your opponent’s base at two points — the underhook disrupts their upper body while the leg grab removes their lower body support.

2. The Plan B (Back Take)

When your opponent defends the old school sweep by blocking your hand from reaching their far leg, you switch to Plan B. Instead of driving forward, you use the underhook to circle behind them. Release your leg triangle, come to your knees, and take the back with seatbelt control. This sweep-to-back-take sequence is one of the highest-percentage chains in BJJ because it forces your opponent to choose between getting swept or giving up their back.

3. The Electric Chair Sweep

From the lockdown position, you hit the “whip up” by extending your legs to stretch your opponent’s trapped leg while bridging your hips upward. This off-balances them forward. You then reach your far arm underneath their far leg, controlling it in the crook of your elbow. Drive up and over to sweep them directly into mount. The electric chair also doubles as a brutal submission if your opponent does not release the trapped leg — the groin stretch forces a tap from flexible and inflexible grapplers alike.

4. The Deep Half Waiter Sweep

From deep half guard, you control your opponent’s trapped leg at the knee and ankle. Your “waiter” hand reaches up between their legs and hooks their far thigh from behind — like a waiter carrying a tray overhead. From this grip, you extend your body and roll them over your shoulder. The waiter sweep works because your opponent cannot post with their far leg, and their weight is already committed over your body. Competitors like Jeff Glover hit this sweep in competition against world-class opponents consistently.

5. The Knee Tap Sweep

When you have the underhook and your opponent posts their far leg wide to defend the old school sweep, the knee tap becomes available. Instead of reaching behind their far knee, you push their near knee backward while driving into them with the underhook. This collapses their base in the opposite direction from what they expect. The knee tap is simple, does not require a lot of athleticism, and works beautifully against larger opponents who rely on their weight to maintain top position.

Submissions From Half Guard

Half guard is primarily a sweeping position, but several high-percentage submissions are available, especially when your opponent overcommits to defending sweeps. Knowing these attacks forces the top player into a dilemma: defend the sweep and get submitted, or defend the submission and get swept.

The Kimura

The kimura is the bread-and-butter submission from half guard. When your opponent posts their hand on the mat to defend a sweep, you can wrap a figure-four grip around their wrist and elbow. The kimura works as both a submission and a powerful sweeping tool — you can use the grip to off-balance them even if they defend the shoulder lock itself. Stephan Kesting of Grapplearts calls the kimura the highest-percentage submission from half guard when applied correctly.

The Guillotine

When the top player drives forward with a crossface or tries to smash through your knee shield, their head drops — and the guillotine becomes available. Wrap your arm around their neck, lock a chin strap or arm-in guillotine grip, and either finish the choke from bottom or use it to sweep to top and finish from mount. The guillotine from half guard is especially effective in no-gi where there are fewer defensive grips available.

The Loop Choke (Gi Only)

One of the most deceptive submissions in the gi game, the loop choke catches aggressive top players who drive into your half guard without respecting your collar grips. You feed your cross grip deep into their far collar, then use your knee shield to create the angle needed to cinch the choke. The beauty of the loop choke is that it is almost invisible — your opponent does not realize they are being choked until it is too late.

The Kneebar

From deep half guard, the kneebar is a natural attack. When your opponent tries to extract their trapped leg, you can transition to a kneebar by controlling their ankle and extending your hips against their knee joint. This is a higher-risk submission because you give up your guard position if you miss it, but at advanced levels, the deep half to kneebar connection is a well-drilled pathway. Lachlan Giles — the ADCC veteran and renowned instructor — has demonstrated this combination extensively in his instructional content.

John Danaher on Building a Half Guard System

No discussion of systematic BJJ is complete without John Danaher. In this breakdown, Danaher explains the principles behind building a complete half guard game — from the initial frames to the sweep and submission chains that make the position so effective. Watch how he connects the underhook battle to the sweeping system:

Common Half Guard Mistakes

Even experienced grapplers make critical errors from half guard that turn an attacking position into a liability. Here are the most common mistakes and how to fix them.

Staying flat on your back. This is the number one mistake. When you are flat, the top player can crossface you, drive their shoulder into your jaw, and pass at will. You must always be on your side with frames engaged. If you are flat in half guard, you are not playing half guard — you are getting passed.

Only using your legs to hold. Many beginners squeeze their legs desperately around their opponent’s trapped leg and do nothing with their upper body. Your legs are just the anchor. Your arms — frames, underhooks, and grips — are what make the position work offensively.

Neglecting the knee shield. Without the knee shield, you are giving your opponent free access to flatten you and crossface. The shield should be your default position whenever you arrive in half guard before you decide on your next move.

Fighting for the underhook when flat. You need to hip escape first, create the angle, and then insert the underhook. Reaching for it while flat usually results in your opponent passing to side control while your arm is trapped underneath them.

How to Drill Half Guard Effectively

Developing a strong half guard game requires structured drilling, not just sparring. Here is a proven drilling sequence that you can use in every training session:

Warm-up drill (5 minutes): Start in bottom half guard. Your partner applies moderate pressure from the top. Practice hip escaping, inserting the knee shield, and getting the underhook. Reset and repeat. The goal is making these three movements automatic — shield, shrimp, underhook.

Sweep chain drill (10 minutes): Work the old school sweep to Plan B sequence. Your partner defends the first sweep, and you immediately transition to the back take. Then add the knee tap as a third option. This builds the chain reaction that makes half guard attacks so difficult to defend — your opponent cannot stop all three options simultaneously.

Positional sparring (10 minutes): Start in bottom half guard, and your partner tries to pass while you try to sweep or submit. Three-minute rounds, then switch. This is where you learn to apply techniques against resistance and discover which sweeps work best for your body type and game.

Flow rolling from half guard (5 minutes): Light, cooperative rolling where both partners cycle through half guard positions. The bottom player practices entries into deep half, lockdown, and knee shield. The top player practices passes. Nobody goes hard — the goal is movement recognition and muscle memory.

Half Guard in MMA vs. Sport BJJ

Half guard plays differently depending on the ruleset. In sport BJJ, you can play a relaxed, patient half guard game — working for sweeps and submissions without worrying about strikes. In MMA, the dynamic changes dramatically because the top player can rain down ground and pound from the half guard position.

MMA fighters who end up in bottom half guard need to prioritize getting back to their feet or sweeping to top position immediately. The lockdown is particularly useful in MMA because it neutralizes the top player’s ability to posture up and throw power strikes. Fighters like Ben Saunders and Demian Maia have shown how an active half guard can control MMA fights even from the bottom, using the position to set up sweeps and return to the feet.

In no-gi sport BJJ and ADCC competition, half guard takes on yet another dimension. Without gi grips, the underhook becomes even more important, and the lockdown becomes a primary control tool. Deep half guard works equally well in both gi and no-gi because it relies on body positioning rather than grips.

Building Your Half Guard Game Plan

A complete half guard system does not mean knowing every technique. It means having a clear decision tree that you can follow under pressure. Here is a simple framework that works at every belt level:

Default position: Knee shield with inside frame on the neck. This is where you start every time you arrive in half guard.

Primary goal: Get the underhook. Hip escape, clear the crossface, thread the arm deep.

With the underhook: Attack the old school sweep. If blocked, transition to Plan B (back take). If both are blocked, try the knee tap.

Without the underhook: Use the knee shield to create distance and recover. If you cannot get the underhook, transition to lockdown or enter deep half guard as alternative pathways.

Submission layer: When your opponent posts a hand to defend sweeps, attack the kimura. When they drive forward into your shield, look for the guillotine. In the gi, keep your collar grips active for the loop choke.

This decision tree gives you options at every stage of the position without overwhelming you with techniques. As your skills develop, you can add more branches — but this framework will carry you from white belt to black belt.

The half guard is not a consolation prize. It is one of the most creative, effective, and reliable positions in all of Brazilian jiu jitsu. From Roberto Gordo’s pioneering work in the 1990s to the modern innovations of Lachlan Giles, John Danaher, and the 10th Planet system, the half guard continues to evolve — and every serious grappler needs it in their toolbox.