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BJJ Half Guard System and Sweeps

Half guard (meia guarda) is a dynamic bottom position in which you trap one of the opponent's legs between both of yours. It provides a reliable platform for sweeps, submissions and back takes at every level of BJJ.

Reviewed by CNX BJJ
Last updated: June 2026
Safety disclaimer: Practise these techniques under the supervision of a qualified instructor. Apply submissions slowly and with control. Tap early and tap often.

What Is the BJJ Half Guard?

The BJJ half guard, known in Portuguese as meia guarda, is a position in which the bottom player traps one of the top player's legs between both of their own legs. Unlike a purely defensive survival position, the modern half guard is an active, threat-rich system. From here you can force sweeps, attack a kimura or guillotine choke, take the back, or transition to more advanced guard variants such as deep half guard.

The position rose to prominence through practitioners such as Roberto "Gordo" Correa, who developed an extensive half guard game after a knee injury prevented him from playing closed guard. Today, half guard is taught as a core position at virtually every BJJ school worldwide, and its techniques appear consistently in both IBJJF and ADCC competition footage.

Note that "half guard" covers a family of related positions. The sections below address the standard underhook half guard as the foundation, with variations covered separately. If you are looking at closed guard, see our closed guard guide.

Setup and Prerequisites

You enter half guard whenever you trap one of the opponent's legs. This can happen deliberately (pulling half guard as your preferred starting position) or reactively (retaining half guard as the opponent attempts to pass your closed guard or full guard). Both routes are common in training and competition.

The two physical prerequisites before attempting any offensive action from half guard are:

  • Being on your side, not your back. A flat half guard, where your back is on the mat, limits your options and makes you easy to pass. Roll onto your inside hip as quickly as possible.
  • A frame or knee shield (joelhada escudo). Place your inside knee across the opponent's torso to create distance and prevent them from smashing through to chest-to-chest control. Without a frame or knee shield, you cannot fight for an underhook.

Once you have a frame and are on your side, the main battle begins: fighting for the underhook (gancho por baixo) on the side of the trapped leg.

Step-by-Step Execution: The Underhook Sweep

The underhook sweep via the dog fight (briga de cachorro) is the most fundamental offensive sequence from half guard. Master this before exploring variations.

  1. Establish the half guard. From your back, trap the opponent's near leg between both of yours. Your inside leg hooks behind their knee; your outside leg crosses over the top and locks your feet together, or hooks at the ankle. Roll onto your inside hip immediately.
  2. Apply the knee shield. Drive your inside knee across the opponent's torso at roughly hip height. Use your outside hand to frame against their neck or shoulder. This keeps them from driving their weight through and stops them obtaining chest-to-chest control.
  3. Fight for the underhook. Thread your near arm under the opponent's arm on the same side as their trapped leg. Drive your shoulder forcefully into their armpit and secure a deep underhook, reaching your hand around their back toward their far hip. Your shoulder should be snug in their armpit with no gap.
  4. Take a back step or come to your knees. Using the underhook for leverage, roll toward the opponent and push onto the knee of your free leg. You are now in the dog fight position. Both you and the opponent are on one knee, facing the same direction, with their leg still trapped and your underhook still in place.
  5. Drive through for the sweep. From the dog fight, drive your shoulder and chest through the opponent's body. Simultaneously use your half guard leg to hook behind their trapped knee and trip them backward. The combination of forward drive and leg trip topples them onto their back.
  6. Consolidate top position. Land in top half guard or top side control. Free your leg from the entanglement, settle your weight, and advance to a dominant position such as side control (controle lateral) or mount.

Common Mistakes

  • Staying flat on your back. This is the most common error at beginner level. A flat half guard removes almost all your offensive options and accelerates the opponent's pass. Roll onto your hip at the earliest opportunity and maintain that posture throughout.
  • Reaching for the underhook too early. If you attempt the underhook before establishing your knee shield, the opponent can flatten you and obtain chest-to-chest control before your arm reaches their armpit. Frame first, then hunt the underhook.
  • Shallow underhook. An underhook where your hand only reaches the opponent's shoulder rather than around their back is much weaker and easier to strip. Drive deep so your shoulder is in their armpit and your hand reaches their far hip or lower back.
  • Stopping at the dog fight. Many beginners reach the dog fight position and then stall, unsure what to do next. The dog fight is a transitional phase, not a resting point. Commit to the forward drive and leg trip immediately.
  • Crossing your feet instead of hooking. Locking your ankles around the opponent's leg is less secure than a proper knee-over hook. The opponent can straighten their leg and step out, or apply ankle pressure. Hook with your leg rather than squeezing with crossed ankles.
  • Ignoring the opponent's cross-face. If the opponent establishes a cross-face (passing their near arm across your face to flatten you), it becomes very difficult to fight for the underhook. Use your outside hand to block or strip the cross-face as a priority before committing to the underhook battle.

Variations and Follow-Ups

The standard underhook half guard is a gateway to a wider system of related positions and attacks. Once you are comfortable with the foundation, explore the following variations.

Knee shield half guard (Z-guard): A more defensive variant in which you keep your inside knee firmly across the opponent's chest or hip throughout the engagement. The knee shield creates reliable distance and is an excellent entry point for beginners, as it limits the opponent's ability to flatten you. From the knee shield you transition to the underhook when the opportunity arises.

Deep half guard: You slide underneath the opponent until your head is between their legs and your outside shoulder is behind their far knee. You control their far leg with a two-on-one grip. Sweeps from deep half guard include the Homer Simpson sweep (rolling forward to come on top) and the waiter sweep. Deep half guard requires comfort with being underneath the opponent and is generally introduced at blue belt level.

Lockdown: A leg entanglement in which you hook your outside foot behind the opponent's knee and straighten your inside leg to extend and hyperextend the lockdown, stretching the trapped leg. The lockdown immobilises the opponent and opens the electric chair sweep and calf slicer attacks. It is central to the 10th Planet Jiu-Jitsu system and is popular in no-gi grappling.

Old school sweep: From the underhook position, instead of coming to your knees for the dog fight, you reach your free hand to the opponent's far ankle. By rolling toward the trapped leg side while controlling the ankle, you log-roll the opponent onto their back. This sweep works particularly well against opponents who base strongly with both feet.

Half guard to back take: In the dog fight position, if the opponent defends the forward drive by dropping their weight back, you can release the underhook, reach for a seat-belt grip (one arm across the chest, one arm under the armpit), and pull them onto your back for a back take. The back take from the dog fight is one of the highest-percentage attacks in BJJ and is seen frequently at advanced levels.

Kimura from half guard: When you have an underhook and the opponent reaches around your head with their far arm, you can switch from the underhook to a figure-four kimura grip on their far arm. This is a high-percentage submission or sweep-to-submission chain from half guard.

Competition Context

Half guard is a legal and widely used position at all levels of IBJJF competition. Because half guard is a positional concept rather than a submission technique, there are no belt-level restrictions on playing it.

Under IBJJF rules, successfully completing a half guard sweep (going from bottom to top) scores 2 points. If a reversal occurs during a scramble from the dog fight, the points are awarded only when the top player has stabilised in the new dominant position for a count of three seconds.

Under ADCC rules, which use a points-after-overtime system, sweeps from half guard score 2 points and back takes score 3 points. The ADCC ruleset also permits heel hooks at all levels, which means deep half guard and lockdown positions carry additional submission threat that is not present in IBJJF competition below brown belt.

Guard passing from top half guard is a common IBJJF scoring action, earning 3 points for a completed pass. As the bottom player, you must remain active to deny the pass and score the sweep before the opponent earns their points.

Drilling Suggestions

Effective drilling of the half guard system follows a logical progression from isolated mechanics to live positional sparring.

Solo drills: Practise the hip escape (shrimping) movement that keeps you on your side. Rolling from flat to your inside hip repeatedly builds the motor pattern that underpins all half guard defence. Shoulder-in drills, where you drive your shoulder into an imagined armpit from your knees, reinforce the underhook body mechanics.

Cooperative paired drills: Work the full underhook sweep sequence (knee shield, underhook, dog fight, drive and trip) with your partner offering no resistance. Aim for ten clean repetitions per side per session. Focus on smoothness and sequence accuracy rather than speed.

Graduated resistance: Progress to 30 to 50 percent resistance where the partner defends the underhook passively. This reveals technical gaps, particularly in the transition from flat to the side and in the depth of the underhook, without creating a live scramble.

Positional sparring: Set starting positions with one player in bottom half guard and the other on top. The bottom player scores a point for any sweep or back take; the top player scores for completing a guard pass. Rotate every three minutes. This mirrors competition pressure while concentrating volume on the half guard position specifically. Begin at three rounds per session and increase as your confidence grows.

Complement your positional sparring with rounds started from the standard closed guard position to develop fluency in transitioning between the two guards when the opponent begins to open or pass your closed guard.

Frequently Asked Questions

Half guard (meia guarda) is a bottom position in which you trap one of your opponent's legs between both of yours while they are on top. It is an active guard with sweeping, submission and back-take options, rather than simply a defensive position.
Both positions have merit for beginners. Closed guard is often taught first because it limits the opponent's movement. Half guard tends to feel more natural for larger athletes or those who find closed guard too physically demanding, and its sweeping system translates well to no-gi. Many coaches teach both from white belt onwards.
The underhook (gancho por baixo) is the key control in half guard. You thread your near arm under the opponent's arm on the trapped-leg side, drive your shoulder into their armpit and reach around their back. Winning the underhook allows you to come up to your knees and attack sweeps, back takes and submissions. Losing the underhook battle leaves you flat and vulnerable to guard passing.
The knee shield (joelhada escudo) is a framing tool used from bottom half guard. You place your inside knee across the opponent's torso, hip or chest to create distance and prevent them from flattening you out. Combined with a frame on the neck or shoulder, the knee shield gives you the space needed to fight for an underhook or transition to deep half guard.
The dog fight (briga de cachorro) occurs when the bottom player has won the underhook and come up to one knee, while the top player remains on one knee with their leg still trapped. It is a transitional scramble phase. From here the bottom player can drive through for a sweep, reach for a seat-belt grip to take the back, or attack a body lock. The top player can try to re-flatten the bottom player, strip the underhook or counter-sweep.
The primary sweeps from half guard include the underhook sweep (dog fight to top), the old school sweep (log roll using the free hand on the opponent's ankle), the deep half guard Homer Simpson sweep, and the lockdown electric chair sweep. Each sweep follows on naturally from the underhook battle and can be chained together when the opponent defends.
Yes. Half guard is a positional concept rather than a submission, so there are no restrictions on using it at any belt level in IBJJF competition. Submissions available from half guard, such as the kimura and guillotine choke, are also legal at white belt under IBJJF rules. Heel hooks, which are sometimes attacked from deep half guard, are restricted to brown belt and above in IBJJF events.
Deep half guard is a variation in which you slide underneath the opponent so that your head is between their legs and your outside shoulder is behind their far knee. From this position you control their far leg with both arms and use rocking or rolling motions to upset their balance and execute sweeps. It was popularised at the highest levels of competition and is suitable for practitioners from blue belt upwards.
The two main defences against guard passing from half guard are the knee shield (to maintain distance) and fighting to recover the underhook (to threaten a sweep). If you are flattened on your back and lose both the underhook and the knee shield, your opponent is close to completing the pass. Always prioritise staying on your side rather than your back, as a flat half guard is very difficult to defend.
The lockdown is a leg entanglement used from bottom half guard in which you hook your outside foot behind the opponent's knee and use your inside foot to extend the lockdown, stretching the trapped leg. It immobilises the opponent and creates opportunities for the electric chair sweep and submissions. It is associated with Eddie Bravo's 10th Planet Jiu-Jitsu system and is commonly used in no-gi grappling.
Yes. Half guard is highly effective in no-gi grappling. The underhook system translates directly, and the lack of a gi collar grip often makes the underhook easier to secure as the opponent cannot stiff-arm you using a cross-collar grip. The lockdown and deep half guard variations are particularly popular in no-gi settings and at ADCC-ruleset competitions.