Underhook Sweep from Half

Play as Attacker Play as Defender

The Underhook Sweep from Half Guard is a fundamental attacking technique that exploits the power of the underhook control to off-balance and sweep opponents from bottom half guard. This sweep represents one of the highest percentage attacks available from half guard, combining proper angle creation, hip movement, and timing to reverse position. The technique capitalizes on the underhook’s ability to control the opponent’s posture and weight distribution, creating the mechanical advantage necessary to complete the reversal. By establishing the underhook on the trapped leg side, you create a powerful lever that disrupts your opponent’s base while simultaneously generating the momentum needed for the sweep. This technique serves as a cornerstone of modern half guard systems, offering a reliable pathway from defensive bottom position to dominant top control.

From Position: Half Guard (Bottom) Success Rate: 58%

Possible Outcomes

Result	Position	Probability
Success	Side Control	65%
Failure	Half Guard	25%
Counter	Half Guard	10%

Attacker vs Defender

	Attacker	Defender
Focus	Execute technique	Prevent or counter
Key Principles	Secure deep underhook control before initiating sweep…	Win the underhook battle first - prevent the deep underhook …
Options	6 execution steps	4 defensive options

Playing as Attacker

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Key Principles

• Secure deep underhook control before initiating sweep

• Create angle by shifting hips away from opponent

• Drive forward and upward with underhook leverage

• Use opponent’s pressure against them through timing

• Maintain tight connection throughout sweep motion

• Control opponent’s far hip to prevent counter-base

• Finish sweep by coming up on top in secure position

Execution Steps

• Secure the underhook: Drive your arm deep under opponent’s armpit on the trapped leg side, wrapping around their back. You…

• Create the angle: Shift your hips out and away from your opponent at approximately 45 degrees, moving your shoulders t…

• Control the far hip: With your free hand, establish a strong grip on opponent’s far hip, belt, or pants. This grip preven…

• Load and bridge: Come up onto your shoulder on the underhook side, creating a strong bridge position. Your head shoul…

• Drive the sweep: Explosively drive your underhook arm upward and forward while simultaneously pulling their far hip w…

• Complete the reversal: As opponent rolls over, maintain your underhook control and come up on top, transitioning into side …

Common Mistakes

• Attempting sweep without sufficient angle creation

  • Consequence: You end up lifting opponent’s dead weight directly upward with no mechanical advantage, making sweep nearly impossible and exhausting your energy
  • Correction: Always establish 45-degree angle by moving hips away before initiating sweep. The angle is the foundation of all leverage-based sweeps

• Underhook is too shallow or arm extends away from body

  • Consequence: Opponent easily whizzers or controls your arm, nullifying your primary sweeping lever and leaving you vulnerable to passes
  • Correction: Drive underhook deep with shoulder tight to opponent’s ribs. Keep elbow close to your own body to maintain structural strength

• Failing to control opponent’s far hip

  • Consequence: Opponent easily posts their far leg for base, completely shutting down the sweep before it develops
  • Correction: Secure far hip grip early in setup and actively pull it toward you throughout the sweep to prevent posting

Playing as Defender

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Key Principles

• Win the underhook battle first - prevent the deep underhook from being established through active hand fighting and crossface pressure

• Maintain heavy chest-to-chest pressure with hips low to deny the angle creation that makes the sweep mechanically possible

• Apply whizzer control immediately when opponent secures underhook, driving your overhook deep and pulling their elbow toward their hip

• Keep your far leg posted wide with base to prevent being tipped over even if the sweep is initiated

• Drive crossface pressure to flatten opponent’s shoulders to the mat, eliminating the side angle they need for leverage

• Control the pace by initiating your own passing sequences rather than passively allowing bottom player to set up sweeps

Recognition Cues

• Opponent’s arm drives deep under your armpit with their shoulder connecting to your ribs on the trapped leg side, establishing the primary sweeping lever

• Opponent shifts their hips away from you at an angle, moving from flat on their back to their side facing you - this angle creation is the setup phase

• Opponent’s free hand reaches for your far hip, belt, or pants - this grip prevents you from posting your far leg for base

• Opponent begins loading their weight onto the underhook-side shoulder and elevating their hips, preparing the explosive driving phase

• Opponent’s head position shifts tight against your ribs on the underhook side, creating a tight connection point for the sweep

Defensive Options

• Establish deep whizzer over the underhook arm by threading your arm over their bicep and gripping your own thigh or their hip, then drive your shoulder weight down to flatten them - When: Immediately when opponent establishes underhook before they create significant angle or load their hips

• Post your far leg out wide at a 45-degree angle with your foot firmly on the mat, creating a wide triangular base that prevents being tipped over the sweeping trajectory - When: When you feel the sweep being loaded and your weight shifting toward the underhook side, or preemptively when opponent has established angle

• Drive heavy crossface pressure by dropping your shoulder into opponent’s jaw and neck while sprawling your hips back, flattening their shoulders to the mat - When: As a preventive measure before opponent establishes angle, or to counter early-stage sweep attempts before the explosive phase

Variations

Butterfly Half Underhook Sweep: From butterfly half position with underhook established, use butterfly hook on non-trapped side to enhance sweeping power. The butterfly hook adds additional elevation and makes it easier to sweep larger opponents. (When to use: When opponent’s weight is distributed evenly or when you need additional leverage against bigger training partners)

Underhook Sweep to Back Take: When opponent successfully defends the sweep by basing hard with their far leg, use the underhook to climb up their back instead of forcing the sweep. Transition directly from failed sweep attempt to back control by maintaining underhook and inserting bottom hook. (When to use: When opponent’s base is too strong for sweep completion or when they whizzer your underhook)

Knee Shield Underhook Sweep: Maintain knee shield while securing underhook, using the shield to create and maintain distance before committing to sweep. Drop knee shield at the moment of sweep execution for maximum power. This variation provides better defensive structure during setup. (When to use: Against aggressive passers who maintain heavy pressure and when you need defensive insurance during setup phase)

Waiter Sweep Connection: If opponent removes their weight and sits back to defend underhook sweep, immediately transition to waiter sweep by posting on your elbow, extending trapped leg, and using free leg to hook behind their far knee while maintaining underhook control. (When to use: When opponent recognizes sweep and backs their hips away, creating space)

Position Integration

The Underhook Sweep from Half Guard represents a cornerstone technique within the modern half guard bottom system, serving as both a primary attacking option and a hub that connects to numerous other techniques. This sweep exemplifies the systematic approach to half guard play by creating a clear offensive threat that forces opponents to react, with each reaction opening pathways to additional attacks. When integrated into a complete half guard game, the underhook sweep works in conjunction with deep half entries, old school sweeps, back takes, and various submission attempts to create a web of interconnected threats. The technique also serves as an essential bridge between defensive half guard retention and offensive top game, providing a reliable method to reverse inferior position into dominant control. Advanced practitioners use the threat of this sweep to manipulate opponent reactions, setting up their preferred attacks by forcing predictable defensive responses. The underhook itself becomes a fundamental control position that appears throughout BJJ, making this sweep an excellent vehicle for developing general grappling concepts that apply far beyond half guard alone.

Related Techniques

• Old School Sweep - Alternative sweep when underhook is whizzered

• Deep Half Entry - Transition when opponent flattens you out

• Half Guard to Back Take - Follow-up when sweep is defended with strong base

• Waiter Sweep - Chain attack when opponent sits back to defend

• Butterfly Sweep - Related technique using similar mechanics with butterfly hooks

• Knee Shield Half Guard - Starting position variation for defensive structure

• Kimura from Half Guard - Submission threat that creates underhook opportunities

• Lockdown - Alternative leg control method in half guard system

• Side Control - Ending position after successful sweep

• Dogfight Position - Intermediate position arising from contested underhook battles