The Underhook Sweep is a fundamental offensive technique from half guard bottom that exploits the powerful mechanical advantage of the underhook grip. This sweep operates on the principle of controlling your opponent’s center of gravity while simultaneously removing their base, creating an inevitable off-balancing moment that allows you to reverse position. The underhook provides crucial control of the opponent’s shoulder and upper body, preventing them from establishing effective crossface pressure and creating the angle necessary for the sweep.
This technique is particularly effective against opponents who commit their weight forward while passing, as it redirects their momentum against them. The sweep can be executed from various half guard configurations including traditional half guard, deep half guard, and knee shield variations, making it a versatile tool in your bottom game arsenal. Understanding the timing and mechanical principles of this sweep is essential for developing a complete half guard game, as it creates offensive threats that force opponents into defensive reactions, opening pathways to other attacks and transitions.
The underhook sweep functions as the central hub of half guard offense. Every defensive reaction your opponent makes to stop this sweep opens a different attack: wide base enables the old school sweep, whizzer defense opens back takes, backward weight shift allows butterfly transitions. This chain-reaction dynamic makes the underhook sweep indispensable for any serious half guard player.
From Position: Half Guard (Bottom) Success Rate: 55%
Possible Outcomes
| Result | Position | Probability |
|---|---|---|
| Success | Side Control | 55% |
| Failure | Half Guard | 25% |
| Counter | Flattened Half Guard | 20% |
Attacker vs Defender
| Attacker | Defender | |
|---|---|---|
| Focus | Execute technique | Prevent or counter |
| Key Principles | Secure deep underhook control before initiating sweep - hand… | Win the underhook battle proactively through crossface press… |
| Options | 6 execution steps | 4 defensive options |
Playing as Attacker
Key Principles
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Secure deep underhook control before initiating sweep - hand must reach at minimum to opponent’s far hip
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Create angle by getting onto your side and away from flat back position before any sweep attempt
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Remove opponent’s base by attacking their far leg or posting arm simultaneously with bridge
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Drive upward and forward at a 45-degree angle through the underhook to elevate opponent
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Time the sweep when opponent commits weight forward during passing or crossface attempts
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Maintain half guard leg control throughout the entire sweeping motion until top position is established
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Follow through immediately to side control with crossface conversion after reversal
Execution Steps
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Establish underhook control: From half guard bottom, work your inside arm deep under opponent’s armpit, reaching your hand to the…
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Create angle and get to side: Rotate your body onto your side, facing your opponent rather than lying flat on your back. Use your …
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Grip opponent’s far leg or control base: With your outside hand, reach across and grip opponent’s far leg behind the knee, or control their f…
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Bridge and drive through underhook: Explosively bridge your hips upward and into opponent while simultaneously driving forward and upwar…
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Pull opponent’s base and complete rotation: As you bridge and drive, pull strongly on their far leg or collapse their posting arm to eliminate t…
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Establish top position control: As you complete the sweep and land on top, immediately establish side control by spreading your base…
Common Mistakes
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Attempting sweep while lying flat on back without getting to side
- Consequence: No mechanical advantage, sweep lacks power, opponent easily counters with pressure and crossface control
- Correction: Always establish side-facing position first. Your shoulder should be off the mat and your body angled at approximately 45 degrees. Think of being on your hip pocket, not your back.
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Shallow underhook with elbow position too low below the armpit
- Consequence: Opponent easily controls your underhook with crossface, no lifting power for sweep, vulnerable to being flattened
- Correction: Drive your underhook deep with your hand reaching to their far hip. Your elbow should be high, at or above their armpit level, creating maximum lifting leverage beneath their center of gravity.
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Pulling opponent’s far leg too early before creating proper angle and position
- Consequence: Telegraphs the sweep direction, opponent adjusts base preemptively, sweep fails before you can generate momentum
- Correction: Establish angle and position first, then grip the leg. The leg pull and bridge must happen simultaneously as one explosive movement, not as separate sequential actions.
Playing as Defender
Key Principles
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Win the underhook battle proactively through crossface pressure and shoulder drive before the bottom player can establish the grip
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Flatten the bottom player to their back using crossface and chest-to-chest pressure to eliminate their angle and mechanical advantage
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Maintain wide base with far leg posted out to preserve balance when sweep is initiated and provide recovery platform
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Apply whizzer control immediately when underhook is established to neutralize the lifting leverage and redirect their force
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Keep hips low and heavy to prevent the bottom player’s bridge from elevating your center of gravity past your base
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Never allow simultaneous underhook depth, angle, and far-base control - disrupting one element prevents the sweep entirely
Recognition Cues
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Bottom player’s inside arm drives deep under your armpit with hand reaching past your centerline toward your far hip or back
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Bottom player rotates to their side facing you, coming off their back to create approximately 45-degree hip angle to the mat
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Bottom player’s outside hand reaches across to grip your far leg behind the knee or control your far posting arm
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Bottom player’s head drives tight into your chest or shoulder, preventing you from establishing crossface
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Sudden explosive bridging motion directed upward and forward combined with pulling on your far-side base point
Defensive Options
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Establish crossface and flatten bottom player to their back before they secure underhook depth - When: Immediately when you feel bottom player beginning to fight for underhook - this is the highest-percentage defense when applied early
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Apply whizzer (overhook) on the underhook arm and drive it downward to the mat while sprawling hips back - When: When the bottom player has already secured a deep underhook and you cannot prevent it - the whizzer must be applied immediately before they establish angle
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Post far leg wide and lower your base when you feel the bridge and sweep initiation - When: During the sweep execution when you feel their bridge beginning to elevate you - this is the emergency defense when earlier prevention failed
Position Integration
The underhook sweep is a cornerstone technique of modern half guard bottom game, serving as the primary offensive threat that defines half guard strategy. It integrates seamlessly with the entire spectrum of half guard variations - from traditional half guard to deep half, knee shield, lockdown, and Z-guard positions. The threat of the underhook sweep forces opponents into defensive reactions that open pathways to other attacks: their wide base creates old school sweep opportunities, their whizzer creates back-take entries through the dogfight position, their backward weight shift allows butterfly guard transitions, and their forward pressure facilitates deep half guard entries. This technique connects to broader positional concepts throughout Brazilian Jiu-Jitsu - it teaches proper angle creation, base removal, and the use of opponent momentum principles that apply from white belt fundamentals through black belt competition strategy. Understanding this sweep is essential for both playing bottom half guard offensively and defending against it when passing.