As the attacker from half guard bottom, your objective is to identify arm exposure from the top player and convert it into a Kimura grip that establishes the Kimura Trap control system. This transition requires precise timing, proper body angle, and coordinated grip mechanics that transform your defensive half guard position into an offensive platform. The attack begins with recognizing when the top player’s arm becomes vulnerable—typically when they post for base, reach for crossface, or extend during passing attempts—and executing a rapid sequence of wrist control, arm threading, and figure-four grip establishment that captures their shoulder before they can retract. Success depends on maintaining your side angle, keeping the half guard leg entanglement as an anchor, and driving the captured arm across the opponent’s centerline to disrupt their base and enter the full Kimura Trap system.
From Position: Half Guard (Bottom)
Key Attacking Principles
- Time the grip entry when the top player’s arm is committed to posting, reaching, or passing—never chase a retracted arm
- Thread the inside arm deep under the opponent’s tricep near the elbow for maximum mechanical leverage
- Maintain your side angle with inside hip elevated throughout the grip establishment to enable effective arm threading
- Keep the half guard leg entanglement secure as your anchor preventing the top player from disengaging
- Drive the captured arm across the opponent’s centerline to disrupt their base and weight distribution
- Coordinate Kimura grip with hip movement to create unified off-balancing force rather than isolated arm pulls
Prerequisites
- Established half guard with secure leg entanglement on one of the top player’s legs
- Side position maintained with inside hip elevated off the mat, not flat on back
- Top player’s arm exposed through posting, reaching, or extending during guard engagement
- Inside arm free and positioned to thread under the opponent’s tricep without obstruction
- Outside hand available for initial wrist control to prevent arm retraction
Execution Steps
- Identify arm exposure from top player: Monitor the top player’s arm positioning while maintaining half guard. The primary window opens when they post their hand on the mat for base, reach across your body for crossface or underhook, or extend their arm during passing attempts. Stay on your side with your inside hip elevated to maintain the offensive angle required for arm threading.
- Secure initial wrist control with outside hand: Use your outside hand to grip the opponent’s exposed wrist with a firm C-grip, thumb wrapped around the wrist. This initial contact must be quick and decisive before they retract their arm. Pull their wrist slightly toward your centerline to begin disrupting their base and creating the angle needed for the arm thread.
- Thread inside arm deep under opponent’s tricep: Drive your inside arm under the opponent’s tricep from below, reaching as deep as possible toward their elbow joint. Your forearm should make contact with the back of their upper arm near the elbow, not near the wrist. A deep thread maximizes leverage for both control and subsequent submission mechanics from the Kimura Trap.
- Complete figure-four Kimura grip configuration: Your inside hand grabs your own outside wrist, completing the figure-four Kimura configuration. Lock the grip tight with elbows pulled close to your body. The completed grip should feel structurally reinforced by your body positioning and prevent the opponent from straightening their arm or pulling free through retraction.
- Drive trapped arm across opponent’s centerline: Using the Kimura grip as a lever, pull the opponent’s trapped arm across their body toward their far hip. This cross-body manipulation disrupts their base and weight distribution, forcing them to post with their free hand or risk being swept. Coordinate the arm pull with a hip bump to amplify the off-balancing force on the top player.
- Create hip angle and transition to Kimura Trap: Shrimp your hips to create an angle that positions your body optimally for the Kimura Trap configuration. Secure your legs in lockdown or maintain half guard entanglement to anchor the opponent while your upper body controls their trapped arm. From this angle, the full Kimura Trap system of sweeps, back takes, and submissions becomes available.
- Consolidate Kimura Trap control position: Maintain constant inward pressure with the grip while keeping hips active and mobile. Begin cycling through offensive options—threaten the Kimura submission by rotating their shoulder, set up the Old School Sweep by hooking their far ankle, or prepare for a back take by following their defensive turning. The Kimura Trap is established when you control their arm with the grip and anchor with your legs.
Possible Outcomes
| Result | Position | Probability |
|---|---|---|
| Success | Kimura Trap | 40% |
| Failure | Half Guard | 40% |
| Counter | Side Control | 20% |
Opponent Counters
- Opponent pulls arm back forcefully before figure-four is completed (Effectiveness: High) - Your Response: Maintain wrist control with your outside hand and follow the retracting arm by scooting your hips closer. If the arm is fully retracted, transition to underhook and continue half guard offense rather than chasing the grip. → Leads to Half Guard
- Opponent drives chest forward aggressively to flatten your hips and neutralize the angle (Effectiveness: Medium) - Your Response: Use their forward momentum to accelerate the arm thread and grip completion. Their forward drive brings their tricep closer to your inside hand. Once the grip locks, redirect their forward pressure into a rolling Kimura sweep. → Leads to Side Control
- Opponent executes a quick knee slice pass while your hands are committed to the Kimura grip (Effectiveness: High) - Your Response: Maintain the Kimura grip as your anchor even if they begin passing. The grip prevents them from consolidating side control because their arm is compromised. Use the grip to pull yourself back to half guard or initiate Kimura attacks from the new position. → Leads to Side Control
- Opponent circles their elbow inward and rotates arm to break the figure-four configuration (Effectiveness: Medium) - Your Response: Tighten the grip by pulling elbows closer to your body and increasing inward pressure. If they begin breaking the grip, switch to an overhook on the same arm and threaten sweeps from overhook half guard, maintaining offensive pressure. → Leads to Half Guard
Test Your Knowledge
Q1: What is the optimal timing window for establishing the Kimura grip from half guard bottom? A: The best timing occurs when the top player posts their hand on the mat for base, reaches across your body for crossface or underhook, or extends their arm during a passing attempt. These moments create arm exposure with the opponent’s weight committed in a direction that makes retraction difficult. Attempting the grip when the opponent has their elbows tight and weight settled results in significantly lower success.
Q2: Why must the inside arm thread deep near the opponent’s elbow rather than their wrist? A: Threading deep near the elbow provides substantially greater mechanical leverage for both controlling the shoulder joint and finishing the Kimura submission. A shallow grip near the wrist allows the opponent to straighten their arm and power out of the figure-four configuration through simple extension. The deep thread creates a shorter lever arm that requires less strength to maintain and generates more rotational force on the shoulder girdle.
Q3: Your opponent posts their far hand on the mat while you have half guard bottom - how do you initiate the Kimura entry? A: Secure their posted wrist with your outside hand using a quick C-grip before they retract. Immediately thread your inside arm deep under their tricep toward the elbow while pulling their wrist toward your centerline. Complete the figure-four by grabbing your own wrist. The posting hand is the most vulnerable target because their weight is committed forward through that arm, making retraction slow and giving you a larger entry window.
Q4: What is the critical hip position required before attempting the Kimura grip from half guard? A: You must be on your side with your inside hip elevated off the mat, creating an angle toward the opponent rather than lying flat on your back. This side position enables you to thread your inside arm under their tricep effectively and provides the hip mobility needed to drive the arm across their centerline. Attempting the Kimura while flat results in insufficient arm reach, weak grip leverage, and vulnerability to being smashed and passed.
Q5: How should you respond when the opponent begins pulling their arm back after you have secured the Kimura grip? A: Maintain the grip firmly with elbows tight to your body and immediately increase rotational pressure on their shoulder to make extraction uncomfortable. Simultaneously use your hips to bridge into them, driving their trapped arm further across their centerline. Their arm retraction attempt can be converted into a sweep opportunity by using their pulling momentum against their own base. Never chase their arm by extending your own arms, as this compromises your grip structure.
Q6: What grip configuration is essential for maximum control in the Kimura from half guard? A: The figure-four configuration requires your inside hand to grip your own outside wrist after threading deep under the opponent’s tricep near the elbow. Your outside hand maintains a C-grip on the opponent’s wrist with your thumb wrapped around for maximum control. Both elbows should be pulled tight to your body to create structural integrity. The grip functions as a closed chain where your body weight reinforces the lock rather than relying on grip strength alone.
Q7: Your opponent drives forward aggressively to flatten you after you secure initial wrist control - what do you do? A: Use their forward momentum to complete the Kimura grip faster by pulling their wrist toward your centerline as they drive. Their forward pressure actually assists the arm threading process by bringing their tricep closer to your inside hand. Once the figure-four is locked, their forward drive can be redirected into a rolling Kimura sweep where you use their committed weight to come on top. The key is to redirect their pressure through the Kimura system rather than fighting it.
Q8: What role does the half guard leg entanglement play during the Kimura grip establishment? A: The half guard leg entanglement serves as the critical anchor preventing the top player from disengaging and pulling away when you attack their arm. Without maintaining the leg entanglement, the top player can sprawl back, create distance, and extract their arm before the Kimura grip is consolidated. The trapped leg also limits their ability to change angle or circle to pass, keeping them in the plane where your arm attack is most effective.
Safety Considerations
The Kimura grip applies significant rotational force to the shoulder joint. Apply pressure gradually and with control during training, never jerking or explosively rotating the shoulder. Release immediately when your partner taps. Be aware that the transition itself can create sudden shoulder pressure if the grip locks unexpectedly tight. Communicate with your training partner about intensity levels and ensure they understand the tap signal before drilling this technique.