Why is Half Guard to Kimura Trap authored as a transition rather than a submission?

Because its success outcome establishes a position — Kimura Trap/Bottom — rather than reaching the game-over sink. A move whose success edge reaches game-over is a submission and is authored as one; this one's success edge reaches a position, so it is a transition.

What must be true about your hips before you thread the arm?

You must be on your side with the inside hip elevated and your shoulders stacked vertically. From a flat back there is no gap under the opponent's chest to thread through and no shoulder leverage to rotate with.

Which three opponent actions expose the arm for this entry?

Posting a hand on the mat to base, reaching across for the crossface, and driving an underhook deep during a pass attempt. All three extend the arm away from the ribs and expose the tricep to the thread.

Why does the half guard leg entanglement have to stay live during the entry?

The grip only converts into control because the legs stop the opponent standing up or stepping away to pull the arm free. Release the entanglement and you hold a grip on someone who can simply disengage from it.

Where on the arm should the closed figure four sit, and why?

As close to the opponent's elbow as the arm allows. A grip at the wrist end leaves a long lever that the shoulder can rotate free against, so the trap never consolidates.

What is the cost of a failed entry, and what does that imply?

You return to half guard bottom having spent only grip effort, so the attack is low-risk and repeatable. The real cost only appears if you keep the arm committed while the opponent clears the entangled leg, which concedes the pass.

Half Guard to Kimura Trap Attacker | BJJ Technique Guide

As the attacker you are on the bottom of half guard, and your job is to trade a moment of arm commitment for a grip that outlasts the position. Stay on your side with the inside hip off the mat: flat on your back the thread has no room and your shoulder has no leverage. Wait for the arm — do not chase it. The top player will post to base, reach for the crossface, or extend during a pass, and any of the three exposes the tricep. Thread, grip your own wrist, and close the figure four before you think about where you are going with it. The grip is the position; everything after is a choice.

From Position: Half Guard (Bottom)

Key Attacking Principles

What are the key principles for executing Half Guard to Kimura Trap?

The grip is the objective — do not trade it for a sweep or a finish before it is closed and deep
Stay on your side with the inside hip elevated; a flattened hip removes both the thread space and the shoulder leverage
Take the arm the opponent gives you rather than hunting a specific one — post, crossface and underhook all expose the tricep
Keep the half guard leg entanglement live throughout; the grip only controls because the legs prevent disengagement
Close the figure four as close to the opponent’s elbow as the arm allows — a wrist-end grip gives the shoulder room to rotate free
Treat a failed entry as free: you return to half guard having spent only grip effort, so the attack is repeatable

Prerequisites

What do you need before attempting Half Guard to Kimura Trap?

Half guard established with the opponent’s near leg entangled and controlled
Bottom player on their side, inside hip elevated, head off the mat
The opponent’s near arm posted, reaching, or otherwise extended away from their ribs
Free hand available to meet the threading arm and close the figure four

Execution Steps

How do you execute Half Guard to Kimura Trap step by step?

Establish the side position: Shrimp onto your inside hip so your shoulders are stacked vertically rather than flat. This creates the gap under the opponent’s chest that the threading arm needs and puts your shoulder in a position to generate rotation.
Anchor the legs: Confirm the half guard entanglement on the opponent’s near leg, adding the lockdown if their base is strong. The legs are what convert a grip into control by removing the option to stand and pull free.
Wait for the arm to commit: Let the opponent post to base, reach for the crossface, or drive an underhook. Do not reach for an arm that is still tight to their ribs — a premature thread gives them your back and costs you the underhook battle.
Thread the inside arm: Drive your inside arm under the exposed tricep and up along the far side of their arm, palm turning toward their back. Keep the elbow tight to your own body as it travels so the arm does not get flattened out.
Close the figure four: Meet the threading hand with your free hand, grip your own wrist, and close the loop over the top of their arm. Slide the whole grip toward their elbow to shorten the lever they can rotate against.
Consolidate the trap: Pull the captured arm across their centreline or toward their back to load the shoulder, and re-settle your hips underneath. You are now in Kimura Trap Bottom with the grip established and the finish, the sweep and the back take all available as separate decisions.

Possible Outcomes

Result	Position	Probability
Success	Kimura Trap	40%
Failure	Half Guard	40%
Counter	Side Control	20%

Opponent Counters

How might your opponent counter Half Guard to Kimura Trap?

Hiding the arm — the top player keeps the elbow pinned to their ribs and refuses to post (Effectiveness: High) - Your Response: Attack their base instead: lockdown or off-balance them so they must post to stay upright, then take the arm they are forced to give. → Leads to Half Guard
Ripping the arm free before the figure four closes (Effectiveness: Medium) - Your Response: Close the loop earlier and higher on the arm, and keep your threading elbow tight so there is no straight line for them to extract along. → Leads to Half Guard
Passing the entangled leg while your arm is committed (Effectiveness: Medium) - Your Response: Abandon the thread the moment the leg is cleared and recover the knee shield; the grip is not worth the pass. → Leads to Side Control

Common Attacking Mistakes

What mistakes should you avoid when executing Half Guard to Kimura Trap?

1. Threading from a flat back

Consequence: No space under the opponent’s chest and no shoulder leverage, so the arm gets pinned and the underhook is lost.
Correction: Shrimp onto the inside hip first and confirm your shoulders are stacked before the arm moves.

2. Reaching for an arm that has not committed

Consequence: The opponent circles the arm free and takes the underhook you vacated, often ending in a pass.
Correction: Bait the commitment with a lockdown or an off-balance and take the arm only once it is posted or extended.

3. Gripping at the wrist end of the arm

Consequence: The lever is long, the shoulder rotates free easily, and the trap never consolidates.
Correction: Walk the closed figure four toward the elbow before you load the shoulder.

4. Releasing the leg entanglement to chase the grip

Consequence: The opponent stands or steps over, and the grip controls nothing because they can disengage.
Correction: Treat the legs as a prerequisite, not an afterthought — the entanglement stays live for the whole entry.

5. Going straight for the finish as the grip closes

Consequence: You surrender the positional consolidation and the opponent extracts during the rotation.
Correction: Establish the trap first. The finish is a separate decision made from an established position.

Training Progressions

How do you train Half Guard to Kimura Trap (Attacker)?

Isolation - The thread Partner posts a hand on the mat and holds still. Thread and close the figure four for reps until the path is automatic from both the knee shield and the flat half guard.

Positional - Reading the commitment Partner passes at 50% and may post, crossface or underhook. Take only the arm that commits; reset without threading if none does.

Resistance - Closing under pressure Partner actively hides the arm and defends the loop. Start in half guard bottom, win the grip or reset after thirty seconds.

Integration - Entry into the system From live half guard bottom rolling, enter the trap and consolidate only — no finish, no sweep — to train the positional discipline the entry depends on.

Safety Considerations

What are the safety concerns for Half Guard to Kimura Trap?

This is a control entry, not a submission, and no joint should be loaded during it. Closing the figure four captures the shoulder but must not rotate it: the finish is a separate, deliberate decision made from the established trap. Threading fast into a partner’s committed arm can hyperextend an elbow that is already straight, so build the grip progressively and never snap it closed.

Half Guard to Kimura Trap Attacker