Half Butterfly Pass

What This Is

The half butterfly pass defeats the half butterfly guard — a hybrid position where one of the bottom player’s legs traps the top player’s near leg in half guard while the free leg inserts a butterfly hook inside the top player’s near thigh. The butterfly hook recovers sweep ability that standard half guard lacks — it elevates the top player’s hips, creates off-balance, and threatens sweeps that flat half guard cannot produce.

The passing challenge is that the top player faces two control mechanisms simultaneously: the half guard leg trap locks the near leg in place, and the butterfly hook lifts and redirects from below. Standard half guard passing addresses the trap but not the hook; standard butterfly passing addresses the hook but not the trap. The half butterfly pass must deal with both, and the sequencing matters — addressing them in the wrong order opens the other threat.

The butterfly hook is the higher-priority target. A live butterfly hook can sweep the top player even while the half guard trap holds the leg. The trap alone (without the hook) is standard half guard — far more manageable. Kill the hook first, then pass the remaining half guard.

The Invariable in Action

The half butterfly operates two foot-line mechanisms: the half guard trap (passive — it holds the leg) and the butterfly hook (active — it lifts and redirects). The pass must neutralise the active foot line first. Once the butterfly hook is killed, the remaining position is standard half guard with a passive leg trap, which existing half guard passing handles.

The half butterfly sweep combines the hook lift with hip rotation. Pinning the bottom player’s hips eliminates the rotation, which kills the sweep. The flattening action — crossface, shoulder pressure, or hip compression — removes the engine that makes the hook dangerous. The hook remains, but without hip rotation it cannot lift.

The hook sits inside the top player’s thigh. Trying to strip it by pushing the hooking leg away with the hands or knees is fighting the hook’s mechanical advantage — the bottom player’s hamstring is stronger than the top player’s pushing force in that position. The correct response is structural: drop weight onto the bottom player’s thigh, compressing the hook to the mat. The hook is present but inert — it cannot generate lift under structural weight.

The Hybrid Problem

Half butterfly combines half guard’s leg trap with butterfly’s hook lift. This creates a specific sequencing challenge for the passer.

Why Kill the Hook First

If the passer addresses the half guard trap first — extracting the near leg — the butterfly hook is still live. The bottom player can immediately convert to full butterfly guard with the freed leg as a second hook, and the passer is now facing full butterfly guard from a worse position than they started. Extracting the trapped leg without killing the hook is a common error that makes the position harder, not easier.

Why the Trap Is Secondary

The half guard trap (without the hook) is standard half guard — a position with well-documented passing options. Once the hook is killed, the passer is in familiar territory. Kill the hook → pass the remaining half guard. This two-step sequence avoids the full-butterfly-conversion error.

The Underhook Factor

Half butterfly is most dangerous when the bottom player has the near-side underhook. The underhook plus the hook creates the sweep vector: the hook lifts while the underhook pulls. Denying the underhook via crossface or whizzer removes half of the sweep’s force, making the hook easier to kill. In many cases, winning the underhook battle is the pass.

Pass Methods

Crossface Flatten and Hook Kill — Primary Method

Drive a heavy crossface — forearm or shoulder across the bottom player’s jaw — to flatten them from the side position onto their back. With the bottom player flat, drive the near-side knee into the inside of the hooking leg’s thigh, compressing it to the mat. The crossface removes the hip rotation; the knee compression removes the hook’s lift. With both neutralised, pass the remaining half guard via knee cut, smash, or split squat. The crossface and knee compression happen simultaneously — not sequentially — to deny the sweep before the hook kill completes.

Body Lock Compression

Wrap both arms around the bottom player’s torso or hips in a body lock. Chest to chest, weight dropped low. The body lock compresses the bottom player’s hips toward the mat, removing the rotation that powers the butterfly hook sweep. With the body lock tight, the hook is present but cannot lift. Walk the hips to the passing side — the body lock carries the top player past the hook without needing to strip it. Finish to side control. This method bypasses the hook entirely through compression rather than neutralisation.

Knee Pin to Hook Side

Drive the near-side knee into the hip crease on the hook side — the crease where the bottom player’s thigh meets the pelvis. This pins the hooking leg’s hip to the mat, removing the elevation base for the butterfly hook. With the hip pinned, the hook cannot generate upward force. From the knee pin position, extract the trapped near leg using standard half guard passing — the hook is no longer a threat, so the trap can be addressed safely.

Whizzer and Sprawl

When the bottom player has the underhook, counter with a whizzer on the underhooking arm. Sprawl the hips back and down, driving weight through the whizzer into the bottom player’s shoulder. The sprawl-whizzer combination flattens the bottom player and denies the underhook that powers the sweep. From the sprawl, the hook is underneath but the bottom player is flat — the hook has no rotational support. Drive the knee inward to compress the hook to the mat and pass.

Guard Responses

Hook sweep as you settle weight: The bottom player hits the butterfly hook sweep before the weight commit completes — elevating the hip and rolling the top player to the hook side. Counter: drop weight fast. The sweep requires a moment of elevation; an immediate weight commit closes the elevation window before the sweep loads.

K-guard transition: The bottom player converts the butterfly hook forward into a K-guard entry — the hook becomes the inside hook, and the far leg catches the outside of the near leg. Counter: recognise the knee going inward and past. The moment the hook begins converting forward, step the near leg back to deny the K-guard entry angle.

Arm drag to back take: The bottom player grabs the crossfacing arm and drags it across the centreline, opening an angle for back exposure. Counter: keep the crossfacing elbow tight to the body. An arm drag requires the elbow to be extended away from the body — a tight elbow denies the drag’s leverage.

Single-leg-X entry as you disengage: The bottom player shoots the hooking leg forward into a single-leg-X position as the top player creates distance. Counter: do not create distance. Stay compressed. SLX requires the top player to be at range — compression denies the range the entry needs.

Dogfight entry with underhook: The bottom player uses the underhook to rise to the knees, entering the dogfight. Counter: the crossface or whizzer must be in place before the bottom player rises. The dogfight is a standing scramble — preventing the rise prevents the scramble.

Common Errors

Drilling Notes

Developing Drill

Partner establishes half butterfly with hook and underhook, passive resistance. Top player drills the crossface flatten plus knee compression — ten reps. Focus: can the bottom player still lift with the hook after the knee compression? If yes, the compression angle is wrong.

Proficient Drill

Partner in half butterfly with live sweeps and transitions. Top player must kill the hook and pass within thirty seconds. Ten rounds. Score: hook killed and pass initiated = win; sweep, K-guard entry, or SLX entry = loss. This drills the urgency — the half butterfly converts quickly if left unaddressed.

Advanced Drill

Full live rounds starting in half guard. Bottom player transitions to half butterfly at will. Top player must recognise the hook insertion and address it before the sweep loads. Three-minute rounds. This drills transition recognition — the hook insertion is the critical moment, and early recognition makes the pass straightforward.

Ability Level Guidance

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