Butterfly Guard

What This Is

Butterfly guard is the open guard configuration in which both of the bottom player’s hooks are placed inside the top player’s thighs, with the feet resting against the inner thigh and hip area. The bottom player sits upright — or slightly off-angle — and maintains an underhook on one side. The hooks and the underhook work together: the hook provides the elevation lever, and the underhook controls which direction the sweep goes.

Butterfly guard is primarily an offensive guard. Unlike closed guard, which pins the top player to the bottom player, butterfly guard requires the bottom player to continuously pursue the top player’s posture. A top player who is allowed to sit back, flatten their base, and keep their weight low is difficult to sweep from butterfly. The position works by closing the distance — the bottom player’s hips must be close to the top player’s hips, the underhook must be deep, and the hook must be underneath the weight, not in front of it.

This is the central sweep hub in no-gi guard. The basic hook sweep, the sumi gaeshi, and the arm drag to back all emerge directly from this configuration. Butterfly guard also serves as the primary entry to X-guard when the top player stands, and to leg entanglement positions via hook elevation into single leg X.

The Invariable in Action

In butterfly guard, the foot line takes a specific form: the hooks must be inside the thighs, not on the outside. An outside hook — where the foot rests against the outside of the thigh — has no sweeping leverage. The inside hook position keeps the feet between the opponent’s knees in both a literal and mechanical sense. When the hooks are lost — either stripped to the outside or removed entirely — the top player can sit heavy, flatten the bottom player, and pass. Hook maintenance is the first defensive obligation.

The underhook is the primary elbow connection in butterfly guard. It gives the bottom player control over the top player’s shoulder and, through it, the hip on that side. The over-under configuration — bottom player has underhook on one side, the top player has underhook on the other — is the central contest of the position. When the bottom player wins the underhook battle, the sweep becomes available. When the top player wins both underhooks and flattens the bottom player’s shoulder to the mat, the guard is in serious danger.

This invariable describes exactly what butterfly guard sweeps accomplish. The hook elevation drives the top player’s weight forward, their hand posts to the mat, and the sweep completes to top position. The moment a hand posts is the moment a sweep is happening — the sweep is not an action that follows the hand post, it is the mechanical cause of it. The bottom player’s job is to generate the elevation that makes the hand post inevitable.

Hip elevation is the mechanical output of butterfly guard. The sweep does not work by pushing — it works by lifting. The hook foot drives up under the thigh, the bottom player’s hips rise, and the top player is taken off their base. This requires the bottom player’s hips to be free to move. A bottom player who is flat on their back cannot elevate. The top player’s primary passing strategy — flattening the bottom player — is a direct attack on INV-G05. Sitting up against the top player’s flattening pressure is the defence.

Sweep direction in butterfly guard is determined entirely by underhook position. When the bottom player has the left underhook, the sweep goes to the right — the bottom player drives the top player over their left shoulder by elevating the left hook and pulling the top player’s right hip with the underhook connection. Attempting to sweep in the opposite direction against a winning underhook is inefficient. When the underhook is lost, the correct response is either to fight to recover it or to switch to the arm drag (which uses the over-hook situation) before sweeping.

Inside position is the mechanical prerequisite for butterfly guard to function. The hook foot must be inside the thigh, not resting against the outside of the knee — an outside hook cannot generate the lift that elevates the opponent’s base. When the top player strips a hook to the outside, they are not merely removing a foot from position; they are removing the inside position that makes the entire sweeping structure available. Recovering inside hook position before sweeping is not optional — it is the condition the sweep requires.

Butterfly guard requires the bottom player to sit up and face the top player — the sit-up posture is itself a manifestation of INV-G02. A bottom player who looks away or turns their shoulders loses the ability to time the underhook fight and cannot read which direction the top player is loading their weight. The sweep opportunity in butterfly guard is brief: the bottom player must detect the weight shift and commit to the elevation in the same moment. A player who is not facing the top player cannot detect it.

Entering This Position

From Seated Guard

The most common and natural entry. As the top player advances into the bottom player’s space — particularly when they kneel — the bottom player inserts both hooks into the inner thighs. The hook insertion happens as the top player closes the distance: if the bottom player waits until the top player is already in heavy, the opportunity has passed. The hooks go in before the top player’s weight settles. From here, the underhook fight begins.

From Closed Guard (Bottom) — Opening to Butterfly

When closed guard is not producing results or the top player has achieved a stable passing posture, the bottom player can release the closed guard legs, insert butterfly hooks, and transition to the butterfly configuration. This is typically done when the top player has stood up inside closed guard — planting the hook feet on the inside of the standing opponent’s thighs and converting to a butterfly-like frame. Full butterfly hooks are then available as the top player re-kneels.

From Half Guard — Half Butterfly Insertion

Half guard with one butterfly hook is sometimes called “half butterfly.” When the bottom player is in half guard and has the top-side hook inside the trapped leg’s inner thigh, they can work to recover the second hook on the free side and transition to full butterfly guard. This is an important recovery route from half guard when the top player is preventing the standard half guard underhook sequence.

From This Position

Butterfly guard is a sweep and transition hub. The primary attacks from this position are sweeps; submissions are typically available as combinations off those sweeps rather than primary threats.

Sweeps and Attacks

The three primary sweeps from butterfly guard are described here conceptually. Each has a dedicated page linked below.

Basic hook sweep (SWP-BUT-HOOK): The foundation sweep. Bottom player has the underhook. The hook foot drives up under the thigh on the underhook side. The underhook arm simultaneously lifts and rotates the top player’s shoulder. The top player is elevated and tipped to the side — they post a hand, the bottom player continues the rotation, and they arrive in top position. The sweep happens when both the hook and the underhook work together. Either alone is insufficient.

Sumi gaeshi (SWP-BUT-SUMI): Available when the top player has a collar tie or the bottom player can close a pinch headlock. The bottom player falls to their back while the hook foot drives up and forward, projecting the top player overhead. There are two common variants — the pinch headlock sumi and the shoulder crunch entry. Both use the same mechanical output: hook elevation converts the top player’s weight into forward momentum.

Arm drag to back (SWP-BUT-ARMDRAG): When the underhook fight is not winnable — or when the top player reaches with an arm — the bottom player redirects that arm across the body and rotates to take the back. The arm drag from butterfly guard is particularly effective because the hook on the drag side provides elevation assistance: as the bottom player pulls the arm across, the hook lifts the hip on that side, making the back take easier to complete.

Transitions

To X-guard: When the top player stands up from butterfly guard — particularly when they stand over one of the bottom player’s hooks — the bottom player can scoop under the standing thigh and transition to X-guard. The hook that was inside the thigh becomes the lower hook in X-guard; the other leg comes in as the upper hook. This transition is the most common entry to X-guard.

To half guard: When the top player passes one butterfly hook and begins advancing, the bottom player can concede one side and establish half guard with the remaining leg connection. Half butterfly — one hook in — is the natural position between the two. From half butterfly, the half guard underhook fight begins.

Submission Threats

Butterfly guard’s primary submissions are opportunity-based rather than positional. A triangle (SUB-TRI-STD) becomes available when the top player’s arm is trapped inside during a sweep attempt and the bottom player can close the legs around the neck and arm. An armbar (SUB-ARM-ARMBAR) is accessible in the same scenario. A kimura (SUB-KIM-KIMURA) is available when the top player posts a hand to prevent the sweep — the posted arm is vulnerable. Guillotines (SUB-FHL-GUILLOTINE) present when the top player ducks their head to defend the underhook. These are combinations, not set-piece attacks — they emerge from the sweep sequence.

Hook elevation also creates the entry to leg entanglements: driving a hook up under the hip while controlling the foot creates the SLX entry (POS-LE-ASHI), particularly when the top player stands or posts a leg forward.

Common Errors — and Why They Fail

Error: Leaning back instead of sitting up against pressure. Why it fails: This violates INV-G05. When the top player drives forward, the passive bottom player falls back — the hips flatten, hook elevation becomes impossible, and the top player’s weight pins the bottom player to the mat. A flattened butterfly guard is a guard already being passed. Correction: Meet forward pressure by sitting into it, not by yielding to it. The bottom player’s spine should remain roughly upright. The underhook arm drives the top player’s shoulder back as the bottom player maintains the sit-up posture.

Error: Hooks on the outside of the thighs. Why it fails: Outside hooks have no sweeping leverage. The foot cannot drive the hip upward from the outside because the force vector is wrong. The top player can simply sit back and nullify both hooks. Correction: The hook foot must be on the inside of the thigh, close to the groin. If the top player strips the hooks to the outside, re-insert them before attempting any sweep.

Error: Attempting to sweep against the underhook. Why it fails: This violates INV-11. Sweeping in the direction where the top player has the underhook means sweeping into their base — they simply post and the sweep stalls. Correction: Either fight to recover the underhook before sweeping, or use the arm drag in the over-hook direction. Sweep to the side where the underhook is won.

Error: Pulling the top player by the arm without hook elevation. Why it fails: The arm drag without hook elevation on the drag side is easily countered — the top player just steps back and shrugs. The hook elevation creates the physical off-balance that makes the drag irreversible. Correction: The hook elevates as the arm is dragged. Both happen simultaneously. The elevation tips the hip on the drag side, and the drag rotates the shoulder — together they break the top player’s base.

Drilling Notes

Ecological Approach

Underhook game: Both players start in the butterfly position — bottom player has both hooks in, neither player has the underhook yet. The game starts on a signal. Bottom player scores by completing a sweep or taking the back. Top player scores by flattening the bottom player’s shoulders to the mat or advancing to side control. No submissions. Run for ninety seconds, switch roles, repeat. This game isolates the underhook contest and forces the bottom player to develop timing on the sweep rather than the setup.

Systematic Approach

Phase 1 — Hook insertion only. Top player kneels passively. Bottom player drills inserting both hooks from seated guard ten times. Invariable checkpoint: are both hooks inside the thighs with the bottom player sitting up? (INV-G01, INV-G05)

Phase 2 — Basic hook sweep, cooperative. Both players cooperate on the basic hook sweep. Bottom player gets underhook, drives hook, sweeps. Top player assists by leaning in the sweep direction. Focus is on the mechanics — hook drives up under the thigh, underhook arm lifts and rotates, bottom player rises to top position. Drill twenty repetitions each side.

Phase 3 — Basic hook sweep with underhook resistance. Top player fights for the underhook but does not attempt to pass. Bottom player must win the underhook before sweeping. This adds the critical underhook contest to the technical sequence.

Phase 4 — Underhook game (ecological), as above.

Ability Level Guidance

Half Guard Note

Half guard is butterfly guard with one side already conceded. When the top player has cleared one of the butterfly hooks and is working to pass, the bottom player is in half guard — one leg controlling one of the top player’s legs, the butterfly hook on that side still active or recently lost. The mechanical principles are identical to full butterfly guard, but the margin for error is significantly reduced.

In half butterfly (one hook in), the bottom player must win the underhook on the remaining active side before the top player can flatten them. The remaining hook is the last lever available — if it is stripped, the bottom player is in a fully flat half guard without a hook, which is a defensive position rather than an offensive one. The half guard underhook battle is more urgent than the full butterfly underhook battle because there is no second hook to fall back on.

The recovery path from half butterfly back to full butterfly guard is to re-insert the second hook when the top player creates space — usually when they posture up to try to pass. This creates the window to sit up, insert the free hook, and return to the full position.

Also Known As

Related Pages

Concepts layer