Butterfly Guard

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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.

INV-G01Invariant "The bottom player must maintain their feet between or at the line of the top player's knees. Losing this line allows the top player to advance without engaging the guard."

Why it works hereIn butterfly the foot line is the inside hook. Both feet must be inside the thighs against the inner thigh and hip — outside the knees, they offer no elevation lever and the top player can sit heavy without engaging anything. When a hook is stripped to the outside the foot line is functionally lost on that side, and the bottom player's first job is to recover the inside line before any sweep is attempted.

See full invariant page → 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.

INV-G03Invariant "Connections to the inside of the top player's elbows — or to the outside of the elbows — control the top player's weight distribution and passing options. Losing both connections simultaneously is the guard being passed."