HALF-BUTTERFLY GUARD

Half-butterfly guard is the hybrid open-guard configuration in which the bottom player has one butterfly hook (foot hooked under the opponent's thigh) while the other leg is in a half-guard, knee-shield, or extended frame position. The position is one of the most versatile modern open-guard variants and produces a distinctive set of sweeps and transitions that neither pure butterfly nor pure half-guard can access alone.

The mechanics involve the bottom player having one foot hooked under the opponent's thigh in the butterfly configuration while the other leg is in a different role — typically half-guard with the opponent's leg trapped, or knee-shield with the same-side knee positioned across the opponent's torso. The bottom player's hands typically grip the opponent's far-side arm or collar/gi for upper-body connection. The position is structurally flexible — the bottom player can convert to full butterfly (by retrieving the second hook), to deep half-guard (by inverting the trapped leg), or to single-leg-X (by extending the butterfly leg).

The half-butterfly has been used extensively by competitors who specialize in hybrid open-guard systems. Notable practitioners include Bernardo Faria, Tom DeBlass, and various modern half-guard specialists. The position is particularly effective as a transitional configuration during open-guard scrambles because the bottom player can convert to multiple guard configurations depending on the opponent's reactions. Defensively the half-butterfly is countered by maintaining strong posture against the butterfly hook (don't lean over), by passing on the half-guard side rather than the butterfly side, or by hand-fighting the upper-body grips before they consolidate.