SINGLE-LEG X

Single-leg X is the leg-entanglement position in which the bottom player captures one of the opponent's legs between their own in a figure-four configuration, with the inside foot hooked behind the knee and the outside foot pressed into the opponent's hip. The position is structurally a hybrid of x-guard and ashi garami — it has x-guard's sweep mechanics on the captured leg and ashi garami's leg-lock entries on the same leg. Marcelo Garcia used it extensively as a primary sweep and back-take position; the Danaher Death Squad rebuilt it as the centerpiece of their leg-attack system.

The defining feature of single-leg X is that the captured leg cannot step out, cannot rotate the hip effectively, and cannot apply downward pressure — and the bottom player's outside foot in the hip provides the additional control needed to off-balance the opponent toward the captured side. From this position the bottom player can sweep by standing up while lifting the captured leg, can take the back when the opponent walks over to escape, can attack the inside heel hook (no-gi, brown belt and above), can attack the kneebar, or can transition to x-guard for an alternate sweep angle.

Single-leg X is one of the few guards equally effective in gi and no-gi. In gi competition it is used as a sweep-and-back-take system; in no-gi competition (where heel hooks are legal at the appropriate belt level) it is used as a submission-grappling position with the back-take and the heel hook as the dual primary threats. The position is one of the most influential modern innovations in BJJ, comparable in impact to the berimbolo for the gi-era and the heel hook for the no-gi era.

Defensively single-leg X is escaped by sharp forward stepping with the captured leg (planting the foot before the bottom player can capitalize), by walking laterally toward the bottom player's head, or by hand-fighting to strip the outside-foot's hip-press position.