Scorpion / Lower Leg Shift

What This Is

Scorpion — also called the lower leg shift or leg lace half guard — is a half guard variant in which the trapping leg has moved from the inside of the top player’s thighs to the outside. In standard half guard, the bottom player’s feet are clasped or crossed between the top player’s legs, trapping the near leg from inside. In scorpion, the bottom player has repositioned the lower trapping leg so that the foot now hooks over the outside of the top player’s near knee. The leg is no longer between the thighs — it is wrapped around the outside of the near knee, controlling the leg from a different angle.

This change in leg position changes the available sweep geometry. In standard half guard, the bottom player needs the underhook to generate forward sweep force. In scorpion, the outside knee hook creates a pulling mechanism that does not require the same underhook leverage — the bottom player can attack the base of the top player by pulling the heel while extending the hips. This creates a sweep that attacks from the outside rather than through the top player’s centre.

Scorpion is a half guard variant and uses the same invariable framework as standard half guard. The concession on the foot line is identical — one leg is trapped, one side of the foot and knee line is already given up. The same principles govern hip mobility, underhook significance, and frame mechanics. The lower leg shift changes the physical position of one leg, not the underlying logic of the position.

The most important strategic element in scorpion is the dilemma it creates for the top player. The bottom player can attack the sweep (pulling the heel outward, extending the hips) or the back take (using the underhook when the top player defends the sweep). These two threats are mutually supportive: defending one opens the other. Against a top player who does not understand the position, the sweep often works immediately. Against a top player who understands it, the back take becomes available.

The Invariable in Action

In scorpion, the foot line is controlled from outside the knee rather than from inside the thighs. The bottom foot’s hook on the outside of the top player’s near knee controls the leg laterally — the top player cannot step that leg outward freely. If the bottom foot loses the hook on the outside of the knee, the top player can extract the leg and pass. The foot must maintain the outside knee hook continuously. This is the primary physical action of the scorpion position — everything else depends on it.

Hip mobility in scorpion is essential for both the sweep and the transition to waiter. The scorpion sweep is generated by hip extension — the bottom player drives the hips away from the top player while pulling the outside knee hook inward. This requires the hips to be mobile and elevated off the mat. A bottom player lying flat in scorpion has no hip extension available and cannot generate the sweep force. Hip mobility must be maintained throughout. As in standard half guard, being flattened eliminates the offensive options and reduces scorpion to a holding position the top player can work through.

The underhook remains central in scorpion. The outside knee hook attacks the base from below; the underhook attacks the hip from the upper body. Together, they create a coordinated attack on the top player’s structure. On its own, the outside knee hook is a good base disruption but can be absorbed by a wide-based top player. Combined with the underhook, the bottom player is attacking the near hip from two directions simultaneously — the top player has no good base response. The underhook also determines the back take route: when the top player dips their head and shoulder to defend the sweep, the underhook side is the direction the back take opens.

Scorpion sweeps and back takes both work by timing the attack to the top player’s movement or reaction. The sweep works best when the top player’s weight is over the near leg — when they are driving downward — not when they are sitting back. The back take works when the top player drives their upper body down to stuff the sweep, not when they are upright. Attempting the sweep against a perfectly balanced, upright top player requires forcing the movement; timing it to the top player’s forward pressure converts their energy into the sweep.

Entering This Position

From Half Guard — Lower Leg Shift

The standard entry. The bottom player is in half guard with both legs trapping the top player’s near leg from inside. To enter scorpion, the bottom player uncrosses the ankles and repositions the lower leg — shifting the foot from between the top player’s thighs to outside the near knee. The foot hooks over the top of the knee on the outside, with the shin running along the outside of the top player’s near leg. The upper leg maintains connection to the inside of the top player’s thigh during the transition to keep control throughout the shift.

The shift is most easily performed when the bottom player is already on their side — hip mobility is needed to reposition the lower leg. From flat, the shift is harder to execute because the hips cannot rotate to create the angle for the lower leg to swing out. Establish side position in half guard first, then perform the lower leg shift.

From Z-Guard — Knee Shield Drop to Outside

When the bottom player is in Z-guard (knee shield up) and the top player passes the knee shield by pushing it outward and down, the bottom player can convert the dropping knee into an outside hook by continuing the leg motion around the outside of the top player’s knee. Rather than losing the position as the knee shield drops, the bottom player converts the momentum of the drop into the scorpion configuration.

From This Position

Scorpion Sweep

The primary sweep. With the outside knee hook established and the underhook on the near side, the bottom player pulls the outside knee hook inward (toward their own body) while extending the hips outward (driving the hips away from the top player). This creates a scissoring action that collapses the top player’s near leg inward and takes their base. The top player falls to the far side. The extension of the hips is the power source — pulling the hook alone is not enough. The hip drive and the hook pull must work simultaneously.

The sweep works best when the top player’s weight is forward over the near knee. If the top player is sitting back and wide, the outside hook has less mechanical advantage. Creating a threat with the underhook — reaching for the back or pulling on the far shoulder — forces the top player’s weight forward and onto the near knee, setting up the sweep.

Back Take — Upper Body Commitment Opens the Route

When the top player defends the scorpion sweep by dropping their head and shoulder (ducking under to stuff the sweep), the underhook side opens for the back take. The bottom player releases the sweep attempt and comes up on the underhook side, reaching the far arm over the top player’s back for the seatbelt. The top player, committed to the sweep defence, cannot recover their posture in time. This is the back take that makes the scorpion sweep dangerous — the top player must defend both simultaneously, and over-committing to either defence opens the other.

Waiter Position Transition

When the outside knee hook is tight and the bottom player’s shin is laced around the top player’s leg, releasing the upper body control and driving the shin down along the outside of the leg creates the waiter position. In the waiter, the bottom player attacks the far leg rather than the near leg, creating a different sweep and leg lock threat. The transition from scorpion to waiter is especially effective when the top player has managed to clear the underhook — the bottom player releases and transitions rather than continuing to fight the underhook battle from an unfavourable position.

Knee Slip Counter — Kneebar Entry

When the top player attempts to slip their knee through the outside hook — pulling the knee backward through the leg lace — the motion of their knee creates a kneebar entry (SUB-LE-KNEEBAR) if the bottom player follows the knee with their body rather than releasing the hook. This is a counter to a specific escape attempt and should be understood as an available response rather than a proactive attack.

Common Errors — and Why They Fail

Error: Performing the lower leg shift from a flat position. Why it fails: INV-G05. The hip rotation needed to swing the lower leg from inside to outside the knee requires the hips to be mobile and elevated. From flat, there is no rotation available and the shift becomes a slow, telegraphed movement. Correction: Come to the side first. Hip escape to create the side position, then perform the lower leg shift from there.

Error: Attempting the scorpion sweep without the underhook. Why it fails: INV-11. The outside knee hook alone attacks the base from below but a wide-based top player can absorb it. The underhook applies upper body pressure on the near hip simultaneously. Without both, the sweep can be defended by the top player adjusting their base. Correction: Establish the underhook before initiating the sweep. If the underhook is contested, use the sweep threat to force the top player to deal with the lower body and win the underhook in the resulting movement.

Error: Pulling the outside hook without hip extension. Why it fails: The sweep is generated by hip extension — the hips driving away — while the hook pulls. Pulling the hook alone without extending the hips provides only arm strength against the top player’s entire lower body. It is easily absorbed or stripped. Correction: The hip drive is the power source. The arm pulling the hook is the direction mechanism. Both must operate together. Focus on the hip extension as the primary movement; the hook pull guides where the force goes.

Error: Ignoring the back take threat in favour of repeatedly attempting the sweep. Why it fails: INV-13 and the dilemma logic. The scorpion sweep works because the back take is also available. A bottom player who only attempts the sweep and ignores the back take allows the top player to over-commit to sweep defence without consequences. Correction: When the top player dips to defend the sweep, take the back immediately. The back take is not secondary — it is the other half of the dilemma. The position only works fully when both threats are real.

Drilling Notes

Ecological Approach

Scorpion dilemma game: Bottom player starts in scorpion position with the outside knee hook established and the underhook in place. Top player attempts to pass or base out. Bottom player scores a point by completing the sweep. Bottom player scores a second type of point by taking the back. Top player scores by completing the pass. No submissions. Run for ninety seconds, switch roles. This game forces the bottom player to read which exit is opening rather than committing to one threat.

Systematic Approach

Phase 1 — Lower leg shift mechanics. Top player in half guard, applying light pressure. Bottom player drills the transition from standard half guard (inside leg trap) to scorpion (outside knee hook). Checkpoint: is the foot on the outside of the knee? Is the shin running along the outside of the top player’s leg? Is the hip mobile and elevated? Twenty repetitions.

Phase 2 — Sweep mechanics. Top player in scorpion position statically. Bottom player drills the sweep mechanics: outside hook pull plus hip extension. Focus specifically on whether the hip extension is occurring — is the bottom player’s hip driving away from the top player? Or is it just an arm pull? Fifteen repetitions with a partner who gives feedback.

Phase 3 — Dilemma drill. Top player is instructed to either dip the head and shoulder (defending the sweep) or to base wide (defending the back take), at random. Bottom player reads the response and attacks accordingly — sweep on the wide base, back take on the dipped shoulder. No pre-set sequence. This drill develops reading ability. Fifteen repetitions each.

Phase 4 — Scorpion dilemma game (ecological), as above.

Ability Level Guidance

Also Known As

Related Pages