Sickle Sweep
The sickle sweep hooks the bottom player's leg behind the standing opponent's far ankle in a scything motion, pulling the ankle out while pushing the…
Adapted from InGrappling, Sickle Sweep. System Games did not invent this curriculum.
Manage injuries →Position map Connects to 2 positions across 2 relationshipsOpen in the map →12←Enters from
The sickle sweep is a seated-guard sweep in which the bottom player hooks one leg behind the standing opponent’s near or far ankle and pulls it in a scything arc — like a sickle cutting through grass — while simultaneously pushing or pulling the opponent’s upper body in the opposite direction. The two forces (ankle pulled in one direction, torso pushed in the other) create a rotational imbalance that tips the opponent over their own foot.
The sweep is executed from a seated or lying guard position against a standing opponent. The bottom player’s hooking leg acts as the sickle blade: it wraps behind the ankle at the Achilles tendon and sweeps inward and upward, taking the foot out of its supporting position. The far hand typically controls the opponent’s sleeve or wrist while the near hand or a posted hand creates the pushing force on the knee or hip.
The sickle motion distinguishes this sweep from static ankle-grab sweeps: the leg does not simply grab and pull — it moves in a curved arc, starting outside the ankle and sweeping inward. This arc is mechanically more effective than a straight pull because it matches the direction the ankle must travel to remove it from the supporting position under the opponent’s centre of mass.
INV-13Invariant "Destabilisation precedes control. An opponent who retains structural balance can generate defensive force regardless of the position they are in."
Why it works hereThe sickle sweep targets a single ankle while the opponent is standing on two — destabilisation comes from the curved arc that pulls that foot out from under the centre of mass at the same instant the upper body is driven the other way. Until both forces land together, the opponent retains structural balance: a hook without the upper-body push is neutralised by a hop, and a push without the hook is absorbed by the standing legs. The sweep only succeeds when the structural support is gone before the rebalance reflex can fire.
See full invariant page → The standing opponent’s balance is maintained by the contact points between their feet and the mat. The sickle sweep attacks a single contact point — the near or far ankle — and removes it from the mat with a curved sweeping motion. Once that ankle is removed, the opponent’s centre of mass has no support beneath it on that side, and the push force at the upper body completes the toppling. The sickle works only when both parts act simultaneously: ankle removed, upper body pushed. Either without the other allows the opponent to compensate.
INV-06Invariant "Base is a function of weight distribution over a support point. Disrupting the support point disrupts the base regardless of the size of what sits on it."