Irimi Ashi Sweep

What This Is

Irimi ashi — entering leg — is a movement-based sweep drawn from judo footsweep principles applied from the bottom guard position. The bottom player inserts their lead foot behind the passer’s lead ankle as the passer steps or closes distance, and reaps the ankle while simultaneously pushing at the hip. It is a single-leg reap from below: the bottom player does not wait for the passer to be off-balance and then sweep — they create the imbalance through committed movement into the passer’s space.

The defining characteristic is the “irimi” — the entering component. The bottom player’s hips must move forward and upward toward the passer to generate the sweeping force. A foot reap without hip commitment produces no mechanical effect. The sweep lives or dies on whether the bottom player commits their body mass into the movement. This is what makes it advanced: static guard players rarely develop the movement instinct the irimi requires.

Unlike most guard sweeps, which are applied from a defensive or neutral position, the irimi ashi requires the bottom player to move toward the passer — a counterintuitive motion when under pressure. This timing and directional commitment is the primary skill gap between developing and advanced practitioners attempting this technique.

The Invariable in Action

The hand controls in irimi ashi serve a specific purpose: they redirect the passer’s upper body away from the foot being reaped. As the foot reaps the ankle backward, the hand on the opposite hip pushes that hip forward and away — the upper body and lower leg move in opposing directions, creating the rotation. Without the hand disruption, the passer can lean forward onto the side being swept and absorb the reap. The hands do not control for submission — they control for directional separation.

The irimi is a hip-forward motion from the bottom. The bottom player’s hips must drive into and under the passer’s hip line as the foot inserts behind the ankle. Without that forward hip drive, the reap has no body weight behind it — the foot alone cannot produce the sweeping force. Hip mobility is required not just to maintain guard but to generate the entire offensive mechanism of this sweep. A flat or immobile bottom player cannot execute irimi ashi under any circumstances.

The irimi ashi times against the passer’s step — the moment the foot completes its placement and the weight loads onto it. The bottom player inserts the reaping foot as that weight transfer completes, catching the ankle in the moment of full load. Timing against the load is what makes the reap effective: the ankle is fixed to the mat by the passer’s full body weight, and the reap disrupts that fixed point. Attempting against a foot that is still in motion — mid-step — produces no effect because the weight has not yet committed.

The passer is moving toward the bottom player when the irimi ashi fires — closing distance to pass. The reap reverses that forward movement suddenly: the passer’s lead foot is pulled backward while their momentum is forward. This is INV-13 directly applied: the passer’s own forward movement becomes a liability when direction-reversed by the reap. The suddenness of the reversal prevents the post. A passer who is standing still is harder to irimi ashi than one who is stepping in.

Setup and Entry

From Shin-on-Shin (Primary)

The primary entry occurs when the passer closes distance from the shin-on-shin position — stepping their lead foot forward to advance the pass. The bottom player watches the step. As the lead foot lands and the weight begins to transfer, the bottom player inserts their near foot behind the passer’s lead ankle — specifically the heel makes contact with the Achilles/ankle rather than the shin. Simultaneously, the hips drive forward and upward, and the near hand contacts the passer’s far hip to redirect the upper body.

The foot insertion must be timed to the completion of the step. Too early and the passer is still moving — the reap finds no load. Too late and the passer’s weight is fully settled and the reap requires greater force to disrupt.

From De la Riva

The DLR hook provides a connected starting position. When the passer steps the hooked leg forward to advance — a common DLR passing sequence — the bottom player can release the DLR hook and convert that leg to the reaping foot, inserting behind the ankle as the step completes. The DLR connection provides the forward proximity the irimi entry requires; the reap follows naturally from that proximity.

Entry Conditions

The irimi ashi requires the passer to be moving toward or closing distance. It is not available against a passer who is retreating or stationary at distance. Read the passer’s intent: a passer stepping in to flatten or knee-cut is the target. A passer backing away to disengage is the wrong moment — apply a different sweep to the retreating movement and keep irimi ashi for the advance.

Execution

The Foot Reap

The heel catches the outside of the Achilles tendon or ankle — not the shin or the mid-foot. The heel-to-ankle contact point provides the most reliable reaping surface. The reap direction is backward and slightly to the outside — pulling the ankle behind and away from the passer’s midline, rotating their base out from under them. The reaping leg’s motion is a heel drag, not a kick: controlled pressure backward, not a snap.

The Hip Entry

As the foot reaps, the bottom player’s hips drive forward and upward — this is the irimi, the entering. The body weight travels into the passer’s space at the same moment the foot reaps backward. The combination produces a rotation: the ankle goes backward, the passer’s center of mass is driven forward and upward by the entering hips, and the passer rotates over the reaping leg.

The hand on the far hip amplifies this rotation — pushing the passer’s upper body away from the reaped leg at the same moment. The result is a controlled fall: the passer’s lead ankle is reaped back, their hip is pushed forward, and they land on the side of the reaped leg. The bottom player follows immediately to top position.

Following Through

The irimi entry places the bottom player’s hips close to and partially under the passer — this is correct. From this position, following to top is a continuation of the forward hip drive: the bottom player rises from the hip entry into a top position as the passer lands. Do not stop the hip drive at the moment of the reap — continue through to the top.

Common Errors

Drilling Notes

Ability Level Guidance

Also Known As

Related Pages