Sumi Gaeshi: The Corner Throw

Nothing travels to any corner. They land on you in a heap, and you have traded a stalled attack for the bottom of a pin. Sumi gaeshi was open in that moment. Not straight back. It never is.

Section 01What the Throw Is

Sumi gaeshi (corner throw) is a sacrifice throw. Tori (the thrower) gives up a standing position on purpose, drops under uke (the partner receiving the throw), and uses a lifting leg inside uke's thigh plus a strong upper-body pull to roll uke over a diagonal line, toward the corner, past tori's shoulder. The name is the instruction. Sumi means corner, and the corner is where uke goes.

Three parts have to agree. The grip bends uke forward and keeps them there. The lift leg hooks and lifts rather than kicks. The direction is diagonal from the first inch, because a corner throw pulled straight back becomes a collapse with a leg in the way. When students say the throw does not work for them, the missing part is most often the direction.

This piece teaches the version modern gripping offers first. The primary entry uses an over-the-back grip, taken over uke's shoulder to the back of the jacket or the belt area as your club teaches it. The contingency entry uses a double-lapel grip. Both are real. They do not arrive equally often. The over-the-back picture is the one a bent-over partner hands you.

Section 02The Picture That Offers It

Sumi gaeshi answers a specific shape. Uke is bent forward at the waist, head down or turned, weight committed over their front foot, often because your forward attack was defended, or because they drove in low and stayed there. Their posture has closed the door on most forward throws and opened this one.

Read the shape honestly. A partner crouched for a second, still balanced and ready to stand tall, has not offered the throw. A partner whose hips drop back while their shoulders lean forward has offered even less, because their weight is travelling away from your lift. The offer is weight forward, hips over the feet, back exposed to your reaching hand. Clubs feed the shape at different speeds in drilling. That variation is normal. The shape itself does not vary.

Section 03The Primary Grip: Over the Back

The over-the-back grip does two jobs. It holds uke in the bent shape, and it gives your pull a line over uke's shoulder toward the corner. Your other hand controls uke's sleeve or arm on the lifting side, so uke cannot post out of the roll as you drop.

Take the grip before you drop. That order is the whole entry. In fit-ins the standard is plain: grip secured, bend confirmed through your hand, sleeve controlled, and only then does your body start down.

The pull is not a yank toward your chest. Pull along the travel line, up and over toward the corner past your shoulder. A pull into your chest drags uke's weight onto you as you sit. A pull along the line starts the roll before your back reaches the mat.

Grip details vary between clubs. Some teach the hand deep to the belt, some a strong hold on the back of the jacket. Treat that as variation to learn from your own coach. What does not vary is the job: bend held, line set, no reaching after the drop has started.

Section 04The Contingency: Double Lapel

When uke's back stays out of reach, the double-lapel version is the fallback. Both hands work the lapels, drawing uke forward and down into the bend. The same lift leg and corner direction finish the throw.

Teach it second and drill it less. The double-lapel entry asks you to manufacture the bend the over-the-back picture gives you for free, and manufactured bends fail against partners who stand up through the pull. Its honest uses are narrower: a partner who bends without offering the back, or a grip exchange where both lapels are what you actually hold when the shape appears. A drilled contingency beats a primary grip you keep waiting for while the shape closes. A contingency you reach for first will cost you the better throw most nights.

Section 05The Lift Leg: A Hook and a Lift

The lifting leg places inside uke's thigh, shin and instep hooking as your club teaches the contact, and lifts as your body rolls. Two faults turn it into decoration. The first is kicking. A kick pushes uke away from the roll and spends the contact that tells you where uke's weight is. The second is a parked hook, left still while your hands try to throw uke by themselves.

The lift is timed, not constant. The leg hooks as you sit, light at first, holding contact and reading weight. It lifts hard as your back rounds toward the mat and your hands pull along the corner line, so leg, hands, and drop peak together. If the lift fires early, uke is pushed off the hook. If it never fires, you have sat down under a bent partner and given them a mat to lean on.

Section 06Direction: Always the Corner

Every failed sumi gaeshi has the same film. Tori drops well, the leg is placed well, and uke travels straight down the middle, landing across tori's body. The throw was aimed where tomoe nage goes. Sumi gaeshi does not live there.

Build the corner into the entry step. Your step-in is not square to uke. It angles so sitting line, pull line, and fall line all point to the same diagonal. Uke should land beyond your shoulder on that line. Landings down your centre line are not near misses. They are the wrong throw, and the set stops to fix the aim before speed returns. If you cannot name the corner before you sit, you are not ready to sit.

Section 07The Ukemi Gate Is Pass/Fail

Uke does not receive a full sumi gaeshi until uke's falling is reliable for this throw: the diagonal travel fall or roll your club teaches for it, chin tucked, no arm posted straight into the mat, shown at speed and under mild surprise. Tori does not throw it at full travel until tori's own drop, roll, and recovery falling are reliable, because a half-landed throw still asks tori to fall well while holding a partner.

Pass or fail. No percentage version, no throwing it gently to a partner whose fall is not ready, no senior-player exception. A partner who has not passed can still train entries, grip work, and fit-ins where nobody leaves the ground. The gate closes one kind of rep. It does not close the learning.

Space sits inside the same gate. The diagonal flight path must be clear of other pairs, walls, and mat edges before the drop starts, and the check is spoken in early drilling.

Section 08Landing and Following Through

A clean sumi gaeshi ends with uke on their back past your shoulder and you still holding a grip, already moving. A half-landed one ends with uke on a hip or side and the ground game starting whether you planned it or not. Plan for both.

The follow-through standards for what happens after a throw lands are taught in the library's throw-to-ground work, in "The Throw That Lands in the Armlock." This article does not repeat that teaching. Hold it as the standard this throw feeds into: keep the grip you finish with, arrive beside or past uke rather than underneath them, and choose the first ground action while you are still rolling.

Sumi gaeshi adds one line. Because you chose the floor, your recovery is part of the throw. A tori who lands, lets go, and lies flat has finished a drill, not a throw. Roll with it, keep a hand on, and be somewhere useful within a breath.

Section 09Defending It: The Other Half

In randori the shape that offers this throw is one you will visit every time a forward attack of yours is defended. Defence starts there, one beat before any technique.

The first defence is posture discipline. A bend that lasts half a second while you recover is training. A bend you live in, head down, hand parked on a partner's back, is an invitation. Stand out of the bend as your first recovery action, or change the angle so your back leaves the reaching line.

The second defence is the back hand. When a partner's hand comes over your shoulder toward your back or belt, that hand is the throw announcing itself. Strip it, shrug it off the line, or turn your shoulder so the grip lands on cloth that moves with you. A back grip that never settles cannot hold a bend.

The third defence answers the drop itself. As tori sits, step toward the corner they are aiming at and past their hip line, or base your hips back and down while your free hand posts on their shoulder or hip to keep your weight out of the lift. Stepping to the corner is stronger where space allows, because it walks you out of the arc. Basing back is the answer when the corner is crowded. Either way, never lean further forward to see what they are doing. Curiosity feeds the lift leg exactly the weight it wants.

Section 10Where It Goes Wrong

Thrown straight back. The signature fault. The fix is aim, drilled on a taped corner line at fit-in speed until landings live on the line.

Reaching after the drop. The back grip chased from the floor. The fix is order: grip, confirm, sit. Any rep where the hand reaches after the sit starts is restarted.

The kicking leg. The lift spent as a push. The fix is timing work at a crawl, lift called by the coach as hands and drop peak.

Sitting in front of the bend. Distance too large, so uke's weight settles on you. The fix is the step-in standard: sit under their forward weight.

Skipping the gate for a keen partner. Enthusiasm is not falling skill. The gate applies the same way on every night.

Section 11The Companion Guide

This article gives you the knowledge. The companion guide turns it into training. The Sumi Gaeshi Playbook carries grip-entry cards with the over-the-back version first and in full, the double-lapel contingency card, lift-leg placement drills, direction-reading progressions fed by uke at three postures, fit-in and crash-mat progressions with landing grades, and follow-through standards that build on the throw-to-ground work instead of repeating it. The ukemi gate is printed as a pass/fail checklist with a coach's sign-off line.

It is made for intermediate players whose coach has opened sacrifice throws to them, who keep throwing this one straight back, and for partners who want a defence that starts before the drop.