Sumi-Otoshi Variations | Riki Judo Dojo
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Standard Sumi Otoshi·Riki Judo Dojo·Added by Admin
Riki sensei showed us many different grips and entries for sumi-otoshi (隅落 - corner drop) during judo class on 9-6-2021.…
Standard Sumi Otoshi
Genus隅落とし(Sumi Otoshi)
TraditionalTranslation: corner drop
Overview
Standard Sumi Otoshi executes the classical corner drop where the thrower steps to the side, pulls the opponent diagonally to the rear corner with both hands, and drops the opponent to the mat through the spiralling hand action alone. [1] No hip, leg, or body contact is used — the throw is accomplished entirely by the directional force of the gripping hands pulling the opponent into a void where no support exists. [1],[2] The technique requires the thrower to move off-line and create the corner angle while maintaining powerful pulling action. [2],[3]
History & Origin
Effectiveness
Sumi otoshi (corner drop) is a pure hand technique that requires no leg or hip contact with the opponent, relying entirely on hand action to direct the opponent down to the corner. [1] Its effectiveness depends on precise timing and powerful kuzushi to the rear corner, making it challenging to execute but devastating when successful. [2]
Lineage
Competition Record
The standard sumi otoshi is occasionally scored in IJF competition. [1]
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Biomechanical Mechanism
Primary Action — Loading the opponent onto the hip and rotating them over it — the hip acts as the fulcrum
Joints Involved — Attacker's hip (fulcrum point), knees (deep bend for loading), core (rotation), opponent's centre of gravity (elevated)
Force Vector — Rotational — pulling and turning motion loads the opponent, then hip extension and rotation drives them over
Kuzushi (Off-balancing) — Forward and upward — breaking opponent's posture forward lifts their centre of gravity onto the attacker's hip
Position & Entry
From judo grip — Break the opponent's balance forward (kuzushi), turn in with hip below their centre of gravity, and rotate to throw
From clinch (overhook or underhook) — Secure inside position, turn the hips across the opponent's body, load and throw
Variants
Standard hip throw — full turn-in with hip below the opponent's centre of gravity
No-gi hip throw — adapted without gi grips, using overhook and collar tie
Drop hip throw — dropping to one knee to lower the fulcrum point
Combination hip throw — chaining from a failed foot technique or hand technique
Videos
1 video
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Ratings
Risk of injury to the person this technique is applied to
5
High5/10
Arm throws use arm leverage; shoulder dislocation risk if arm trapped
Skill level needed to execute this technique reliably
Intermediate
Whether this technique is allowed under major competition rule sets
— IJF — Legal throwing technique
IJF Sport and Organisation Rules 2025, Article 27PDF— IBJJF — Legal at all belt levels
IBJJF Rules Book v6.0, June 2024PDF— UWW — Legal in both freestyle and Greco-Roman
UWW International Wrestling Rules, January 2026PDF— Unified MMA — Legal throwing technique
Unified Rules of MMA, August 2025PDF— ADCC — Legal
ADCC Rules Update, April 2025PDF— FIAS Sport Sambo — Legal
FIAS International Sambo Competition RulesPDF— FIAS Combat Sambo — Legal
FIAS Combat Sambo RulesPDFTraining Notes
✓From grips, move to one side of the opponent by stepping diagonally
✓Pull the opponent toward their rear diagonal corner — the corner behind and to one side of them
✓The pulling direction is approximately 45 degrees behind the opponent, to one side
✓Use both hands in coordination: the sleeve hand pulls sideways and back, the collar hand drives the opponent's shoulder toward the rear corner
✓Drop your own centre of gravity as you pull — step back and down to generate the direction
✓The opponent falls to their rear corner because their feet cannot reach back to support
✓Control the fall with the grips — guide them to the mat smoothly
Common Mistakes
!Pulling in the wrong direction — the specific rear corner angle is what the throw depends on
!Not moving laterally before pulling — you must create the angle first
!Pulling upward instead of diagonally downward to the rear
!Using only one hand — sumi otoshi requires both hands working in coordination
!Standing upright during the pull — your centre must drop to generate the downward component
!Attempting from directly in front of the opponent — the corner angle requires a lateral position
!Not training the specific diagonal pulling pattern — the direction must be precise
Related Techniques
Counter Techniques
Lower Centre of Gravity — bend knees and drop hips to make the throw harder to executeBlock the Hip — post hand on the thrower's hip to prevent loadingStep Around — circle away from the throw direction to avoid being loadedGrip Break — deny the thrower their preferred gripping configurationStiff-Arm — maintain distance with straight arms to prevent the entry
Setup Chain
1Grip Setup (Kumi-kata) — establish the controlling grips needed for the throw
2Off-Balance (Kuzushi) — break the opponent's balance in the throwing direction
3Entry (Tsukuri) — position the body for the throw by turning, stepping, or loading
4Execution (Kake) — complete the throwing action with full commitment and follow-through
Sources & References
Primary Source
Kodokan Judo — Official Nage-waza Classification
1BookKodokan Judo — Official Nage-waza Classification
Traditional Judo throwing technique terminology (Kodokan Institute)
Official Kodokan ground technique classification system
Standard Japanese martial arts terminology (kanji/hiragana)
4OtherJapanese Martial Arts Standard Terminology (武道用語)
Established Japanese martial arts naming convention — native Japanese term (和語/漢語)
5CitationKodokan Judo — Official Nage-waza Classification
Traditional Judo throwing technique terminology (Kodokan Institute)
Community
Athletics
Requires
hip rotation speed, core strength, lower back stability
Favours
strong hips and core, good flexibility for turning entry
Key muscles
hip rotators, core, quadriceps, latissimus dorsi
Frequently Asked Questions
Where exactly should my armpit make contact during Sumi Otoshi?
Your armpit should strike the opponent's shoulder, not their arm. This precise contact point is key to executing the technique effectively.
Should I back out or step forward when executing Sumi Otoshi?
Instead of backing out, step with your opponent as they move, then apply the shoulder strike to execute the technique smoothly.
How do I set up Sumi Otoshi with my hands?
Pull with your left hand while pushing with your right hand to set up the throw, similar to transitioning from a chimata grip.
How does the Standard Sumi Otoshi work?
Standard Sumi Otoshi executes the classical corner drop where the thrower steps to the side, pulls the opponent diagonally to the rear corner with both hands, and drops the opponent to the mat through the spiralling hand action alone. No hip, leg, or body contact is used — the throw is accomplished entirely by the directional force of the gripping hands pulling the opponent into a void where no support exists.
Where does the Standard Sumi Otoshi come from?
The standard form of sumi otoshi has been part of the Kodokan curriculum since the early gokyo, representing one of the purest expressions of hand-technique throwing. It is widely studied in judo kata and remains an important competitive technique when executed with precise timing.
Is the Standard Sumi Otoshi legal in competition?
IJF: legal — Legal throwing technique; IBJJF: legal — Legal at all belt levels; UWW: legal — Legal in both freestyle and Greco-Roman; Unified MMA: legal — Legal throwing technique; ADCC: legal — Legal; FIAS Sport Sambo: legal — Legal; FIAS Combat Sambo: legal — Legal
How dangerous is the Standard Sumi Otoshi?
Danger rating 5/10. High — arm throws use arm leverage; shoulder dislocation risk if arm trapped
How do I set up the Standard Sumi Otoshi?
The standard setup chain: Grip Setup (Kumi-kata) → Off-Balance (Kuzushi) → Entry (Tsukuri) → Execution (Kake).
How do I defend against the Standard Sumi Otoshi?
Standard counters include: Lower Centre of Gravity — bend knees and drop hips to make the throw harder to execute / Block the Hip — post hand on the thrower's hip to prevent loading / Step Around — circle away from the throw direction to avoid being loaded / Grip Break — deny the thrower their preferred gripping configuration.
What are the variants of the Standard Sumi Otoshi?
Common variants: Standard hip throw (full turn-in with hip below the opponent's centre of gravity); No-gi hip throw (adapted without gi grips, using overhook and collar tie); Drop hip throw (dropping to one knee to lower the fulcrum point); Combination hip throw (chaining from a failed foot technique or hand technique).
How effective is the Standard Sumi Otoshi in competition?
The standard sumi otoshi is occasionally scored in IJF competition.
What are common mistakes when doing the Standard Sumi Otoshi?
Top errors to watch for: Pulling in the wrong direction — the specific rear corner angle is what the throw depends on / Not moving laterally before pulling — you must create the angle first / Pulling upward instead of diagonally downward to the rear / Using only one hand — sumi otoshi requires both hands working in coordination.
What are other names for the Standard Sumi Otoshi?
The Standard Sumi Otoshi is also known as Sumi Otoshi, Classical Corner Drop, Standard Corner Drop Throw.