It is the only submission in Brazilian Jiu-Jitsu named for the man who used it to beat the sport's founder. On 23 October 1951, Masahiko Kimura broke Hélio Gracie's arm with a shoulder lock in Rio de Janeiro — and the Gracies, in a gesture that says more about the art than any victory could, kept the technique and gave it the victor's name.
On 23 October 1951, in Rio de Janeiro, Hélio Gracie's left arm was already broken and he still would not tap.
Across the mat from him — or rather, on top of him — was Masahiko Kimura, a 34-year-old Japanese judoka who had not lost a serious match since the 1930s. Kimura had trapped the arm in a figure-four, driven Hélio's elbow up behind his own shoulder blade, and rotated. The joint gave way. Hélio, 38 years old and the smaller man by a wide margin, did not signal. So Kimura rotated again.
It was Carlos Gracie — Hélio's older brother, the man who had brought jiu-jitsu into the family three decades earlier — who ended it. He threw a towel onto the mat and walked over to tap Kimura twice on the back. The match was over. The shoulder lock had done exactly what Kimura told the Gracies beforehand it would do.
Here is the part that makes the story unusual in the history of combat sports. The technique that beat the founder of Gracie jiu-jitsu did not get buried, disowned, or explained away. It got adopted. In Brazil the reverse arm-entanglement Kimura used that afternoon has been called, ever since, the kimura — the loser's art carrying the winner's name into every academy on earth. Judo already had a word for it (ude-garami). Catch wrestlers had called it the double wristlock for half a century. But in the language most of the grappling world now speaks, it is named for one man and one afternoon.
This is not a story about a defeat. It is a story about what a mature art does with the technique that beat it: studies it, teaches it, and hands it to its white belts on their first week.
The kimura is the only submission in jiu-jitsu named for the man who used it to defeat the art's own founder — and the Gracies kept the name on purpose, because the lesson of 1951 was never "we won."
Masahiko Kimura was, by most accounts of his era, the finest judoka alive. He was born on 10 September 1917 in Kumamoto, began judo around age nine, and was promoted to fifth-dan (godan) at eighteen after winning eight consecutive matches in a single Kodokan grading — reportedly the youngest man to reach that rank at the time. In 1937, at twenty, he won the All-Japan Judo Championship, and for roughly the next thirteen years he was not beaten in the event. He is often said to have lost only four judo matches in his life, all of them in 1935, early in his career. His training volume was the stuff of legend even among people who train for a living, guided for years by his teacher Tatsukuma Ushijima.
By 1951 Kimura was no longer competing under Kodokan's amateur umbrella. He had turned to professional wrestling and prizefighting, and a tour brought him and a group of Japanese judoka to Brazil, where the Gracie family had spent two decades building a reputation on open challenge matches. A meeting was inevitable.
It did not begin with Kimura. The Japanese side insisted Hélio first face Yukio Kato, a younger, lighter judoka — the reasoning, as it has been handed down, being that if Hélio lost to the much larger Kimura first, the Gracies could dismiss the result as a matter of size. Hélio met Kato at Maracanã in September 1951; the first meeting is generally recorded as a draw across three ten-minute rounds, with a rematch shortly after that Hélio won. Having gotten past Kato, Hélio earned the match he actually wanted.
The terms for 23 October were three ten-minute rounds, and the venue was the Maracanã complex in Rio. What no reliable record supplies is a weigh-in. The precise weights of the two men were never officially taken, which has not stopped seven decades of retellings from filling the gap with numbers — some modest, some enormous. What is not in dispute is direction: Kimura was clearly the heavier, stronger man, and Hélio was giving up a substantial margin. The specific figure is where the folklore runs ahead of the evidence, and any account that states it to the kilogram is guessing.
The match itself was one-sided in the way a match between a generational talent and a smaller, game opponent tends to be. Kimura threw Hélio repeatedly; the soft mat and Hélio's break-falling kept the throws from ending anything. In the second round Kimura passed to a pin, held it, and worked to the reverse ude-garami — the figure-four shoulder lock. He finished it in roughly thirteen minutes of total fight time. Hélio's refusal to submit is the detail every generation of his family has told since, and it is the detail that matters: he lost the match on Kimura's terms, but he lost it standing behind his own claim that a smaller man could survive against the best in the world. Carlos threw the towel. The arm was broken.
The name came later and less cleanly than the legend suggests. In Brazil the technique became associated with Kimura by reputation, and one account holds that sportswriters coined a term — "Kimuriana" — around his return tour later in the decade, which the grappling world eventually shortened to the single word now used everywhere. The through-line is simple enough: judo named the lock for its mechanics, and Brazil named it for the man.
Strip away the history and the kimura is a shoulder lock built on a figure-four grip. Everything else is a variation on getting to that grip and finishing from it.
The grip. You take the opponent's wrist with one hand. Your other arm threads under their upper arm, above the elbow, and your second hand grips your own wrist. Seen from above, your two arms and their trapped arm form a figure-four — the same geometric lock that underpins the americana and, in a different plane, several leg entanglements. In catch wrestling this is the "double wristlock"; in judo it is ude-garami; the reverse orientation Kimura used is gyaku-ude-garami. The community says "kimura" and means the whole family.
The target. The kimura is not a wristlock, despite the grip on the wrist. The wrist is a handle. The joint under attack is the shoulder. You bend the opponent's arm to roughly ninety degrees at the elbow, then rotate their forearm and hand behind their back — internal rotation of the shoulder, taken past the range the joint is built to allow. The elbow bend is what protects the elbow and transmits the force cleanly to the shoulder. This is the single most important idea in the technique, and the one beginners most often miss: you are turning the whole arm like a crank, and the crankshaft is the shoulder capsule.
Why "behind the back" and not "up." A common early error is to rotate the hand toward the head. That direction attacks nothing; the shoulder has plenty of range that way, and a strong opponent will simply ride it out. Rotation toward the hip and the back — the direction the shoulder does not want to go — is the finish. If it feels like you are trying to touch the opponent's own wrist to their far kidney, you are rotating the right way.
Where it comes from. The kimura's defining virtue is that it is available from more positions than almost any other submission in the sport:
The kimura as a control, not just a finish. The modern understanding — and the reason the technique matters more in 2026 than it did in 2001 — is that the figure-four grip is one of the strongest two-on-one controls in grappling before it is a submission. Once you own the grip, the opponent's arm is welded to their own torso. From there you do not need the tap: you use the grip to sweep, to pass the guard, to take the back, or to force the opponent to give up a limb to escape. The finish is one exit among several. This is the conceptual leap that turned a single technique into a system.
For most of jiu-jitsu's competitive history, the kimura was a respected finish that lived mostly in side control and half guard. It was reliable, it was fundamental, and it was not a game. That changed.
The pivot most people point to is David Avellan's Kimura Trap System, released as an instructional in 2012. Avellan — an ADCC veteran and 2004 ADCC Superfight winner — did not invent the kimura, obviously. What he did was organize it: he mapped the figure-four grip as a hub from which sweeps, guard passes, back-takes, takedowns, and submissions all branch, and he popularized the term "kimura trap" as shorthand for using the grip to chain rather than to finish in isolation. The framing caught on because it matched where the sport was already going — toward positional systems built around a single dominant control rather than a menu of disconnected moves.
In elite no-gi in 2026, the kimura grip is everywhere, and it is rarely the last thing that happens. Watch high-level matches and you see it used as a back-take mechanism (the grip drags the opponent off their base), as a guard-passing tool (the trapped arm cannot frame), and as a defensive weapon against leg-lockers who overcommit their hips. The through-line from Avellan's system to the current game is direct: the figure-four is a steering wheel, and the submission is only one destination.
The gi game kept the older wisdom alive too. In closed guard and half guard, the kimura remains one of the highest-percentage grips available to the bottom player, precisely because it does double duty — threaten the shoulder, or use the threat to sweep. The half-guard kimura sweep is a fundamental most competitors above blue belt can execute in their sleep.
What has genuinely changed is the framing. The 1951 kimura was a finish. The 2026 kimura is an operating system that happens to include a finish. The mechanics of the lock are identical to what broke Hélio's arm; the strategic weight around it is entirely different.
Two matches, forty-nine years apart, define the kimura's place in the sport — and both, strikingly, end with a Gracie's arm breaking because he would not tap.
The brief for this series asks writers to cite real, dated instances or cut the section rather than invent. The kimura appears in thousands of matches; these two are singled out because they are the ones that carry the technique's meaning, not merely its use. A fuller list of modern high-level kimura finishes is a research item flagged below rather than a set of claims asserted here.
White belt learns the side-control kimura as a shape: trap the wrist, figure-four, keep the elbow bent, rotate the hand toward the back. The first lesson is that it is a shoulder lock, not an arm-pull.
Blue belt learns to defend it — hiding the arm, grabbing the belt or the own-thigh, keeping the elbow glued down — and in learning to defend it, finally understands the finish. The blue belt also meets the kimura from guard and half guard for the first time.
Purple belt stops chasing the tap. The purple belt discovers the grip is a control: kimura to sweep, kimura to pass, kimura to the back. The submission becomes a threat that opens three other doors.
Brown belt runs the trap as a system. The figure-four is a hub, and the brown belt flows through it — losing the finish, keeping the grip, arriving somewhere better. Defense at this level is pre-emptive: the brown belt does not get their arm trapped in the first place.
Black belt uses the kimura grip to steer, often without any intention of finishing with it. It is a way to move an opponent's body, break their structure, and force decisions. The finish, when it comes, is usually a mistake the opponent made under the pressure of the grip.
1. Rotating the wrong way. Cranking the hand toward the opponent's head instead of behind their back. The shoulder has range in the wrong direction and none in the right one. Rotate toward the hip and the spine, not the ear.
2. Straightening the arm. If the trapped arm extends, the lock leaks force into the elbow and the opponent can often power out or turn it into an escape. Keep the elbow bent to roughly ninety degrees throughout — the bend is what loads the shoulder.
3. No control of the far side. Attacking the kimura from side control without pinning the opponent's escape route lets them roll, sit up, or run their hips out. Trap the head, the hips, or step over — remove the escape before you rotate.
4. Losing the wrist to a grip break. The opponent grabs their own belt, gi, or thigh, and your finish stalls. The fix is to break that grip first — strip the hand, use a bump or a step to create the leverage — rather than yanking against a locked-in defensive grip.
5. Treating it only as a finish. The most common conceptual error above blue belt. If the tap is not there, the grip still is. A kimura that does not finish should become a sweep, a pass, or a back-take — not a discarded attempt.
At open mat this week, isolate the kimura grip from side control against a same-rank partner. Fifteen-minute round, one constraint: you are only allowed to establish the figure-four and load the shoulder to a controlled 70 percent — no ripping — while your partner defends by hiding the arm and gripping their own thigh or belt. No other attacks.
You will learn two things fast. First, the finish lives or dies on the grip break, not the rotation. Second, when your partner successfully defends, the grip is still yours — so add a second round where a stuffed kimura must become a sweep or a transition to north-south. That single rule, "a failed kimura is not a finished exchange," is the entire modern game in miniature.
Repeat weekly. The shoulder lock that broke a founder's arm is also the most patient control in the sport.
The kimura is a hub, not a leaf. It connects to more of the map than almost any other submission.
Every one of these connections runs through the same figure-four grip. Learn the grip, and the map opens.
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