🥋 Judo, explained
Japanese grappling sport: win instantly with a perfect throw, a 20-second hold-down, or a submission.
What am I watching?
Judo ('the gentle way') is a Japanese grappling sport in which two athletes in heavy cotton jackets try to throw each other to the ground, hold each other there, or force a submission. There is no striking. What makes judo unique among combat sports is the instant win: one perfect technique — an opponent thrown largely onto their back with force, speed and control — scores ippon and ends the contest on the spot, whether it happens in the first five seconds or the last.
A contest lasts four minutes and starts with both judoka fighting for grips on each other's jacket (the kumi-kata battle) — watch this closely, because whoever wins the grip usually controls the throw. Attacks flow between standing work (tachi-waza: throws like uchi-mata and seoi-nage) and groundwork (ne-waza: hold-downs, armlocks and strangles). A throw that is good but not perfect scores waza-ari, and two waza-ari add up to ippon.
Judo also polices inactivity hard: negative, defensive or overly cautious fighting draws a shido penalty, and three shidos mean disqualification. If the four minutes end level, the contest goes to golden score — sudden-death extra time with no clock limit, where the first score or decisive penalty ends it. Matches begin and end with a bow; the etiquette is not decoration, it is part of the sport.
How scoring works
Judo has a short ladder of scores, and the top one ends the match. Ippon — the perfect score — is awarded for a throw that puts the opponent largely on their back with force, speed and control; for holding the opponent under control on the ground for 20 seconds (osaekomi); or for a submission, when the opponent taps out to an armlock or strangle. Ippon wins the contest instantly.
Waza-ari is the half-step below: a throw with real effect that falls short of ippon's criteria (for example, the opponent lands on their side), or a hold-down of 10 to 19 seconds. Two waza-ari in one contest combine into ippon ('waza-ari awasete ippon') and end it. The IJF has also periodically used a third, lower score, yuko, for lesser throws — removed in 2017 and brought back for the post-Paris rules cycle — so you may see it on scoreboards; it never adds up to anything, serving only as a tiebreaker below waza-ari.
Penalties run in parallel: shido for minor infringements (passivity, false attacks, defensive gripping, stepping outside), with the third shido becoming hansoku-make — disqualification and the match. Serious offences draw direct hansoku-make. Shidos do not add points to the opponent's score, but they decide contests: if the scores are level at full time, the contest goes to golden score, where the first score of any kind — or a decisive penalty against either athlete — ends the match immediately.
- Ippon ends the contest instantly: a dominant throw onto the back, a 20-second hold-down, or a submission.
- Waza-ari is the half score: a lesser throw, or a 10-19 second hold-down.
- Two waza-ari combine into ippon and end the contest.
- Armlocks (elbow only) and strangles force submission — the opponent taps, ippon is awarded.
- Shido is the penalty for passivity and minor infringements; three shidos = hansoku-make (disqualification).
- Serious dangerous acts draw direct hansoku-make.
- Contests last 4 minutes; a tie triggers golden score — unlimited sudden-death extra time.
- In golden score, the first score or decisive penalty wins the match.
Formats
Individual (IJF rules)
Mixed team event
Kata competition
The rules
The contest area, judogi and etiquette
Contests take place on tatami — firm mats with a marked square contest area surrounded by a safety zone. Stepping outside the contest area deliberately, or pushing the opponent out, is penalised; techniques must essentially happen inside.
Athletes wear the judogi, a reinforced cotton jacket and trousers with a belt — one competitor in white, the other in blue at IJF events. The jacket is not just clothing; it is the primary handle of the sport, which is why gi material, fit and grip rules are tightly regulated. Every contest begins and ends with a standing bow (rei), and the referee's commands are in Japanese: hajime (begin), matte (stop/break), sore-made (that is all — end of contest).
How you win: the scores
Judo's scores form a short ladder, and the top rung ends the match immediately.
Ippon
The perfect score, ending the contest instantly. Awarded for a throw that lands the opponent largely on their back with force, speed and control; for a 20-second osaekomi (hold-down); or when the opponent submits to an armlock or strangle. One ippon is worth more than any accumulation of lesser scores.
Waza-ari
The half score, for a throw with real effect that misses one of ippon's criteria (for example, landing the opponent on their side rather than the back), or for a hold-down of 10 to 19 seconds. Two waza-ari combine into ippon — 'waza-ari awasete ippon' — and end the contest.
Yuko
A third, lower score that the IJF has used on and off — removed in 2017, reinstated for the rules cycle after Paris 2024 for lesser throws such as landing the opponent on their side or seat. Yukos never combine into anything; they only separate athletes who are level on higher scores.
Standing judo: throws and grips
Tachi-waza (standing techniques) is where most contests are decided. Everything starts from kumi-kata, the grip fight: judoka battle for dominant holds on the opponent's collar and sleeve, because the grip controls the throw. Refusing to take a grip, or gripping purely defensively, is penalised with shido.
Throws work by kuzushi — breaking the opponent's balance — before the attacker enters and executes. The major families: hip throws (koshi-waza, like o-goshi), hand techniques (te-waza, like seoi-nage), foot sweeps and reaps (ashi-waza, like o-soto-gari and de-ashi-barai), and sacrifice throws (sutemi-waza, like tomoe-nage) where the attacker deliberately falls to throw. The quality of the landing — how much of the back hits, with how much force and control — determines whether it is ippon, waza-ari or nothing.
Groundwork: ne-waza
When the contest goes to the ground, judoka can win three ways: osaekomi (pinning the opponent mostly on their back under control — 20 seconds for ippon, 10 for waza-ari), kansetsu-waza (joint locks, legal only against the elbow), and shime-waza (strangles using the arms or the opponent's own collar). A trapped athlete submits by tapping twice; the referee can also stop the contest to protect an athlete who will not tap.
Referees allow ne-waza to continue only while there is real progress; if the action stalls, they call matte and stand the athletes back up. This keeps judo groundwork fast and decisive compared with grappling sports that allow long stalemates. Armlocks other than at the elbow, and any strangling with the bare hand alone or attacks to the spine or neck joints, are forbidden.
Penalties: shido and hansoku-make
Shido is the penalty for minor infringements: passivity (not attacking), false attacks staged to look busy, defensive posture, avoiding grips or holding illegal ones too long, stepping outside the area, and untidy infringements like intentionally disarranging the judogi. Shidos do not add to the opponent's score, but they accumulate: the third shido is hansoku-make — disqualification, and the match.
Direct hansoku-make punishes acts against the spirit or safety of judo: dangerous techniques such as diving head-first, deliberately injuring the opponent, or serious breaches of conduct. In golden score, a single shido difference is decisive — a penalty against one athlete ends the contest in the other's favour. Watching the penalty count is as important as watching the scoreboard.
Golden score
If the four minutes end with the scores level, the contest moves immediately into golden score: sudden-death extra time with no time limit. The scoreboard carries over (including shidos), and the first event that separates the athletes ends the match — any score, or a penalty that creates a difference between them.
Golden score contests can be brutal tests of will and conditioning, occasionally running longer than the regulation contest itself. Because a single shido decides it, referees' passivity judgements become decisive, and athletes must keep attacking convincingly even when exhausted.
Contest time, weight categories and competition format
Senior IJF contests last four minutes for both men and women, plus unlimited golden score. There are seven weight categories per gender: men from under-60 kg to over-100 kg, women from under-48 kg to over-78 kg.
Major events use single-elimination brackets with a repechage for quarter-final losers, which is why judo — like wrestling — awards two bronze medals per category. The IJF World Tour (Grand Slams, Grand Prix, the World Championships and the Masters) runs year-round and feeds a world ranking that determines Olympic qualification.
Safety, ukemi and what is forbidden
Judo's throws look violent but are survivable because every judoka drills ukemi — breakfalls that spread impact by slapping the mat and tucking the head. The rules reinforce safety: no strikes of any kind, no joint locks except at the elbow, no attacks to the spine or neck, no head-diving throws, and severe punishment for anything that endangers the opponent's neck or spine.
The referee's matte stops action instantly, and medical rules govern injuries, blood and dress. This safety architecture is why judo is practised recreationally by millions, including young children, while remaining a full-contact Olympic sport at the top level.
Judo's origins and its place in India
Judo was founded in 1882 by Jigoro Kano, who refined jujutsu techniques into an educational discipline with a moral code — its principles of maximum efficiency and mutual welfare are still taught alongside the techniques. It became an Olympic sport for men at Tokyo 1964 and for women in 1992, and remains one of the most widely practised sports in the world; the Paris 2024 judo hall was among the hottest tickets of the Games.
In India, judo is a developing sport rather than a medal staple: Indian judoka have won Commonwealth Games medals — including Sushila Devi Likmabam's silver — and compete at the Olympics, while judo's grappling DNA overlaps naturally with India's deep wrestling culture. The Judo Federation of India runs national championships across age groups.
Glossary — 33 terms
Stats decoded
| Stat | Unit | What it tells you |
|---|---|---|
| Wins by ippon | contests | Contests ended with the perfect score — throw, 20-second hold, or submission. A high ippon rate marks a decisive, attacking judoka rather than a penalty-grinder. |
| Waza-ari scored | scores | Half scores registered across contests. Consistent waza-ari output shows an athlete whose attacks land with real effect even when they fall short of ippon. |
| Wins by submission | contests | Contests won by armlock or strangle in ne-waza. A strong submission count signals elite groundwork — dangerous every time the fight touches the mat. |
| Wins by hold-down | contests | Contests won by pinning the opponent for the full osaekomi count. Reflects control-oriented ne-waza and the ability to transition instantly from a throw into a pin. |
| Shidos per contest | penalties/contest | Average penalties received. Low numbers matter enormously: three shidos lose a contest outright, and in golden score a single shido difference is the match. |
| Golden score win rate | % | Share of golden-score contests won. Sudden-death extra time tests conditioning and nerve; athletes with strong golden-score records are the ones you back in tight matches. |
| Attacks per minute | attacks/min | Genuine throw attempts per minute of contest time. High attack rates keep referees' passivity judgements on the opponent's side — and busy attackers rarely collect shidos. |
| Ne-waza win share | % of wins | Proportion of wins earned on the ground (hold-downs and submissions) rather than by throws. It profiles an athlete's style — pure throwers versus transition specialists. |
| IJF world ranking points | points | Points accumulated on the IJF World Tour (Grand Prix, Grand Slams, Worlds, Masters). The ranking seeds draws and drives Olympic qualification, so it is the sport's master career metric. |
| Average contest time | min | How long an athlete's contests last on average. Short times usually mean early ippons; consistently long, golden-score-heavy matches flag a grinding style and a heavier tournament workload. |
Quick answers
What is an ippon in judo?
Ippon is judo's perfect score and it ends the contest immediately. It is awarded three ways: a throw that lands the opponent largely on their back with force, speed and control; holding the opponent down for 20 seconds (osaekomi); or a submission, when the opponent taps out to an armlock or strangle. One ippon outranks any number of lesser scores, which is why judo matches can end in seconds.
What is the difference between ippon and waza-ari?
Waza-ari is the half score — a throw with real effect that misses one of ippon's criteria (for instance, the opponent lands on their side rather than square on the back), or a hold-down of 10 to 19 seconds instead of 20. Crucially, two waza-ari in the same contest combine into ippon ('waza-ari awasete ippon') and end the match, so an athlete holding one waza-ari needs only a second solid attack to win.
What is a shido in judo and how many lose you the match?
Shido is the penalty for minor infringements — passivity, fake attacks, overly defensive gripping, or stepping out of the contest area. Shidos give the opponent no points, but they stack: the third shido becomes hansoku-make, meaning disqualification and the loss of the match. In golden score a single shido difference ends the contest immediately, so the penalty count is often as decisive as the scoreboard.
What is golden score in judo?
If a contest is level after the four minutes of regular time, it continues into golden score: sudden-death extra time with no time limit. All scores and penalties carry over, and the first thing that separates the athletes ends the match — any score, or a penalty given to either side. Golden-score battles can run longer than the original contest and are among the most dramatic passages in the sport.
Can you win a judo match on the ground?
Yes — three ways. A hold-down (osaekomi) that controls the opponent mostly on their back scores ippon at 20 seconds and waza-ari from 10 to 19. Armlocks against the elbow (like juji-gatame) and strangles using the arms or collar win instantly when the opponent submits by tapping. Referees stand the athletes up if groundwork stalls, so ne-waza in judo is a fast, decisive phase rather than a long positional grind.
What is illegal in judo?
All striking, joint locks anywhere except the elbow, attacks on the spine or neck, and dangerous actions like diving head-first into the mat are forbidden — the worst offences draw direct hansoku-make (disqualification). Minor negativity — passivity, false attacks, defensive gripping, stepping out — is punished with shido, three of which also mean hansoku-make. The rulebook is engineered so that the only winning strategy is genuine, committed attacking judo.
How long is a judo match and what are the weight classes?
Senior contests last four minutes for both men and women, plus unlimited golden score if tied. There are seven weight categories per gender at the Olympics and World Championships — men from under-60 kg up to over-100 kg, and women from under-48 kg up to over-78 kg. Major tournaments run single-elimination brackets with a repechage, so each category awards two bronze medals.
Is judo popular in India?
Judo is a growing sport in India rather than an established medal source. Indian judoka have won Commonwealth Games medals — Sushila Devi Likmabam's silver among them — and have represented India at the Olympics, with strong participation in age-group and women's competition. India's deep wrestling culture gives judo a natural talent overlap, and the Judo Federation of India runs national championships across age categories.