Judo shows up at school sports days, club meets and multi-discipline fests with the same split that trips up organisers running karate or taekwondo: it is really two different competitions sharing one name. Kata is a choreographed pair performance of fixed, named throwing and grappling sequences, judged by a panel with no live resistance — the same family of scoring as a judged stage item. Shiai is a contest between two competitors on the mat, decided by points for throws, pins and submissions scored against published criteria, the way a match-based sport is. An organiser running judo alongside taekwondo, kabaddi or a solo dance item on the same programme needs to treat Kata as a judged item and Shiai as a scored match — not force one format into the other’s bracket. This guide covers how each is judged, how age/belt categories typically work, and how to set judo up as a competition item in eTalenter.
Kata: a judged pair performance, not a fight
In Kata, two competitors (tori, who applies the technique, and uke, who receives it) perform a fixed, named sequence of throws, holds and strikes together, with no live resistance — the outcome of every technique is pre-arranged. A panel scores what they see against criteria every major federation uses in some form:
| Scoring element | What the panel is watching |
|---|---|
| Technical accuracy | Correct grips, entries, throwing angles and finishing positions exactly as prescribed for the named technique; no invented, skipped or out-of-order moves |
| Timing and rhythm | Tori and uke moving as a matched pair with no hesitation or mismatched tempo between the two performers |
| Power and commitment | Realistic speed, balance-breaking and control on every throw, without actually injuring the partner |
| Presentation | Posture, bowing etiquette, composure and overall seriousness of the performance |
International judo competition scores each pair out of a fixed scale across these elements, with a panel of judges comparing pairs head to head over several rounds rather than issuing one isolated number. Most school and club fests use a simplified version of the same idea — a judge or small panel scores each pair out of a fixed total, or ranks pairs directly after watching every performance — the same trimmed-mean or panel-ranking method used for solo song and classical dance judging on this site.
Shiai: point-scored contest on the mat
Shiai is a timed contest between two competitors, decided by points for throws, pins and submissions scored under the sport’s rules, with a referee and corner judges controlling the mat the way an umpire controls a match. The scoring ladder most federations and school/club events use:
- Ippon (full point) — an immediate, outright win: a clean, forceful throw landing the opponent largely on their back, a 20-second hold-down (pin), or a submission from an armlock/strangle (where permitted for the age/belt category).
- Waza-ari (half point) — a throw or hold-down that is strong but not quite full-force, full-back or full-duration; two Waza-ari in the same bout end it immediately, equal to an Ippon.
- No score below Waza-ari — current international rules dropped the older “Yuko” partial score; a technique that doesn’t reach Waza-ari earns nothing, though it can still influence a judge’s decision if the bout reaches time with no score.
- Shido (penalty) — an infringement (stepping out of the contest area, false attack, passivity, dangerous technique); accumulated penalties can hand the opponent a score.
If neither competitor scores Ippon (or two Waza-ari) before time runs out, the bout goes to a referee-and-judges decision, or continues as a “Golden Score” sudden-death extension at many events — the first score of any size then ends the bout. Contact level, permitted submissions and mat time are all controlled by the age/belt category: younger or lower-belt brackets typically ban submissions entirely and use shorter bout times.
Age and belt categories
| Category type | Typical bands | Notes |
|---|---|---|
| Age group | Sub-junior, junior, cadet, senior (or LP/UP/HS/HSS at a school fest) | Set first, same as any other competition item on the programme |
| Belt grade | White through black, grouped into beginner/intermediate/advanced bands | Prevents a beginner being matched against an advanced black-belt competitor in Shiai or paired against a mismatched partner in Kata |
| Weight class | Federation-specific weight bands within each age group | Standard for Shiai at club/open level; often skipped at school fests in favour of age/belt only |
What rules to settle before the event
| Decision | Why it matters |
|---|---|
| Which Kata (which named technique set) is required | Different Kata forms exist; competitors need to know which one they’re being judged on well before the event |
| Bout time for Shiai by age/belt band | Younger or lower-belt bouts usually run shorter than senior bouts |
| Are submissions (armlocks/strangles) permitted for this age/belt band | Most junior and lower-belt categories ban submissions outright for safety |
| Weight classes or age/belt only | Decides whether competitors need to be weighed in before brackets are drawn |
| Golden Score sudden-death or straight to decision | Changes how a tied, scoreless bout is resolved |
A step-by-step judging and scoring method for organisers
- Confirm age/belt bands (and weight classes, if used) before accepting entries.
- For Kata: pair competitors, announce the required technique set, and brief judges on the four scoring elements above.
- Score or rank each Kata pair immediately after their performance while it’s fresh for every judge.
- For Shiai: draw the bracket by age/belt/weight band, confirm bout time and whether submissions are permitted.
- Run each bout with a referee calling Ippon/Waza-ari/Shido live, and a scoreboard or scorer tracking the running total.
- Resolve a scoreless tie at time via Golden Score sudden death or a straight referee-and-judges decision, per the rule fixed before the event.
- Record the winner of every bout and every Kata pair’s score, then roll both into the overall results and awards for the event.
Printable Shiai point-tracking sheet
| Bout no. | White (competitor) | Blue (competitor) | Ippon | Waza-ari | Shido | Winner & method |
|---|---|---|---|---|---|---|
| 1 | ||||||
| 2 | ||||||
| 3 |
How eTalenter handles judo as a competition item
Judo is set up as two linked competition items — Kata (Team/pair, judged) and Shiai (Individual, match-based) — under Competition Categories/Items Setup, each assigned to its own age-group/belt categories. Kata’s panel scores or ranking go straight into eTalenter’s judging and tabulation the same way a solo song or classical dance score does. Shiai’s bout-by-bout results are recorded as each bracket round finishes, and the final standings for both items roll into the overall house or school points table alongside every other competition on the programme, with winners published, certificated and awarded the same way.
FAQ
Is judo judged or scored?
Both, depending on which event you mean. Kata is judged — a panel scores or ranks a pre-arranged pair performance with no live resistance, on technical accuracy, timing, power and presentation. Shiai is scored — points (Ippon for a full win, Waza-ari as a half point, Shido as a penalty) are awarded for throws, pins and submissions during a timed contest, and the higher score (or an outright Ippon) decides the winner.
What is the difference between Kata and Shiai?
Kata is a pre-arranged pair performance of fixed, named judo techniques with no live resistance, judged on technical accuracy, timing and presentation. Shiai is a live contest between two competitors, decided by points for throws, pins and submissions scored under controlled rules within a timed bout.
Are submissions allowed at a school judo event?
Most junior and lower-belt Shiai categories ban armlocks and strangles outright for safety, scoring only on throws and hold-downs. Submissions are typically only permitted from a stated age/belt threshold upward — this needs to be decided and published before the event, not improvised mid-bout.
How are belt and weight categories organised alongside age groups?
Most events split by age group first (LP/UP/HS/HSS or a dedicated martial-arts event’s own junior/cadet/senior bands), then by belt grade, and — for Shiai at club or open level — by weight class within that age/belt band, so a beginner or lighter competitor is never matched against a mismatched opponent.
Running judo’s Kata and Shiai items alongside your other stage and sports items on the same event? Open a live demo and log in as a demo coordinator or judge — no sign-up, nothing you click can change the event — to see judged items and match-based items scored and tabulated together. Running your own event on eTalenter? Message us on WhatsApp or email support@etalenter.com for help with the software. We can’t help with individual entries or submissions to an official competition — for that, please contact your school, dojo or the event’s organisers.
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