Data sources
The archive is compiled from international judo competition records — the contest-by-contest output of IJF sanctioned events (Grand Slams, Grand Prix, Masters, Continental Championships, Olympic Games, World Championships, and related senior tour events). Each contest contributes a row to our internal database along with the competitors, the scoring outcome, the weight class, the round, and the event date.
Historical championship archives supplement the live tour feed with season-level context. We do not publish information that cannot be traced back to a recorded contest in the underlying dataset.
Athlete identification
Athletes are identified by a stable internal identifier that persists across events. Where names appear in multiple transliterations, we preserve the form used by the competitor’s federation and index additional spellings for internal search. Two athletes with identical names are disambiguated by country and birth year.
Metric definitions
- Contest. A single scheduled match between two judoka under IJF rules. Bye rounds are not contests.
- Win rate. Wins divided by total contests, expressed as a percentage. A win is any contest in which the athlete is recorded as the winner, whether decided by ippon, waza-ari, accumulated waza-ari, or opponent hansoku-make.
- Ippon wins. Contests won by a full ippon score. Wins by two waza-ari are counted separately.
- Waza-ari wins. Contests won with one or two waza-ari and no ippon.
- Ippon rate. Ippon wins divided by total wins — an athlete-level measure of finishing decisiveness.
- Division quartile. An athlete’s win rate placed on the distribution of all athletes in the same weight class with at least five recorded contests. The labels elite, established, and developing correspond to the top quartile, interquartile range, and bottom quartile.
Update cadence
The underlying contest table is refreshed weekly, with additional targeted refreshes after major events. When an event is added, only the pages whose numbers changed are regenerated — athlete totals, the affected weight class, the athlete’s country, and the relevant edition. Every entity page displays a “last updated” date so readers can see when the numbers were last recomputed.
What we do not do
We do not estimate, interpolate, or model missing data. If a contest is not in the source feed, it does not appear on our pages. We do not publish predictions, injury speculation, or biographical information beyond what the competition record contains.