Mondo Knows Facts

An ippon ends a judo contest at once

A clean throw onto the back, a 20-second pin or a submission all score it Two waza-ari scores also add up to an ippon, and a single waza-ari used to be enough in some eras before the rule changed. Contests at the elite level last four minutes, with a golden score period if the score is level. A penalty known as hansoku-make disqualifies a fighter outright. It sits in Mondo's sports collection, one of 200 facts that each trace back to the reference below.

Where this comes from

International Judo Federation

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Tags: judo, scoring, rules

An ippon ends a judo contest at once: the short answers

Where does this come from, and can I check it?
A clean throw onto the back, a 20-second pin or a submission all score it. The figure is taken from International Judo Federation, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a sports fact?
Yes. It sits on the Sports shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?
The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.