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The trick to understanding the rules of judo is to learn the terminology. Whether you are just learning the techniques or fighting an opponent in the ring, you must know the basic throws and their scores. An ippon is the biggest score in the game and can be achieved in a number of ways, one of which is by scoring two waza-ari – when an opponent is thrown without achieving ippon or is held down for 15-20 seconds – against an opponent. For more details, read about the terms and rules at British Judo.

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The Telegraph