it's the 10 point must system.
the winner of a round gets 10 points, so if you can't separate who won a round you will score it 10 -10, or 10 - 9 for a decisive win, 10 - 8 for a knockdown, and possibly at your discretion, score it 10 - 7 for 2 knockdowns.
you also have to (on the ref's instructions) deduct points for fouls.
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the winner of the round gets 10 points and the other fighter will get 9 points or lower