A default that hides the gap
The ten-point must system asks a judge to give the round's winner ten points and the loser nine, unless something exceptional happens such as a knockdown. That default is simple to apply live, which is its main virtue, but it treats a round won by a single clean jab the same as a round won by a sustained beating. Both become 10-9. The system was built for speed and consistency across three separate judges, not for capturing how one-sided a round actually was, and that trade-off shapes almost everything that looks strange about a final scorecard.
Why totals can mislead
Add twelve rounds of 10-9 swings together and a fight that felt lopsided to a viewer can still finish 116-112, a margin that looks close on paper. The viewer is remembering intensity; the scorecard is only counting rounds won. This gap between remembered dominance and arithmetic is the single most common source of disputed decisions, more so than any judge favouring one fighter unfairly. The maths simply cannot express what people watched.
Knockdowns as the exception
The system's one release valve is the knockdown, which typically drops a round to 10-8 and lets a judge register a genuinely bad three minutes without abandoning the shared scale. Fighters and corners know this, which is why a fighter well behind on work rate will still hunt a single flush shot late in a round: it is worth more to the card than several minutes of accumulated jabs. Understanding this incentive explains a great deal of tactical behaviour in the championship rounds of close fights.