Traditionally, a human judge decides whether a blow is accurate or powerful enough to count as a point -- but sometimes a judge misses a move.

CNN: High-tech blow for martial arts

The Blues failed to make their numerical advantage count, but they delivered the telling blow five minutes from time with a superb counter-attack.

BBC: Bath 6-14 Blues

Sprott looked to be gaining an advantage but he was checked by a count late in the fourth round after taking a low blow.

BBC: SPORT | Boxing | Williams retains titles