competition area [1]
Smooth wooden floor on which the kendo bout takes place; a bout usually lasts five minutes.
scorekeepers 
One of two officials who register the contestants’ points and penalties, as given by the referee.
timekeeper 
Official who monitors the duration of the bout.
assistant referee 
One of two officials who assist the chief referee and are involved in scoring the contestants, using flags.
chief referee 
Official who enforces the rules, directs the bout and awards the points and penalties to the contestants.