There are 2 umpires, the batters umpire and the bowlers umpire.
Batters umpire:
Calls no balls
Stands where they can see batter and first post
Calls 'out' if the batter is out
Watches for catches
Calls a rounder when batter touches fourth post
Calls half rounders
Calls backwards hit
Watches front line of bowlers box for fouls
Watches bowlers wrist movement
Watches front and back lines of batters box for fouls
Calls obstruction.
Bowlers umpire
Calls play to begin the game
Calls 'no balls'
Make final decisions
The umpires will swap positions on the pitch in the intrest of fairness to the game
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The official doesn't take scores, that is the one of the jobs for the players. The umpire looks for no balls and faults and if he thinks there is a fault he will call.
When a rounder or a half-rounder is scored the umpire shouts 'half rounder' or 'rounder' if scored.