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Movement by wicket-keeper


"I was watching a game in which the bowler and the wicket-keeper were obviously very well used to playing in the same team. The 'keeper seemed to know just when his colleague, who usually bowled medium fast, was going to slip in a slower ball, and would take a step or two towards the stumps from his usual wicket-keeping position. On one occasion, though, the bowler was obviously going to bowl a very much slower ball. While he was running in to bowl, the 'keeper ran right up to the stumps, whereupon the umpire at square leg called Dead ball. Why?"

Because the striker is entitled to know where the fielders are stationed before the ball comes into play. A step or two forward by the wicket-keeper is deemed permissible, but such 'significant movement' as you describe is considered unfair. Either umpire can call and signal 'Dead Ball'

Read more about Law 27.4 (The wicket-keeper) at the MCC website