Umpires warned England batsman Kevin Pietersen twice for changing stance to attempt a switch hit during the second Test against Sri Lanka on Thursday.

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The flamboyant Pietersen was spoken to by Bruce Oxenford and Asad Rauf after bowler Tillakaratne Dilshan had to stop twice in his run-up as the batsman turned around in his stance.

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The laws of the game say that the switch hit -- a right-hander playing a shot with a left-hander's grip -- is legal but a batsman cannot change stance before the bowler has delivered the ball.

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