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Little should be done (other than perhaps a warning) in a live game. I personally don't mind the tactic as long as it's heads up and not multi-way, though I am not suggesting it as the BEST course of action.

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Actually something should be done though it might only be a warning. In the case being discussed Player A shows his hand to player B before player B is to act on the raise by the OP. Player B folds. perhaps Player B would not have folded if he didn't see player A's cards. We will never know.

You might not mind this tactic Al, but I certainly do.