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My belief is that on almost every bridge hand there is a point of time a trick when the action of a bridge player is decisive for the fate of the contract. The spotlight is on him. What he is doing the rest of the time is not decisive as long as he does not do anything foolish. I call that point the 'kill point'. If you are clever at spotting kill points you are a strong player and you will gain yet more strength from being able to relax the rest of the time.