Power is always measured in units of comparison. In fact, it is a term of competition: How much resistance can I overcome relative to others? Power is a concept that belongs only in finite play. But power is not properly measurable until the game is completed—until the designated period of time has run out. During the course of play we cannot yet determine the power of the players, because to the degree that it is genuine play the outcome is unknown. A player who is being pushed all over the field by an apparently superior opponent may display an unsuspected burst of activity at the end and
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