Quote:
7.01 A runner acquires the right to an unoccupied base when he touches it before he is out. He is then entitled to it until he is put out, or forced to vacate it for another runner legally entitled to that base.
Rule 7.01 Comment: If a runner legally acquires title to a base, and the pitcher assumes his pitching position, the runner may not return to a previously occupied base.
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Wiping off a run that has legally scored seems to be more difficult than immediately reinstating the force play once the pitcher has the ball.