This trick will only work if it is raining. It does not matter if the bases are full or empty, but do not do this with a man on third base, as the pitcher will throw home, which results in an out. Also, do not use a slow-running batter. Have the batter bunt the ball. Because it is raining, the mud will keep the ball from rolling much. The AI will have the pitcher get the ball, rather than the catcher who is much closer. By the time the pitcher gets the ball to first base, your runners will be safe.