I think you need a circle, and you need a rule that says you have to stop the advance of the lead runner. Then get the ball inside the circle and any runners, who are not the lead runner, who have not made it to halfway the next base must go back. If the lead runner has stopped, and you get the ball in the circle then runners who have not made it halfway go back. If you don't have to stop the lead runner then the defensive strategy becomes "get the ball in the circle" which is not teaching the kids the game.
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