obstruction

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I agree with Dave. I can't see anyway that you would award 3rd base to R1 since she was obstructed heading back towards 2nd. She had given up trying to get to 3rd and was trying to get to 2nd. Giving her 3rd would be foolish. Since you can't have two runners legally occupy the same base, R2 must return to 1st. If the coach continues to argue, tell him "fine, if she's (R2) on 2nd at the time the pitch leaves the hand, I'll call her out for leaving 1st early" and see what he would like you to do at that point. My guess, he'll take runners on 1st and 2nd.