BOSTON�The UMBC softball team (19-14, 4-5 AE) rallied from a three-run deficit to send the game into extra innings, but a walk-off home run by Boston University first baseman Chelsea Kehr in the eighth gave the host Terriers (20-12, 6-3 AE) a 5-3 victory in the rubber match of the three-game series Sunday afternoon at BU Softball Field.