She finally lost her crown in 1978 to another Georgian , Maia Chiburdanidze , by a score of 6 Â 1\/2 â `` 8 Â 1\/2 ( +2 â ' 4 = 9 ) . She finally lost her crown in 1978 to another Georgian , 17-year-old Maia Chiburdanidze , by a score of 6 Â 1\/2 â `` 8 Â 1\/2 ( +2 â ' 4 = 9 ) .