She won two matches against Sonja Graf for the Women 's World Champion title ; ( +3 − 1 = 0 ) at Rotterdam 1934 , and ( +9 − 2 = 5 ) at Semmering 1937 .
In addition , Menchik won two matches against her rival Sonja Graf for the Women 's World Champion title ; ( +3 -1 = 0 ) at Rotterdam 1934 , and ( +9 -2 = 5 ) at Semmering 1937 .