Buuxi weedhan soo socota: Laga soo bilaabo dabayaaqadii 1930-meeyadii ilaa horraantii 1940-meeyadii, Stoffels waxay ka mid ahayd ciyaartooyda ugu caansan dumarka chess-ka ee Belgium-ka. Waxay ku guuleysatay Horyaalka Belgian Women's Chess shan jeer: 1938, 1939, 1940, 1942 iyo 1944. Waxay dhowr jeer ka qeyb gashay tartankii kooxaha ee Antwerp "De Zilveren toren" oo ay la gashay kooxda chess-ka ee Antwerp "Het schaakbord" laga soo bilaabo 1929 ilaa 1934. Sanadkii 1939-kii, Stoffels wuxuu ka qeyb galay
Horyaalka Haweenka Adduunka ee Chess 1939 ee Buenos Aires, halkaas oo ay ku dhammeysay kaalinta 16-aad.