Qoraa sii wadida faqradan - Laga soo bilaabo dabayaaqadii 1930-meeyadii ilaa horraantii 1940-meeyadii, Stoffels waxay ahayd mid ka mid ah ciyaartooyda isreebreebka dumarka ah ee ugu caansan Belgium. 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, Stoffels waxay ka qeyb gashay Horyaalka Haweenka Adduunka ee Chess 1939
waxay ku dhameysatay kaalinta 16-aad.