Mezue ahịrịokwu na-esonụ: Site na ngwụcha afọ 1930 ruo n'isi mmalite afọ 1940, Stoffels bụ otu n'ime ndị na-egwu egwuregwu bọọlụ nwanyị na Belgium. O meriri Belgian Women's Chess Championships ugboro ise: na 1938, 1939, 1940, 1942 na 1944. O sonyere ọtụtụ oge na asọmpi egwuregwu Antwerp "De Zilveren toren" na Antwerp chess club "Het schaakbord" site na 1929 ruo 1934. N'afọ 1939, Stoffels sonyere na
Women's World Chess Championship 1939 na Buenos Aires, ebe ọ nọrọ na 16th.