Devos was seven times Belgian Champion (1933, 1936, 1937, 1940, 1941, 1945, and 1948). He took 2nd, behind Boruch Israel Dyner, at Brussels 1933 but won the title as a player of the Belgian nationality. In 1936 he won international BEL-ch, and took 3rd in national BEL-ch, both in Brussels. In 1937 he shared 1st with Alberic O'Kelly de Galway and drew a play-off match for the title (1.5 : 1.5).
He took 3rd at Brussels 1937 (Quadrangular), behind O'Kelly and Movsas Feigins and ahead of Emil Joseph Diemer, tied for 11–12th at Hastings 1945/46 (Savielly Tartakower won), tied for 9–11th at London 1946 (B tournament, Max Euwe won), and shared 2nd, behind Euwe, at Maastricht 1946.
Devos played twice for Belgium in Chess Olympiads; at Folkestone 1933 and Dubrovnik 1950. He also represented his country in friendly matches against The Netherlands (1947, 1950, 1959) and France (1948, 1949).
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