Buuxi weedhan soo socota: Wuxuu ka maqnaa xilli ciyaareedkii 1975 laakiin wuxuu ku soo laabtay ficilkiisa isagoo ku guuleystay horyaalkii dalka Belgium ee 1976. Wuxuu ku guuldareystay inuu ku celiyo guushiisii hore ee 1976 IAAF World Cross Country Championships, isagoo soo galay kaalinta 49aad, in kasta oo Belgium ay qaadatay billado lacag ah kooxda. Kooxdiisa Léon Schots ayaa ku guuleystay dahabka
1977 IAAF World Cross Country Championships iyo De Beck oo kaalinta 18-aad galay ayaa arkay isaga oo qayb ka ah horyaalka kooxda markii saddexaad ee xirfadiisa. Markii 1970-yadii ay soo dhawaatay, waxqabadka kooxda reer Belguim ayaa hoos u dhacay: De Beck wuxuu ahaa 26-aad tartamada 1978 iyo 1979, iyadoo Belgium ay kaalinta shanaad ka gashay tartamada labadaba. Ka dib markii uu ka maqnaa xilli ciyaareedkii 1980, wuxuu ahaa kaliya 64aad 1981. Wuxuu ahaa ciyaaryahankii ugu fiicnaa ee dalkiisa ka ciyaaray 1982 iyo 1983 World Cross Country Championships, isagoo dhammeystiray 17-aad mar kasta.