Cika wannan jumla:
Wasannin Afirka na 1973 a Legas, Nwankpa ya halarci gasar nauyi mai nauyi. Ya lashe lambar zinare, inda ya doke Issake Dabore na Nijar a wasan karshe. Ya kuma lashe lambar zinare a cikin rukunin nauyi mai nauyi a Wasannin Commonwealth na 1974 na Burtaniya, inda ya kayar da Anthony Martey na Ghana a wasan karshe.