The name “Ruy Duarte (pentathlete)” does not correspond to a widely recognized individual in publicly available encyclopedic sources. No reliable records, biographical entries, competition results, or authoritative references have been identified that confirm the existence of a notable modern pentathlete or pentathlete by this name.
Because of the lack of verifiable information, the term is not established in the context of sport history, Olympic participation, or major pentathlon organizations. Any further discussion would be speculative and therefore is omitted.