<prompt> Andika mwendelezo wa aya hii - Yepez alikuwa sehemu ya ujumbe wa Ecuador katika Michuano kadhaa ya Kimataifa na Mashindano: 16th Chess Olympiad ya Tel Aviv 1964, 17th Chess Olympiad ya Havana 1966, 18th Chess Olympiad  <response>: Lugano 1968, Open Tournament ya Nice - 1974 Capitan, Panamerican Tournament ya Havana, 1968, II Tournament Apertura - Bogotá, 1970, Tournament Ecopetrol - El Tiempo - Bogotá, 1970, VIII Caribbean na Amerika ya Kati Zone Tournament FIDE, Bogotá 1972. 