Rubuta ci gaba don wannan sakin layi - Yepez ya kasance wani ɓangare na tawagar Ecuador a cikin Gasar Cin Kofin Duniya da Gasar Duniya da yawa: 16th Chess Olympiad na Tel Aviv 1964, 17th Chess Olympiad
na Havana 1966, 18th Chess Olympiad na Lugano 1968, Open Tournament na Nice - 1974 (Capitan), Panamerican Tournament na Havana, 1968, II Gasar "Apertura" - Bogotá, 1970, Gasar "Ecopetrol - El Tiempo" - Bogotá, 1970, VIII Caribbean da Amurka ta Tsakiya Gasar FIDE, Bogotá <unk> 1972.