Paul Vaitonis vs Luis Roberto Piazzini
Buenos Aires Olympiad fin-A Buenos Aires ARG round 1 1939.09.01
Slav Defense 0-1

Rene Letelier Martner vs Luis Roberto Piazzini
Mar del Plata it-03 Mar del Plata ARG round 1 1936.03.12
Slav Defense: Czech Variation 0-1

Luis Roberto Piazzini vs Rodrigo Flores Alvarez
Mar del Plata it-03 Mar del Plata ARG round 10 1936.03.24
Semi-Slav Defense: Bogoljubov Variation 1-0