Luis Roberto (Ruben) Piazzini (11 May 1905 – 4 March 1980) was an Argentine chess master.
[2] In 1934, he tied for 7-8th in Mar del Plata International Chess Tournament (Aaron Schwartzman won).
[3] In 1934/35, he won South American Chess Championship in Buenos Aires.
[4] In 1936, he tied for 9-10th in Mar del Plata (it, Isaías Pleci won).
In 1952, he won the Club Argentino de Ajedrez Championship in Buenos Aires.