Grau played in many Argentine championships. In 1921/22, he tied for 3rd-4th (ARG-ch 1 Mayor; Damian Reca won). In 1922, he tied for 2nd-3rd (ARG-ch 2; Benito Villegas won). In 1923/24, he tied for 2nd-4th (ARG-ch 3; Reca won). In 1924, he took 2nd, behind Richard Réti (ARG-ch 4).
In 1926, he won in Buenos Aires (ARG-ch 5) and won a match for the title against Reca (6 : 2). He was also Argentine Champion in 1927 and 1928. He won a match against Isaias Pleci (4 : 0) in 1929, lost matches to Pleci (3 : 5) in 1930, and Carlos Guimard (2 : 6) in 1937. Grau won again Argentine championships in 1934 and a match against Luis Piazzini (7,5 : 5,5) in 1935 (ARG-ch 13), in 1935 and a match against Jácobo Bolbochán (5 : 3) in 1936 (ARG-ch 14), in 1938 and a match against Guimard (7,5 : 5,5) in 1939 (ARG-ch 17).
In tournaments, he won in 1921/22 at Montevideo (1st Torneo Sudamericano). In 1923, he won in Buenos Aires. In 1924, he took 2nd, behind Max Euwe, in Paris. In 1925, he tied for 2nd-3rd with Reca, behind Luis Palau, in Montevideo. In 1928, he won in Mar del Plata (1st it). In 1929, he won in Rosario. In 1930, he tied for 2nd-3rd in Buenos Aires (Virgilio Fenoglio won). In 1930, he took 5th in Buenos Aires (Bolbochán won). In 1930, he took 15th in San Remo (Alexander Alekhine won).
In 1934, he took 2nd, behind Aaron Schwartzman, in Mar del Plata. In 1934/35, he took 5th in Buenos Aires (Piazzini won). In 1938, he tied for 5-6th in Montevideo (Carrasco). The event was won by Alekhine. In 1939, he took 4th, behind Fenoglio, Guimard and Julio Bolbochán, in Rio de Janeiro. In 1939, he took 7th in Buenos Aires (Miguel Najdorf and Paul Keres won).
Grau played for Argentina in Chess Olympiads.
He was one of the original signers in the formation of FIDE at Paris 1924 (1st unofficial Chess Olympiad).
He also wrote a four volume series on chess titled "Tratado General de Ajedrez" (General Treatise on Chess), first published in 1940.
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