LA STRATEGIE, monthly chess magazine founded in 1867 by Jean Preti, Paris, 23 X 14 cm N°5, 64th year, May 1930 Results of the international chess tournament played from May 11 to 17 at the Cercles du Palais Royal N°6, 64th year, June 1930 Game Duchamp – Znosko Borowsky at the Paris Tournament N°7, 64th year, July 1930 Game Marshall – Duchamp at the Hamburg Tournament
