 In 1935, he became "Reichstrainer des Großdeutschen Schachbundes" (Chief Trainer of the German Chess Federation).Schlage, with Alexander Alekhine and Efim Bogoljubow, trained the German national team for 3rd unofficial Chess Olympiad at Munich 1936.In August 1939, he trained the best young German players (Klaus Junge (15 years old), Wolfgang Unzicker (14), Edith Keller (17), Karl Krbavic (17), Rudolf Kunath (15), etc.)