In France, Tartakower decided to become a professional chess player. He also started cooperating with various chess magazines, and wrote several books and brochures on chess. The most famous of these, "Die Hypermoderne Schachpartie" ("The Hypermodern Chess Game") was published in 1924 and has been issued in almost 100 editions since. Tartakower took part in many of the most important chess tournaments of his day. In 1927 and 1928 he won two tournaments in Hastings and shared first place with Aron Nimzowitsch in London. On the latter occasion, he defeated such notable players as Frank Marshall, Milan Vidmar, and Efim Bogoljubov. In 1930 he won the Liège tournament, beating Mir Sultan Khan by two points. Further down the list were, among others, Akiba Rubinstein, Nimzowitsch, and Marshall.