 In 1923, he took 6th in Copenhagen (Aron Nimzowitsch won).His name is attached to the Møller Attack in the Giuoco Piano (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 ed4 6.cd4 Bb4+ 7.Nc3 Nxe4 8.O–O Bxc3 9.d5) and the Møller Defense in the Ruy Lopez (1.e4 e5 2.Nf3 Nc6 3.