 His report referred to the "finger-four" formation as the clearly superior tactical formation for contemporary fighter operations.Lützow's comrade Werner Mölders solved the problem of manoeuvring a "finger-four" formation months later by introducing what is still known today as the "crossover turn" or "tac turn".At RLM, Lützow received his promotion to "Hauptmann" (captain) on 20 November 1937.