Kohtz Johannes (18.07.1843 - 05.10.1918)
German composer born in Poland. Chess historian.
One of the founders of the New German (Logical) Chess Composition School. Kohtz used two pseudonyms: "Alfred Wiedemann" and "J. Kuck".
The co-author with Carl Kockelkorn of the famous book «Das Indische Problem” (Potsdam, 1903).