Ferdinand Maack (1861–1930) was a German doctor, inventor and occultist. He invented Raumschach, the classic 3D chess game, first described by him in the Frankfurter Zeitung in 1907. He promoted the game with demonstrations, articles, specialist magazines and several books. He founded the Hamburg Raumschach Club in 1919, which remained active until World War II. Notes References Bibliography External links 1861 births 1930 deaths Chess variant inventors 20th-century German inventors 20th-century German physicians