Maack

Raumschach (in German, "space chess") is a modality of chess invented in 1907 by Ferdinand Maack. It adds a third dimension to the board.

Source: tatoeba (9968812)

The inventor Ferdinand Maack wanted to make chess look like a modern war, with possible attacks not only on a two-dimensional surface, but also from the air and from under the water.

Source: tatoeba (9969411)