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Raumschach. The classical variant of three-dimensional chess: 5 by 5 by 5. (5x5x5, Cells: 125) (Recognized!)[All Comments] [Add Comment or Rating]
octarinebean wrote on 2021-12-12 UTC

I found the book from the inventor describing the game in 1919:

https://core.ac.uk/reader/14514151.

He gives multiple versions of the starting position and rules for pawn movement, as well as also describing some 4x4x4 and 7x7x7 variants. The version this article covers is the 10 pawn version (C3) of type C "Neue", which Maack calls the normal way to play. There is also the type A "alte" with pawns only on the γ level, and the type B "vier Einhörnern" where each side has four unicorns, but only one rook and knight, in order to span the whole board with each piece. All of the diagrams in the book show point reflection symmetry, not rotation symmetry, between the two sides, contrary to this article. The type B "reduzierte" pawn movement which the author prefers is disliked by Maack, in favor of the type C "neue" pawn which includes the forward-and-vertical capture.

Please make good use of this primary source, which, it seems, no one until now has found.