@Joe Joyce: I will look into my many books and articles what my sources are. Right now I have "A Guide to Fairy Chess" from Anthony Dickins in hands where some details about 4D-chess by Maack and by Dawson are given and commented.
Of course, Pritchard has also listed Maack's:
Maack’s Four-dimensional Chess (Ferdinand Maack, 1926 or earlier). Maack added an extra dimension to his game to create a board 4x4x4x4 which, whilst appealing to problemists, failed to recruit players. (Chess
Amateur, December 1926)
@Joe Joyce: I will look into my many books and articles what my sources are. Right now I have "A Guide to Fairy Chess" from Anthony Dickins in hands where some details about 4D-chess by Maack and by Dawson are given and commented.
Of course, Pritchard has also listed Maack's: Maack’s Four-dimensional Chess (Ferdinand Maack, 1926 or earlier). Maack added an extra dimension to his game to create a board 4x4x4x4 which, whilst appealing to problemists, failed to recruit players. (Chess Amateur, December 1926)