Parallel worlds chess is a three-dimensional chess variant invented by R. Wayne Schmittberger in the 1980s.[1][2][3] The gamespace comprises three 8×8 chessboards at different levels. Each side commands two full chess armies on levels 1 and 3. Level 2 begins empty and obeys its own move rules.
- ^ Schmittberger (1992), pp. 106–07
- ^ Pritchard (1994), p. 218
- ^ Pritchard (2007), p. 227