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- Octa-Ashtapada. 8x8x8 variant with powerful armies and the potential for multiple royal pieces per side. By Larry L. Smith.
- Octahedral Chess. 3d-board in octahedral form. (x9, Cells: 340) Author: Hans L. Bodlaender and Michael D. Ward. Inventor: Michael D. Ward.
- OctHex 146. Arranging the geometry of Tetrahedral Chess into an octahedron. (Cells: 146) By Charles Gilman.
- Odalisque Chess. Magnetic rotating three dimensional chess variant. (1x4x16, Cells: 64) By Robert J. Bell.
- Óskar's 3dchess. Missing description (8x8x5, Cells: 320) By Hafsteinn Kjartansson.
- Óskar's 3dchess version 2. Missing description (8x8x5, Cells: 320) By Hafsteinn Kjartansson.
5 'Game' entries listed 1 'Zillions of Games file' entry listed 6 'Three dimensional' entries listed 1 'Large board' entry listed 1 'Unorthodox shaped board' entry listed 1 'Board with hexagonal shaped cells' entry listed
Total items listed: 6