- Double Diamond. Pieces start diagonally across from one another and pawns move diagonally. Author: Jeremy Gabriel Good. Inventor: Jim Aikin.
- Double Diamond . Irregular board with diagonal orientation. Author: Peter Aronson. Inventor: Jim Aikin.
- Double Diamond. Irregular board with diagonal orientation. (9x9, Cells: 73) By Jim Aikin.
|1 'Game' entry listed||1 'Zillions of Games file' entry listed|
|1 'Play by mail item' entry listed||2 'Large board' entries listed|
|2 'Unorthodox shaped board' entries listed||1 'In a category all its own' entry listed|
Total items listed: 3