- Bosma chess. King that is attacked three or more times is not considered to be in check. Fairy chess problem theme.
- Refusal chess. A problem.
- Using chess sets to play mini-sukoku (6x6). Missing description (8x8, Cells: 64)
|1 'Game' entry listed||2 'Problem' entries listed|
|3 'Solitaire game, puzzle or chess problem' entries listed|
Total items listed: 3