Starts with the letter 'O'
- On Designing Good Chess Variants. Design goals and design principles for creating Chess variants. Author: Fergus Duniho.
- Omega Chess. This preset for Omega Chess enforces the rules and spots check, checkmate, and stalemate. Author: Fergus Duniho.
|1 'Play by mail item' entry listed||1 'Miscellaneous item' entry listed|
|1 'Large board' entry listed|
Total items listed: 2