Starts with the letter 'O'
- Once More, with Deans. Subvariants of River-with-university-and-cathedral series with extra piece type. By Charles Gilman.
- Ouk Chatrang (Cambodian Chess) . Part of a document describing various Historical Chess Variants. Author: Nader Daou.
|2 'Game' entries listed||1 'Large board' entry listed|
|1 'Small board' entry listed||1 'Three or more players' entry listed|
|1 'From ancient times' entry listed||2 'Xiangqi, or Xiangqi-based' entries listed|
|1 'Shogi, or Shogi-based' entry listed|
Total items listed: 2