Starts with the letter 'O'
- Omega Chess Extended . Missing description By Mykola Dolgalov.
- Oxybeles Chess. Introducing the exceptional Oxybeles piece, which can hurl pieces over its head, on a Gustavian board (zrf available). By M Winther.
|1 'Game' entry listed||1 'Zillions of Games file' entry listed|
|2 'Large board' entries listed||1 'Unorthodox shaped board' entry listed|
|2 'In a category all its own' entries listed|
Total items listed: 2