Starts with the letter 'U'
- Ultra Slanted Escalator Chess. Game on an asymmetrical board of 84 squares with Crabs and Ultras. (10x9, Cells: 84) By David Short.
- Ultra Slanted Escalator Chess . Game on an asymmetrical board of 84 squares with Crabs and Ultras. Author: Peter Aronson. Inventor: David Short.
- Unconventional Warfare Chess. Variant based on modern warfare. (10x10, Cells: 84) By Luiz Carlos Campos.
- Unconventional Warfare Chess . Variant based on modern warfare. Author: Dan Troyka. Inventor: Luiz Carlos Campos.
- Undenary Chess. Large variant with superpowerful King; a square version of Hexmate. (11x11, Cells: 121) By Michael A. Rouse.
- Unicorn Chess. Unicorn Chess with one queen, two cardinalriders and two marshalls. Author: Jeremy Gabriel Good. Inventor: David Paulowich.
- Unicorn Great Chess. Lions have been added to Unicorn Chess! (10x10, Cells: 100) By David Paulowich.
|4 'Game' entries listed||2 'Zillions of Games file' entries listed|
|1 'Play by mail item' entry listed||6 'Large board' entries listed|
|2 'War game' entries listed||2 'Unorthodox shaped board' entries listed|
Total items listed: 7