Starts with the letter 'U'
- Ultra Chess. On 10 by 10 board with two queens, and major pieces have an additional king's move. Author: Pavel Tikhomirov. Inventor: Ruggero Micheleto.
- 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. Author: Dan Troyka. Inventor: Luiz Carlos Campos.
- Unicorn Chess . 10x10 variant with a new piece that moves as a Bishop or a Nightrider. Author: Fergus Duniho. Inventor: David Paulowich.
|4 'Zillions of Games file' entries listed||4 'Large board' entries listed|
|1 'War game' entry listed||1 'Unorthodox shaped board' entry listed|
Total items listed: 4