Game Courier Presets
- Undecided Chess. Undecided Pawns change into orthodox pieces by moving like them. By Adrian Alvarez de la Campa.
- Unicorn Chess. Unicorn Chess with one queen, two cardinalriders and two marshalls. Author: Jeremy Gabriel Good. Inventor: David Paulowich.
- Universal Chess. http://www.chessvariants.org/index/msdisplay.php?itemid=MSuniversalchess. By Carlos Cetina.