Starts with the letter 'U'
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- Using chess sets to play mini-sukoku (6x6). Missing description (8x8, Cells: 64) By Karen Robinson.
- Upside-Down Chess. White starts at the upper two rows, black at the bottom. (8x8, Cells: 64)
- Upgrade chess. Upgrade initially weak pieces by capturing. (8x8, Cells: 64) By Daniil Frolov.
- Upchess. Pieces moves depend on which rank piece is on on 11 by 11 board. (11x11, Cells: 121) By Mark Leff.
- UOS (Universal Origin Spiel). Variant on a board with 113 diamond-shaped spaces. (Cells: 113) Inventor: Gerhard Loos.
- Unreliable Delivery Chess. Pieces may get delayed before they arrive at their destinations. Inventor: Ralph Betza.
- Unreal Tournament Chess. Chess variants with a different objective, inspired by the multiplayer computer game Unreal Tournament. (8x8, Cells: 64) By João Pedro Neto.
- Unknown Off-Pieces Shogi. Pieces placed from outside of the board are unknown to opponent. (9x9, Cells: 81) By (zzo38) A. Black.
- Unknown Drop Shogi. It is unknown what kind of piece your opponent dropped. By (zzo38) A. Black.
- Universal Chess. Missing description (8x8, Cells: 64) By Carlos Cetina.
- Univers Chess. A Carrera's Chess variant based on Bruno Violet's Universal Chess. (10x8, Cells: 80) By Fergus Duniho.
- Unirexal Chess. Only white has a king. Inventor: Vernon Rylands Parton.
- Unionschach, Sachsenschach, and Leapale. Some 3D Chess variants. (6x6x6, Cells: 216) By Charles Gilman.
- Unidirectional arrays on standard boards. Both players in the same direction, as Viking Chess, but on boards of correspondiyng face-to-face variants. By Charles Gilman.
- Unicorn Great Chess. Lions have been added to Unicorn Chess! (10x10, Cells: 100) By David Paulowich.
- Unicorn Chess. 10x10 variant with a new piece that moves as a Bishop or a Nightrider. (10x10, Cells: 100) By David Paulowich.
- Uneven pieces chess. The two armies have their back rank material distributed in different ways, discouraging trades. (10x8, Cells: 80) By Andrew L Smith.
- Undenary Chess. Large variant with superpowerful King; a square version of Hexmate. (11x11, Cells: 121) By Michael A. Rouse.
- Undecided Chess. Undecided Pawns can change into pieces by moving like them. (8x8, Cells: 64) By Adrian Alvarez de la Campa.
- Unconventional Warfare Chess. Variant based on modern warfare. (10x10, Cells: 84) By Luiz Carlos Campos.
- Unbland Chess. Diagonal moves are usually (but not always) prohibited. (8x8, Cells: 64) By (zzo38) A. Black.
- Unashogi. Parachute all pieces, starting with an empty board. (9x9, Cells: 81) By Edward Jackman.
- Unachess II. Start with empty board and begin with dropping pieces. (8x8, Cells: 64) By Edward Jackman.
- Unachess. Start with empty board and begin with dropping pieces. (8x8, Cells: 64) Inventor: Jeff Miller and Edward Jackman.
- Ultrachess. Chess variant with two queens on 9 by 8 board. (9x8, Cells: 72)
- Ultra Slanted Escalator Chess. Game on an asymmetrical board of 84 squares with Crabs and Ultras. (10x9, Cells: 84) By David Short.
- Ultra Chess. On 10 by 10 board with two queens, and major pieces have an additional king's move. (10x10, Cells: 100) By Ruggero Micheleto.
- Ultimate Hexagonal Chess. Hexagonal chess that has no equal. By Max Koval.
- Ultimate Battle Chess. Pawns, kings, queens, and knights move differently. (8x8, Cells: 64) By Vu Q Vo.
- Ultima. Robert Abbott's Ultima page. By Robert Abbott.
- Ultima. Game where each type of piece has a different capturing ability. (8x8, Cells: 64) (Recognized!) Inventor: Robert Abbott.
- Ulchesgi. Like Ultima and Chess and Shogi. (12x8, Cells: 96) By (zzo38) A. Black.
- UC-170-13. Universal Chess version featuring 170 different kind of major pieces and 13 different kind of pawns. (8x8, Cells: 64) By Carlos Cetina.
- Ubi-ubi chess. Experimental variant with powerful Knights. (8x8, Cells: 64) Inventor: Koen Versmissen.
- U12 Shogi. A new kind of large shogi game. (12x12, Cells: 144) By (zzo38) A. Black.
- U-Chess. Moves are legal if they can be written with three symbols in descriptive notation. (8x8, Cells: 64)
- Ultimate Shogi. Taikyoku Shogi. Extremely large shogi variant. (36x36, Cells: 1296)
- Unachess III. Start with empty board and begin with dropping pieces. (8x8, Cells: 64) By Edward Jackman.
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Total items listed: 38