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- Khmer Chess:Kar Ouk . First check the opponent's Khun (King) , you win the game. By Yu Ren Dong.
- Ki Shogi. Variant of Shogi played without a board, and pieces are cubes. By Larry L. Smith.
- King and Queen . Variant on cross-shaped board with 39 squares. Author: David Howe. Inventor: Dennis Xay Voong.
- King Arthur's Chess 72 . Chess on a round board,. The odd number of files allows the Bishops to access every cell on the board - not colour-bound. By David Cannon.
- King to Bunker Leap . Includes Shuffle Chess and pre-Chess with new “bunker leap” king safety rules. By Charles Daniel.
- King with a Shotgun . Twice each game, the King can make a non-moving Rook capture. Author: Peter Aronson. Inventor: Adam Norberg.
- King's Court . Variant on 8 by 12 board with Chancellors and Jesters. Author: Jens Markmann. Inventor: Sidney LeVasseur.
- King's Leap Chess. Variants with Chancellors (Knight+Rook) and old Russian Queens (Knight+Queen). By David Paulowich.
- King's Run . An entry for the 32-turn contest that is based on Logan's Run. By Fergus Duniho.
- Kinglet . Win by taking all the pawns of the opponent. Author: Uwe Wiedemann. Inventor: Vernon Rylands Parton.
- Kings and Pawns . Proprietary game on 8 by 7 board with two types of pieces and no capturing. Author: Peter Aronson.
- Kings or Lemmings?. Normal chess except that a player can produce clones of his king.
- Klin Zha . Chesslike game played by Klingons from Star Trek on triangular board. Author: Larry L. Smith. Inventor: Leonard B. Loyd Jr..
- Klin Zha . Chesslike game played by Klingons from Star Trek on triangular board. Author: Jean-Louis Cazaux. Inventor: Leonard B. Loyd Jr..
- Klin Zha 3D . A three dimensional form of Klin Zha. By Larry L. Smith.
- Knavish Shatranj . Shatranj style game on 8x8 board. Author: Christine Bagley-Jones. Inventor: Jörg Knappen.
- Knight Court. Mate the knight with three pieces per player on a three by three board. By Jason D. Wittman.
- Knight games (improved). Missing description By Namik Zade.
- Knight Scattering Chess. Knights can neither capture nor be captured, but instead can move opposing pieces a Knight's move away. Author: Peter Aronson. Inventor: Sergey Sirotkin.
- Knight-Tac-Toe . Win by placing 3 pieces in a row. By David Howe.
- Knightliest Black Hole . Knighted pieces on a constantly diminishing board. By João Pedro Neto.
- Knightmate-Relay Chess . Played with a royal-knight and special movement rules for pieces a knight's move away. By Peter Aronson.
- Knights games . Missing description By Namik Zade.
- The Knights Tour . Try to solve the knights tour problem with Zillions of Games. Author: Uwe Wiedemann.
- Knightsbridge . 14 knights against 14 knights on a 7 by 7 board. Author: Uwe Wiedemann.
- Kobayashi Maru. Variant of Star Trek 3D Chess. By Larry L. Smith.
- Kobayashi Maru Variant of ST3D Chess . A variant set of rules for playing chess using the 3 dimensionsal set featured on the TV series Star Trek. By Larry L. Smith.
- Kogbetliantz Game. One of the earliest 3D Chess games for the 8x8x8 playing field. Author: Larry L. Smith. Inventor: Dr. Ervand George Kogbetliantz.
- Koksal's Primitive Chess . Short-range major pieces and no pawns, but a piece like an apprentice for each major piece. Author: Marek14 . Inventor: Köksal Karakus.
- Korean vs Western Chess. Red pieces are from Korean Chess, black pieces are from Western Chess.
- Kozune. A game inspired by, and featuring elements of, Shatranj and Shogi. Author: Larry L. Smith. Inventor: Joshua Morris.
- Kozune Western . Missing description Author: Christine Bagley-Jones and Larry L. Smith. Inventor: Joshua Morris.
- Kriegspiel Zillions v 2.0 file . Zillions file to play Kriegspiel against the computer. The human player's pieces are not hidden. By Andreas Kaufmann.
- Kristensen's Game . A conscious attempt to restructure Chess from 1948. Author: Peter Aronson. Inventor: Ejnar Kristensen.
- Kung Fu Chess . On a 14x10 board, the pieces in this variant are based on Kung Fu martial arts styles of combat. By Tim Bostick.
- Ladder Chess . Chess variant on a `skewed' board with 40 squares. Author: Uwe Wiedemann. Inventor: Sergey Sirotkin.
- LancerChess (or LeopardChess). Missing description By Glenn Nicholls.
- Large Chess ZRF . ZRF for Capablanca's Chess plus variants: Bird's, Aberg's, Grotesque, Univers, Embassy, Janus, Archbishop, New Chancellor + more. Author: Fergus Duniho.
- Leandros Chess . You may make a non-capturing move with each of your pieces in one turn, or make a normal capturing move. By Tony Quintanilla.
- Leap Chess . Game with manditory captures and other Checkers-like elements on a board of 44 squares. By Ken Franklin.
- Leapers Chess. Played upon a 10x10 field with all the pieces having leaping capability. By Larry L. Smith.
- Leapers Creeepers. Decimal variant with many leaping pieces. By Christine Bagley-Jones.
- Legan's Chess . Normal set and board, different setup and pawn moves. Author: Marek14 . Inventor: L. Legan.
- Legan's Fortress Chess . On an `I` shaped board. Author: Marek14 . Inventor: L. Legan.
- Legler's Chess . Modest 1926 variant using an Archbishop and a Chancellor. Author: Peter Aronson. Inventor: Hugo Legler.
- Lemniscate Chess . Chess played on a Lemniscate board (in the shape of an infinity symbol). By David Cannon.
- Lemurian Shatranj . Missing description By Christine Bagley-Jones.
- Life, the Universe and Everything . 42-square double-move variant with unusual pieces, inspired by Douglas Adams' fiction. Author: Peter Aronson. Inventor: João Pedro Neto.
- Lilliputian Monochromatic Alice Chess . All pieces are colorbound, and switch boards rather than switching color. By Peter Aronson.
- Lion Chinese Chess . Chinese Variant from Taiwan. By Yu Ren Dong.
- Lions and Dragons Chess . Hexagonal variant. Dragons carry a ball to the goal while Wizards avoid capture. By Tony Quintanilla.
- LiQi . Very Strong Chss. By Larry L. Smith.
- Little Cheops. Missing description By (zzo38) A. Black.
- Little Dragon Chess . Modern small variant of Xiangqi on board of 41 squares. By Peter Aronson.
- Locusts . Simple chess variant with only two set of pieces on each army. By Yu Ren Dong.
- The Lonely Wolf . Missing description By Namik Zade.
- Los Alamos Chess . Chess on a 6x6 board. Author: David Howe.
- Los Alamos Extinction Chess with Bunkers . On 6 by 6 board with two additional bunkers, and extension chess rules. By Doug Chatham.
- Ludus Equitum. Game in style of Society of Creative Anachronism. By (zzo38) A. Black.
- Ludus Magus . Missing description By Larry L. Smith.
- Lumberjack . Pieces move depending on the column they are on. Author: Robert Price. Inventor: Bruce Zimov.
- Luotuoqi (Camel Chess) . Chess variant designed by committee. Author: Larry L. Smith. Inventor: Various.
- M-Chess . Pieces change movement capabilities depending on the column they occupy. Author: Robert Price. Inventor: Stan Druben.
- Mad Chess . Chess variant with unequal armies on 10 by 10 board. By Jason D. Wittman.
- Mad Elephant Chess . Pawns can be turned into Elephants; Elephants can promote to Mad Elephants, and Mad Elephants can trample lines of pieces. By Peter Aronson.
- Mad King Chess . Missing description By Larry L. Smith.
- Mad Queen Shogi. Missing description By Larry L. Smith.
- Maelstrom . All 64 squares of 8 by 8 board are initially filled with pieces. Author: David Howe. Inventor: Michael Asher.
- Mage. Rooks cannot be captured or capture, and the Queen is replaced by a Mage. Author: Peter Aronson. Inventor: Oliver Xymoron.
- Magi . Variant on 10 by 10 board with new pieces. By Neal Meyer.
- Magician Chess . Variant on 7 by 7 board with nine holes and magician able to move holes. Author: Jens Markmann. Inventor: Jonathon Whittle.
- Magician Chess . Version using Alfaerie graphics. Author: David Howe. Inventor: Jonathon Whittle.
- Magna Carta Chess. lack has the FIDE array, White has a Marshal and an Archbishop instead of a Queen and King. Author: Peter Aronson. Inventor: Charles Gilman.
- Magnetic Chess . Pieces that moved attract and repel pieces like magnets. Author: João Pedro Neto and Fergus Duniho. Inventor: João Pedro Neto and Claude Chaunier.
- Maharadscha . Lone king, moving as queen+knight, versus an army. Author: Uwe Wiedemann.
- Makarenko's Chess . Pieces can split and combine in many ways. Four variants included. Author: Marek14 .
- Make own Army and Handicap Azsymchess . Missing description By Namik Zade.
- Makruk and Sittyuin. Zillions file to play Thai Chess and Burmese Chess. Author: Malcolm Maynard.
- Mamra Chess . Adds the Mamra, a piece that only Pawns may capture. By George Tsavdaris.
- Mapped Chess . Missing description By Stephane Burkhart.
- Marseillais Chess . Move twice per turn. Author: Young-Hyun Joo.
- Matrix Chess . Chess played on a board of tessellating pentagons and diamonds. By David Cannon.
- Maxima . Maxima is an interesting and exiting variant of Ultima, with new elements that make Maxima more clear and dynamic. By Roberto Lavieri.
- Maxima . This ZRF enforces the checkmate condition in Maxima. Author: Roberto Lavieri and Joost aan de Brugh. Inventor: Roberto Lavieri.
- McCooey's Hexagonal Chess . Chess on a board, made out of hexes. Author: Jens Markmann. Inventor: Dave McCooey.
- Mecklenbeck . Pawns can promote on the sixth row. Author: Marek14 . Inventor: Bernd Eickenscheidt.
- Med Chess . Diagonal board game with a mix of traditional, modern and Shogi pieces. Author: Uri Bruck. Inventor: Erez Schatz.
- Medusa Shogi. Missing description Author: Larry L. Smith. Inventor: Gary K. Gifford.
- Mercurial Chess . A variant on 42 squares with a satallite board and the rescure of captured pieces. Author: Peter Aronson. Inventor: Mark Hedden.
- Mesmer Chess . ach player has a Mesmerist piece that can move opposing pieces it attacks. By Dan Troyka.
- Metamachy . Zillions of Games file for Metamachy. (12x12, Cells: 144) By Jean-Louis Cazaux.
- Metamorph Chess . Variant in which pieces transform by fixed rules into other pieces. By Fergus Duniho.
- Metamorphin Assimilation Chess . A hybrid of Metamorph Chess and Assimilation Chess. By Fergus Duniho.
- Metamorphin Fusion Chess . A hybrid of Metamorph Chess and Fusion Chess. By Fergus Duniho.
- Michael's Chess. An elaboration of Lord Dunsany's Chess with varying Pawn sides. By Roger Cooper.
- Microshogi . Small shogi variant on a 4 by 5 board. Inventor: Oyama Yasuharu.
- Mideast Chess . Variant on 10 by 10 board, inspired by ancient Tamerlane chess. Author: Marek14 . Inventor: John Mantle Green.
- Mike's Camel Chess . Lùotuoqí (Camel Chess) variant with more balanced pieces. By Michael Nelson.
- Millennium Chu Shogi . http://pika.cs.nctu.edu.tw/lit/MillenniumShogi.zip. By Yu Ren Dong.
- Mime Attack Chess . Pieces capture like the pieces they're capturing usually capture. By Adrian Alvarez de la Campa.
- Mimic Chess . Chess on a larger board with 3 new pieces with constantly changing movement capabilities. By Nick Wolff.
- Mini Burmese Chess . Small variant of Burmese Chess. By A.J. Winkelspecht.
- Mini Citadel Chess . Mate the king or occupy a citadel of your opponent. By A.J. Winkelspecht.
- Mini Slanted Escalator Chess . Chess on smaller asymmetric board. Author: Peter Aronson. Inventor: David Short.
- Mini Thunder Chess . A small-scale hybrid of Metamorph Chess, Fusion Chess, and Assimilation Chess. By Fergus Duniho.
- MiniXiang. Missing description Author: Larry L. Smith. Inventor: Charles Gilman.
- Missile Chess. Missing description Author: Douglas Silfen. Inventor: R. Wayne Schmittberger.
- Mobile Pawn Chess. Pawns have increased movement. By Tony Quintanilla.
- Modern Chess . A variant on a 9 by 9 board. Author: Marek14 . Inventor: Gabriel Vicente Maura.
- Modern Kamil . A set of variants adding Camels or Camel-like pieces to the Orthochess array. Author: Peter Aronson. Inventor: Nuno Cruz.
- Modern Shatranj. A bridge between modern chess and the historic game of Shatranj. Author: Christine Bagley-Jones and David Howe. Inventor: Joe Joyce.
- Monadchess . Missing description By Namik Zade.
- Monaddropchess . Missing description By Namik Zade.
- MonadDropII (Mats Winther Method) . Missing description By Namik Zade.
- MonadrandomChess . Missing description By Namik Zade.
- Mono-dimensional Chess . Small, one dimensional variant with unorthodox pieces. Author: Glenn Overby II. Inventor: Luiz Carlos Campos.
- Monster Chess . One player has only a king and four pawns, but makes double moves. Author: Uwe Wiedemann.
- Moon Chess . Played with a Xiangqi set, but with different rules. Author: Peter Aronson.
- MoQi. MoQi, or Demon Game, is played upon a 10x10 field. By Larry L. Smith.
- More10 . Chessvariant on a board with 10 squares. By Roberto Lavieri.
- Morley's Chess . Boards with enlarged sides. Author: Andrew Juell.
- Mortal Chessgi . A Chessgi game in which captures reduce material. By Fergus Duniho.
- Mulligan Stew Chess . 42-Square Swapping-Mage Teleporting-Assassin Dual-Color-Bound-King Limited-Double-Move Leaping-Pawn Chess. By Peter Aronson.
- Must Capture Chess. Capturing is mandatory. Author: Roger Cooper.
- Mustang . Missing description By Namik Zade.
- N-Relay Chess. Uncapturable Knights give other pieces the ability to move as Knights. Author: Pierre Tourigny. Inventor: Mannis Charosh.
- Nahbi Chess . Variant on 10 by 10 board with equator, Nahbi's and Archers. Author: David Howe and Uri Bruck. Inventor: Uri Bruck.
- Narnia Chess . Chess, played on both the outside and inside of a social ball, with the Pentagons as "gateways" between the two. By David Cannon.
- Narrow Chess . Variant on 2 by 20 board. Author: Marek14 . Inventor: Peter Aronson.
- Nearly Colorboundmost Chess . Game where all pieces except the Pawns are entirely colorbound, and interactions between colors are weak. Author: Peter Aronson. Inventor: Ralph Betza.
- Neighbors . Try to capture the most pieces on a 42-square board completely filled with neutral pieces. Author: Peter Aronson. Inventor: Rob Nierse.
- Net Chess . This game allows pieces to move to the grid intersections and between intersections. By Tony Quintanilla.
- Neutral King Chess . V.R. Parton's game where two armies share a King both must try to mate. Author: Peter Aronson. Inventor: Vernon Rylands Parton.
- Neutron 45 ZRF . Variant of the game Neutron on a 45-squared board. By Joost Aan de Brugh.
- Nine Square Chess . With additional `Joker' piece on nine by nine board. Author: Marek14 . Inventor: John Mantle Green.
- Ninny chess . Produced and sold in the early 70's by Parker Brothers. Arrows on squares determine direction pieces can move. Author: Fergus Duniho.
- No Chess . Forbid one move to your opponent each turn. Author: Robert Price. Inventor: Zoltan Blazsik.
- Not-particularly-new Chess . A fairly restrainted variant on a 9x8 board, with Cardinals, Unicorns and Jesters. By Peter Aronson.
- Nuthouse . Missing description By Yu Ren Dong.
- Oblique . Variant with board with 40 squares turned 45 degrees. By Tony Quintanilla.
- Oblong chess . Variant of Shatranj, played on a four by sixteen sized board. Author: Andrew Juell.
- Oblong Chess 44 . Missing description By Erez Schatz.
- Oblong Shatranj with Die. Missing description Author: M Winther.
- Octa-Ashtapada. 8x8x8 variant with powerful armies and the potential for multiple royal pieces per side. By Larry L. Smith.
- Octopus Chess . Featuring the Octopus, the Sorcerer Snake, the Ferz Knight, the Wazir Knight and the Ninja Pawns. By Charles Daniel.
- Odds Chess . Ways of giving a weaker opponent better odds. Author: Roger Cooper.
- Odin's Rune Chess . Missing description Author: Michael Nelson. Inventor: Gary K. Gifford.
- OK Chess . After the first move, Pawns can advance any distance. Author: Gary Baydo. Inventor: Clifford Merry.
- Omega chess . Commercial chess variant on board with 104 squares. Author: David Howe.
- Omega Chess Extended . Missing description By Mykola Dolgalov.
- Omega Transplant . The Warmachine Alfil , the Camel Ferz, the Ninja Pawns and the usual suspects battle it out on a new chessboard. By Charles Daniel.
- The One Ring . White wants to get the Ring to the far side and destroy it. By Robert Price.
- One Ring Chess . Chess on a one-dimension ring board. By Larry L. Smith.
- One Way Chess . Missing description By Adrian Alvarez de la Campa.
- Open Chess . Large variant with few pawns. Author: Marek14 . Inventor: Moses Snell-Feikema.
- Operational Chess. Wargame inspired variant played on a wide board. By Andy Thomas.
- Operational Chess 2. Large, wargame inspired variant with ranged pieces. By Andy Thomas.
- Opulent Chess . Zillions file for Opulent Chess. By Greg Strong.
- Orwell Chess . Three player variant themed on George Orwell's 1984. By Glenn Overby II.
- Outback Chess . New pieces on plus-shaped board. Author: Peter Aronson. Inventor: Timothy R. Newton.
- Pachessi . Race and chess game on board formed by removing 3 by 3 square from center of 7 by 7 square. By Peter Aronson.
- Pacific Chess . Variant on ten by ten board. Author: Marek14 .
- Palace Ninja Guards . A pair of short-range diagonal leapers and four extra squares are added to the standard chessboard and pieces. By Charles Daniel.
- Panal: a hexagonal chess . A double-royal piece variant on a 61-hex board. By Glenn Overby II.
- Parachess . Chess on a rhombus-tiled board. By Tony Paletta.
- The Pattern Game . Missing description By Larry L. Smith.
- Paul Schoolong's chess . Missing description By Yu Ren Dong.
- Paulowich's Chancellor Chess . A proposal to play chancellor chess with chancellors and queens in the corner on 8 by 8 board. Author: Marek14 . Inventor: David Paulowich.
- Pawn Less Chess . Different pieces, no pawns, and 20 squares removed from the 8 by 8 board. By Uri Bruck.
- Pawn Massacre Chess. Non-pawn pieces swap initial ranks. By Jeff `Cavebear` Stroud.
- Pawn Pusher Chess . Pawns can not move by themselves on a player's side of the board, they must be pushed by other pieces. Author: Marek14 . Inventor: Tony Paletta.
- Pawn-Only Chess . Training chess variant. Only pawns, first promotion wins. Author: Marek14 .
- Pawn-Only Chess . Training chess variant. Only pawns, first promotion wins. Author: Uwe Wiedemann.
- Peanut Chess . Hexagonal chess variant with board in shape of peanut. Author: Marek14 . Inventor: Philip John Brady.
- Pent-Ashtapada. A hybrid of Maack's Raumschach and Kogbetliantz' 8x8x8 game. By Larry L. Smith.
- Penta War . Huge game with five clans. By Joost Aan de Brugh.
- Penturanga . contains rule file and 2 piece sets. By Graeme C Neatham.
- Perfect 12 . 36 pieces per player on 12 by 12 board. By Jean-Louis Cazaux.
- Perfect Chess . On 8 by 8 board with combination pieces. Author: Marek14 . Inventor: Köksal Karakus.
- Perimeter Chess . Pieces other than Pawns and Kings move differently when moving to or from edge squares. Author: Marek14 . Inventor: Tony Paletta.
- Petty Chess . Chess on a 5 by 6 board. Author: Marek14 . Inventor: B. Walker Watson.
- Philosophers Chess . Chess variant on two small boards with usual and `philosophical' piece. Author: Fergus Duniho and Jens Markmann. Inventor: Darren Izzard.
- Pick the Piece Big Chess . Massive collection of games featuring dual path Sorcerer Snake; crooked slider: Octopus and much more. By Charles Daniel.
- Pick-the-Team chess . Make up a list of pieces and choose your pieces from your and your opponents list. Author: David Howe. Inventor: Hans L. Bodlaender.
- Piece Promotion Games. Two decimal variants: 'Shatranj Elephants' and 'Chaturanga'. By Christine Bagley-Jones.
- Piece Promotion Games 2 . Missing description By Christine Bagley-Jones.
- PieceEater Chess . Yet another game with an indestructible randomly-wandering neutral piece. By Peter Aronson.
- Pierre Menard's Chess Variant. As described by Jorge Luis Borges. By Jeff Rients.
- Pillage . Featuring the unique Super Pawn: a powerful short-range piece with promotional capabilities. By Charles Daniel.
- Pillars of Medusa . Download Pillars of Medusa for Zillions of Games! Author: Jason Jakupca. Inventor: Gary K. Gifford.
- The Pit . 10 by 10 board has pit in the middle that can be crossed by Sorcerer piece. By Daniel Roth.
- The Pizza Kings . An experimental army for Chess with Different Armies, with lots of calories. By John Lawson.
- Planar 4x4x4 Chess . 3D variant played with pieces which are restricted to particular planes within the cubic field. By Larry L. Smith.
- Platform Chess . Pieces move normally or ride on 2x2 platforms that move themselves. By Robert Price.
- Ploy . Strategic Game of Maneuver and Capture, 3M Company - 1970. Author: Jean-Louis Cazaux.
- Pocket Mutation Chess . Take one of your pieces off the board, maybe change it, keep it in reserve, and drop it on the board later. By Michael Nelson.
- Pocket Polypiece Chess 43 . Game with off-board pocket where all pieces of a type change when one piece of a type is moved normally. By Antoine Fourrière.
- Pole Chess . F.I.D.E. chess with Pole piece added: from the SF/fantasy novel "Robot Adept". Author: Malcolm Webb. Inventor: Piers Anthony and Malcolm Webb.
- Politically Correct Chess. Missing description By Larry L. Smith.
- Polyhedron Chess . Large 3-D variant inspired by Tetrahedral Chess. By Larry L. Smith.
- Polymorph Chess . Knights and Bishops can morph into each other or into combined pieces. By Greg Strong.
- Pompeii Chess . Variant on board with 25 squares. By Dan Troyka.
- Pool Chess . Queens and Bishops bounce 90 degrees off the board edge. Author: Tony Quintanilla. Inventor: Francisco Quintanilla.
- Potential/Demotion Chess . Pieces may move like lower-ranked piece, but when doing so, become that lower ranked piece. By Peter Aronson.
- Presiding Chess. Decimal variant with added leaping pieces. By Tucker Kao.
- Primitive Chess . Short-range major pieces and no pawns, but a piece like an apprentice for each major piece. Author: Marek14 . Inventor: Köksal Karakus.
- Prince . 3-D Chess variant using an 8x8x8 board and many new pieces. Author: Larry L. Smith. Inventor: Gavin Smith.
- The Princess and The Warrior . Pieces' moves are limited by their current rank except for the two new pieces. By Adrian Alvarez de la Campa.
- Prisoner's Escape . Free your Prisoner by getting it to an unattacked square -- a small board version of Anticheckmate Chess. By Peter Aronson.
- ProCycle Chess. Individual pieces promote one by level after each played move. By Ken Franklin.
- Progressive Chess . A collection of variants with increasing numbers of moves each turn. Author: Young-Hyun Joo.
- PromoChess . Everything but the king can power up. By Glenn Overby II.
- Promotions & Demotions . Every turn, the piece that has moved promotes or demotes to another piece. By João Pedro Neto.
- Push Chess . Pieces don't capture, but instead push each other off of the board. Author: Marek14 . Inventor: Fred Galvin.
- Quad-Square Chess . Chess on a board of 38 squares, of which six have size two by two. Author: Robert Price. Inventor: David Howe.
- Quang Trung Chess, 2nd edition . On 10 by 10 board with seven mostly new pieces. By Vu Q Vo.
- Quantum Chess . Commercial variant with new pieces on 10 by 10 and 12 by 12 boards. Author: Robert Price.
- Queens and Pawns . Try to arrange nine Queens and a Pawn on a standard Chess board so that none of them attack each other. Author: Doug Chatham.
- Queens or Castles. Wizards promote by making an opponent's piece [or pawn] and themself vanish from the board. Author: Larry L. Smith. Inventor: Gary K. Gifford.
- Quintessential Chess . Large chess variant, with some pieces moving with a sequence of Knight moves in a zigzag line. Author: Peter Aronson. Inventor: Jörg Knappen.
- R-Chess . Captured pieces are held in reserve and then dropped. By Marcello Netto.
- Ramayana Chess . Chess variant inspired by the Ramayana epic. Author: Peter Aronson. Inventor: Luiz Carlos Campos.
- Random-Drop Chess . Missing description By Namik Zade.
- Rank behind Rank . 30 pieces on a side with two Kings each on a 6 by 12 board. Author: Peter Aronson. Inventor: Sergey Sirotkin.
- Raptor Chess . Two pairs of complimentary flying/leaping pieces: the Raptors and the Flying Bombers change the nature of the game. By Charles Daniel.
- Raumschach . The classical variant of three-dimensional chess: 5 by 5 by 5. Author: Robert Price. Inventor: Dr. Ferdinand Maack.
- Ravioli Chess . Chess on two boards squeezed together at the edges. By Antoine Fourrière.
- Re. Drop pieces on a 5 by 5 board. By (zzo38) A. Black.
- Ready Chess . Pieces cannot capture right after capturing, they have to be restored first. By Tony Quintanilla.
- Rebel Chess . King's Pawn is replaced by Recruiter piece that moves like an Alfil and can change a piece's side. Author: Peter Aronson.
- Rebel Fury . Missing description By Larry L. Smith.
- Recognized Variants of the Month . Game Pak I. (Recognized!)
- Reduced Endgame Chess . Two kings and six pawns are used for practicing endgames. Author: Uwe Wiedemann.
- Reenterent Chess . There is one additional square where taken pieces can wait to reenter 5 by 8 main area. Author: Peter Aronson. Inventor: Edward Lovett.
- Regenbogen . Unusual spectrum-based game with Wizards, Clerics and Spirits. Author: Joost Aan de Brugh. Inventor: Jared B. McComb.
- Regulator Chess . Game on a 35 square board with a 7 square track on which a piece moves that determines how Knights and Bishops can move. Author: Peter Aronson. Inventor: Samuel H. Bell.
- Relativistic Chess. Squares attacked by the opponent are considered not to exist. Author: Robert Price. Inventor: Kevin Whyte.
- Renezan's Chess . Proprietary game, Bi Triad, 1993. Inspired by Wildebeest Chess. Author: Yu Ren Dong. Inventor: BiTriad.
- Renniassance Chess . Game played on several sizes of large board with 68 pieces per side. Author: Edward Holzman. Inventor: Eric V. Greenwood.
- Rhino Chess . Collection of variants designed to demonstrate the Rhino family of pieces. By Peter Aronson.
- Rifle Chess . Pieces are taken by shooting: capturing without moving. Author: Robert Price. Inventor: W. B. Seabrook.
- Right or Left Chess . Pieces are either right-moving or left-moving and may flip from one to the other. By Adrian Alvarez de la Campa.
- River Chess . Get one of your pieces to the other side of the board. By Karl Scherer.
- Robber Chess . Sliding pieces can make multiple captures, and the goal is to capture all opposing pieces. Author: Uwe Wiedemann.
- Robber-Baron . Which of the seven robbers is the robber-baron? Author: David Howe. Inventor: Seth McGinnis.
- Rococo . A clear, aggressive Ultima variant on a 10x10 ring board. Author: Peter Aronson. Inventor: Peter Aronson and David Howe.
- Rogue Pawn Chess . Pawns may double-move on any rank except for their starting rank. Author: Marek14 . Inventor: Tony Paletta.
- Rollerball . Chess race fight on board formed by removing 3 by 3 square from center of 7 by 7 square. By Jean-Louis Cazaux.
- Rolling Kings . Kings must move along a predetermined path. By Peter Aronson.
- Roman Chess . Commercial chess variant on 10x10 board with two non-royal kings added. Author: Fergus Duniho. Inventor: Mark Woodall.
- Romanchenko's chess . Game on a Z-shaped board to inspire new thinking. Author: Andrew Juell. Inventor: V. Romanchenko.
- Rooksquare Chess . Win by moving piece to corner at opponent's side. Author: Uwe Wiedemann. Inventor: Jens Baek Nielsen.
- Rotor-blades Chess . Played on a circular tessellation of 150 triangular cells. By David Cannon.
- Rotorblades Fusion Chess . A cross between my own Rotorblades Chess and Fergus Duniho's Assimilation Fusion Chess, with a few extra features. By David Cannon.
- Round Honeycomb Chess . Round Honeycomb Chess is a cross between Circular/Cylindrical Chess and Hexagonal Chess. By David Cannon.
- Round Table Chess 84 . Chess on a special round board with 84 squares. By Richard G. VanDeventer.
- Royal Amazon Chess . Queens are replaced by Royal Amazons. By Peter Aronson.
- Royal Fury. A Futuristic Chessery Game - relaxed win rules. Author: Larry L. Smith. Inventor: Vernon Rylands Parton.
- Royal Guard Chess . Royal Guards help defend King and all pieces can promote. By Adrian Alvarez de la Campa.
- Royal Queens Chess . Game with full board and all pieces are sliders or immobile and victory is by capture of all 8 opposing Queens. Inventor: Derek Nalls.
- Rubble Chess . Pieces must clear out unoccupied squares before they can move through them. Author: Peter Aronson. Inventor: Adam Norberg.
- Ruddigore Chess . Chessgi variant where you can capture your own pieces, and every other turn you must capture or sacrifice a piece. By Peter Aronson.
- Russian Symmetrical Chess. Rusian 9x9 variant with symmetrical setup and Pawns that get more powerful halfway across the board. Author: Larry L. Smith. Inventor: E. F. Burtzev.
- Rutherford's 1-dimensional Shogi. Modern one-dimensional chess variant, based upon Shogi. Author: Larry L. Smith. Inventor: Jonathan H Rutherford.
- Ryu Shogi . Large modern shogi variant. Author: Peter Aronson. Inventor: Jared B. McComb.
- Sacred King Chess . It is not legal to check your opponent's King, so victory is by stalemate or bare King. By Peter Aronson.
- Samarcanda . Variant of Mideast Chess with Crooked Bishops. By Nuno Cruz.
- Sanctuary . 46-cell game with elements from Xiang Qi. By Jeremy Pflasterer.
- Sankaku Shogi . Small Shogi variant played on a board of 44 triangles with no drops and a teleporting Emperor. By Larry L. Smith.
- Save the Standard . Zip file containing zrf and graphics for 7x7 and 13x13 home fields. By Graeme C Neatham.
- Schachdame . Variant between Checkers and Chess. Author: Uwe Wiedemann. Inventor: Heinrich Richter.
- Schachmühle . Morris game played on a Chessboard with Chess pieces. Author: Uwe Wiedemann.
- Schizophrenic Chess . Game on 12x7 board with Left and Right Schizzys, Bobbers, Teleporters and other exotic pieces. Author: Peter Aronson. Inventor: David Short.
- Schoolbook . Zillions file for Schoolbook. By Sam Trenholme.
- Schoolbook (updated) . Missing description By Sam Trenholme.
- Scion . Missing description By Larry L. Smith.
- Scirocco (original) . On ten by ten board with over thirty different pieces. By Adrian King.
- Scirocco (revised) . On ten by ten board with over thirty different pieces. By Adrian King.
- Seenschach . Variant on 10 by 10 board with lake in the middle and new pieces. Author: Peter Aronson. Inventor: Jörg Knappen.
- The Seeping Switchers . An army for Chess with Different Armies based on pieces that change color when they move. Author: Peter Aronson. Inventor: Jörg Knappen.
- Separate . Queens start trapped behind enemy lines. Author: Uwe Wiedemann. Inventor: Brian Wong.
- Separate Realms Chess . Pieces capture like normal FIDE pieces, but have limited moves that only take them to part of the board when not capturing. Author: Peter Aronson. Inventor: Michael Nelson and Peter Aronson.
- Shako . Cannons and elephants are added in variant on 10 by 10 board. (10x10, Cells: 100) By Jean-Louis Cazaux.
- Shamanic Chess . Pieces may be transformed into 'Shamans'. By M Winther.
- Shanghai Palace Chess . Download these files to play this blend of Chinese, Japanese and Western Chess with Zillions of Games. Author: Larry L. Smith. Inventor: Gary K. Gifford.
- Shatra . Old game from the Altai from Russia, on special shaped board with draughts-like capture. Author: Francis Monkman.
- Shatranj . Version with fancy graphics. Author: David Howe.
- Shatranj . The widely played historic Persian game, predecessor of modern chess. Author: Tony Quintanilla.
- Shatranj Elephants. Two decimal variants: 'Shatranj Elephants' and 'Chaturanga'. By Christine Bagley-Jones.
- Shatranj Elephants. Shatranj-like game, but with all short-range, limited-capturing pieces. By Christine Bagley-Jones.
- Shatranj for Four. 4-handed Shatranj. Author: M Winther.
- Shatranj of Troy. A Shatranj variant with Shogi-like drops, a Trojan Horse (with 6 pieces inside). Author: Larry L. Smith. Inventor: Gary K. Gifford.
- Shatranj Plus . Play four large historical variations of Shatranj including Tamerlane Chess! Author: Malcolm Maynard.
- Shifting Sands Chess . Special squares -- which can be dropped and moved -- change the types of pieces that land on them. By Tony Quintanilla.
- Shock Troops . Make a regular move or drop one of two pieces into a vacant space in the back rank. By Charles Daniel.
- Shogi . Westernized version using Alfaerie graphics. Author: David Howe and Fergus Duniho.
- Shogi 3D. Three dimensional version of Japanese Chess. By Larry L. Smith.
- Shogi, Mortal Shogi, and Kamikaze Mortal Shogi . Play Shogi and a couple variants with diminishing pieces. Author: Fergus Duniho. Inventor: Fergus Duniho and Roberto Lavieri.
- Shogi, Mortal Shogi, and Kamikaze Mortal Shogi . Optimized ZRFs for Japanese Chess and some recent variants. Author: Fergus Duniho.
- The ShortRange Project . Missing description By Christine Bagley-Jones and Joe Joyce.
- Shuffle Version Azchess . Missing description By Namik Zade.
- Simple Marseillais Chess . Simplified version of Marseillais Chess. By Fergus Duniho.
- A Simple Proposal. Variant where promotion may occur on the 7th or 8th rank, and may be delayed, but only to captured pieces. Author: Peter Aronson. Inventor: Ted Clancy.
- Sino-European Chess . Missing description By Andy Thomas.
- Sissa . Variant on 9 by 9 board with Sissa's, which move like a Bishop than a Rook, or like a Rook, then a Bishop. Author: Uwe Wiedemann. Inventor: Carlos Cetina.
- Sittyuin and Makruk. Zillions file to play Burmese Chess and Thai Chess. Author: Malcolm Maynard.
- Skandaran Chess. Download Skandaran Chess at Zillions Website. By Francisco Marzoa.
- Skirmish Chess . Pawns start on the 3rd and 6th ranks with no double-move, pieces on the 2nd and 7th ranks. Author: Marek14 . Inventor: Tony Paletta.
- Sky . Missing description By Christine Bagley-Jones.
- Slanted Escalator Chess . Chess on an asymmetric board with interesting connectivity. Author: Peter Aronson. Inventor: David Short.
- Slide Chess . Variant on 44 squares with moving cages. Author: Antoine Fourrière. Inventor: João Pedro Neto.
- Smegi . Arrows on squares show where pieces can go - crossover between Smess and Shogi. By Fergus Duniho.
- Smess . Produced and sold in the early 70's by Parker Brothers. Arrows on squares determine direction pieces can move. Author: Fergus Duniho.
- Snake Chess . A variant played on a 2 by 12 cyclindrical board. Author: Peter Aronson. Inventor: Sergey Sirotkin.
- Snark Hunt . Variant with unequal armies on board with 41 squares, inspired by a poem of Lewis Carroll's. By Peter Aronson.
- Solitaire chess puzzles . Several chess puzzles to try with Zillions of Games. Author: Uwe Wiedemann.
- Spacious Cannoneers . Experimental Army for Chess with Different Armies vs the traditional CDA Armies. Author: Peter Aronson. Inventor: Ralph Betza.
- Spacious Torus Chess . Chess on a toroidal board, using Ralph Betza's spacious pieces. By Jianying Ji.
- Spartan Chess 28 for Zillions . Zip file with Zillions rules file and graphics. By Graeme C Neatham.
- Spherical Guard Chess . Play with either the single-board or dual-board sphere projection . By Graeme C Neatham.
- Spinal Tap Chess . Variant on an 11x11 board with a once-a-game mass 'Battle Move' of Pawns and Crabs. Author: Peter Aronson. Inventor: David Short.
- Spinal Tap vs Terror Chess . The Spinal Tap Chess army vs the Terror Chess army in the battle of the 11x11 variants. Author: Peter Aronson. Inventor: David Short.
- Springermühle . Chessboard Morris game played with Knights. Author: Uwe Wiedemann.
- Squadron Chess. Uses only one type of piece besides the King. By Ken Franklin.
- Squarcle Chess . Orthogonal pieces travel in square loops, diagonal pieces reflect. Author: Fergus Duniho. Inventor: Christan Hupp.
- SSShess . Missing description By Namik Zade.
- Stability Chess. Designed to minimize the first-move advantage by white, maximize fairness, and simplify the rules of chess. Author: Larry L. Smith. Inventor: Various.
- Star Pool Chess . Large variant of Makruk, with a center non-square that acts as a bridge. Author: Peter Aronson. Inventor: Peter Aronson and Tony Quintanilla.
- Stationary King Chess . Kings can't move. Author: Uwe Wiedemann.
- Stations . Missing description By Larry L. Smith.
- Stealth Ninja Chess . Dynamic but balanced game with short-range leapers, and unusual sliding pieces: the Stealth Gryphon and Anti-Gryphon. By Charles Daniel.
- Step and Circle TrigChess . contains rules file with 2 boards and 2 piece sets. By Graeme C Neatham.
- Step by Step Handicap Chess . Missing description By Namik Zade.
- Sting . A game where Kings can move like Grasshoppers in addition to their normal move. Author: Uwe Wiedemann.
- Storm the Ivory Tower . Play this Smess adaptation of Chinese Chess with Zillions of Games. By Fergus Duniho.
- Straights . Chess-like Naval Battle game from the end of the 19th Century. Author: Young-Hyun Joo. Inventor: Anne Marriot Watson.
- String Chess. A one-dimensional variant with a fairy theme. Author: Mathew M. Burke. Inventor: Aaron Hall.
- Subway Chess . In a turn, player moves first middle subway part of board and then a piece. Author: Peter Aronson. Inventor: Francois Tremblay.
- Sudden Death Chess . A piece must be sacrificed after each non-capturing move. By Doug Chatham.
- Sudoku Chess . Missing description By Doug Chatham.
- Sudoku War . A fight that takes place in a Sudoku. By Joost Aan de Brugh.
- Sunflower HexChess Zillions zip . Sunflower HexChess Zillions rule file. By Graeme C Neatham.
- Super Chess III . Big proprietary game with archers and cyclopses. Author: Larry L. Smith. Inventor: Ed Ginsberg.
- Super Knights Grand Chess . The original Super Knights with the Archbishop, Amazon, and Chancellor, as well as two more exciting and innovative games. By Charles Daniel.
- Super Maharadscha . Missing description By Namik Zade.
- Swap Chess. A move can consist of a series of pieces swapping places. By João Pedro Neto.
- Swapmate Chess . Missing description By Adrian Alvarez de la Campa.
- Switching Chess. In addition to normal moves, switch with an adjacent friendly piece. By Tony Quintanilla.
- Switching Realms Chess . All noncapturing moves must change the board subset a piece occupies. Author: Peter Aronson. Inventor: Jörg Knappen.
- Symmetric Sissa . Variant on 9 by 9 board with symmetric setup and two Sissa's (generalized Knight-like sliders). Author: Uwe Wiedemann. Inventor: Carlos Cetina.
- Symmetrical Chess Collection. Collection of several large symmetric chess variants with only line pieces. Author: Derek Nalls and Larry L. Smith. Inventor: Derek Nalls.
- Symmetron! 112 . Large version of Symmetron!, with a third modifier. By Antoine Fourrière and Roberto Lavieri.
- Symmetron! 44 . Most pieces move orthogonally or diagonally according to situation. By Antoine Fourrière and Roberto Lavieri.
- Take Over Chess . Jump across pieces to take them over from your opponent. By Tony Quintanilla.
- Tamerlan Chess . Westernized version using Alfaerie graphics. Author: David Howe.
- Tamerlane Chess . A well-known historic large variant of Shatranj. Author: David Howe.
- Tamerlane II . Modern variant based upon ancient large chess variant. By Jean-Louis Cazaux.
- TamerSpiel . Modern large chess variant with elements of historic chess variants. Author: Glenn Overby II. Inventor: Eric V. Greenwood.
- Tandem-84 . Variant on two boards of 7 by 6 rows with pieces moving between boards. Author: Peter Aronson. Inventor: Jim Aikin.
- Tank Chess . With exploding bombs and pushing tanks. Author: Robert Price.
- Tape Chess . Tape Chess and other almost one-dimensional chess variants. Author: Marek14 . Inventor: Sergey Sirotkin.
- Tapestry . Chess on a four-color 6x6 board, with a 5 square control board. Author: Peter Aronson. Inventor: David Howe.
- Taratibu - a small progressive chess variant . 10 pieces per side on a 7-by-7 board. By Glenn Overby II.
- Tauschach . Each player has one piece off the board, that can be switched every turn with one of his pieces but not the king. Author: Uwe Wiedemann.
- Taxi Chess . Pay for moves: long moves are expensive. Author: Robert Price. Inventor: Ralph Betza.
- Teamster Chess . Pawns pull the friendly piece behind them. Author: Marek14 . Inventor: Tony Paletta.
- Templar Chess . Features the unorthodox Templar on a board with eight extra squares. By Adrian Alvarez de la Campa.
- TenCubed Chess. Variant on 10 by 10 board with combination pieces (Zillions file). (10x10, Cells: 100) By David Paulowich.
- Tepuy . A territorial game, with unique setup, movement and capturing. By Roberto Lavieri.
- Terran Chess (Galactic Federation) . Chess from the 24th century? By Graeme C Neatham.
- Terror Chess . Variant on 11 by 11 board with combination pieces. By Brian Wong.
- Tetrahedral Chess . 3d chess variant with board in form of tetrahedron. By Mark Thompson.
- The Black Ghost . Black gets a teleporting Ghost piece that can not capture to balance White's first move advantage. Author: Antoine Fourrière. Inventor: Ralph Betza.
- The Travelers . Missing description Author: Roberto Lavieri and Larry L. Smith. Inventor: Roberto Lavieri.
- Thinktank Chess . Frank Maus' game where most pieces move differently when capturing from how they move without capturing. Author: Peter Aronson. Inventor: Frank Maus.
- This Game is for the Birds . Game where pieces fly past obstacles and some pieces capture by pecking. Author: Peter Aronson. Inventor: Ralph Betza and Peter Aronson.
- Three Check Chess . If you deliver check for the third time, you win. Author: Andreas Kaufmann.
- Three Fat Brothers Chess . On a 9x9 board with 3 royal pieces. Author: Marek14 . Inventor: Sergey Sirotkin.
- Three Player Hex Shogi 91 . A hexagonal Shogi Variant for three players. By Fergus Duniho.
- Thronschach . A game on 42-squares with throne squares, and an interesting mix of pieces. Author: Peter Aronson. Inventor: Glenn Overby II.
- Thunder Chess . A hybrid of Metamorph Chess, Fusion Chess, and Assimilation Chess. By Fergus Duniho.
- TigerChess. Missing description By Glenn Nicholls.
- Tiled Squares Chess . Drop tiles to create the board as you play. By Tony Quintanilla.
- Tim's 3d Chess . On a 5x5x5 board with two kings per playe. By Tim O'Lena.
- Tim's 4x8x4 3D Chess . A practical and playable 3D chess game. By Tim O'Lena.
- Tim's 6x6x6 3d chess . 3d chess variant on 6 by 6 by 6 board. By Tim O'Lena.
- Timeline. Pieces travel through time on four 4 x 4 x 4 boards. By George Marino.
- Toccata . A hexagonal variant inspired of Maxima. By Roberto Lavieri.
- Toe to Toe Chess . A variant of Sittuyin (Burmese Chess) with alternating setup, and powerful, short-range pieces. By Peter Aronson.
- Too Many Elephants. All pieces can move leap two squares on the diagonals like Elephants/Alfils in addition to their normal move. By Peter Aronson.
- Topologies Chess . Chess on a Cylindrical board, on a Toroidal Board, on a Mobius Strip and on a Klein Bottle. Author: Andrew Juell. Inventor: Alberto Monteiro.
- Tori Shogi. Bird Shogi. Author: Eduard Werner. Inventor: Ohashi Soei.
- Torus Chess . Large chess variant on torus shaped board. By Köksal Karakus.
- Total Chess . Missing description Author: Stephane Burkhart. Inventor: Charles Beaty.
- Toto40 . Staircase board with fighting line in the middle, inspired by Totolospi game of Hopi Indians. Author: Jens Markmann. Inventor: Peter Aronson.
- Touranian International . 10x10 Chess variant. Author: Fergus Duniho. Inventor: Lee Tomkow.
- Tournament Chess with Different Armies . Chess with Different Armies ZRF for the Chess with Different Armies e-mail tournament. Author: Peter Aronson. Inventor: Ralph Betza.
- Tournoy . Pieces have orientation that can be rotated. By Jean-Louis Cazaux.
- Toystore Chess. A problem-like Chess variant on a 5x5 board with free placement. Author: Peter Aronson. Inventor: Richard Stack.
- Traded Places Chess. An enemy piece is moved to your attacking piece's beginning position during its capturing move. By Ken Franklin.
- Train Wreck Chess . Move your piece, then one of your opponent's, but only forward. By Peter Aronson.
- Trampoline Chess . Each player has a Trampoline that allows friendly pieces to make a second move. By Mark Thompson.
- Trans-Dimensional Chess . Large 3-D game with a field of twenty 3x3x3 cubes arranged in three levels. By Larry L. Smith.
- Transporter Chess . Large variant with transporters and several new pieces. Author: Dan Troyka. Inventor: Andrew P. Newton.
- Transporter Pad. Variant of Star Trek 3D Chess. By Larry L. Smith.
- Transpose Chess . Sideways board, promote your pawns quickly. By Köksal Karakus.
- Tree garden chess . Large chess variant on 10 by 10 board with 4 by 4 area missing from the middle. Author: Mark Thompson. Inventor: William Overington.
- Treeleaders Chess . Download these files to play this large variant with non-similar armies with Zillions of Games! Author: Uri Bruck. Inventor: Erez Schatz.
- Trek71 Chess . All pieces on the lefthand-side are shown as black, but do not change owners, and vise-versa. By Ken Franklin.
- Trihex . Three-player hexagonal variant with extra pieces. By Marek14 .
- TriMac HexChess . Zillions Rule File and Graphics. By Graeme C Neatham.
- Triplets. Move in one turn a pawn, the king, and another piece. Author: Doug Chatham. Inventor: Adam Sobey.
- Tripunch Chess. Knights become Nightriders, Rooks add Gryphon moves, Bishops add Aanca moves, and Queens become unbelievable. Author: Peter Aronson. Inventor: Ralph Betza.
- Triumvirate Chess . Uses three Knights. The last remaining opposing Knight must be checkmated as the King. Author: Peter Aronson.
- Trophy Hunt Chess. Capture at least one of each trophy animal to win. Author: Douglas Silfen and Karl Scherer.
- Trubix . Chess variant on board with 41 squares. Author: Peter Aronson. Inventor: David Short.
- Trubix-43 . Unique piece and lines of movement on an hourglass board. Author: Peter Aronson. Inventor: David Short.
- Turkish Chess . 8x10 board with different combination pieces, Vao and Pao. Author: Marek14 . Inventor: Köksal Karakus.
- Turmmühle . Chessboard Morris game played with Rooks. By Uwe Wiedemann.
- Tutti Frutti Chess . With bishop-knight, knight-rook, queen-knight and the usual pieces on an 8 by 8 board. Author: Uwe Wiedemann. Inventor: Ralph Betza.
- Twenty-first Century chess . A Zillions file to play an updating of Chess for the video game generation, on a 10x8 board with Barons and Jesters. Author: Peter Aronson.
- Twiknight . Knights can make one double move a game, and always check with a double move. Author: Peter Aronson. Inventor: Jens Baek Nielsen.
- Two Kingdoms . A decimal variant with a more powerful knight, and an added Archer piece. Author: Peter Aronson. Inventor: Nuno Cruz.
- Two Pipe Chess . Setup on 41-squares board looks like two tobacco pipes. By Doug Chatham.
- Typhoon . Variant on 12 by 12 board with many different pieces. By Adrian King.
- Typhoon (Revised) . Missing description By Adrian King.
- Ultima . Version using Alfaerie graphics. Author: David Howe. Inventor: Robert Abbott.
- Ultima with Alternate Graphics . Game where each type of piece has a different capturing ability. Author: David Howe. Inventor: Robert Abbott.
- Ultimate Battle Chess . Pawns, kings, queens, and knights move differently. By Vu Q Vo.
- Ultimatum . Variant of Ultima that adds a FIDE-Queen and an Advancer in place of one Long-Leaper and one Chameleon. By Roberto Lavieri.
- 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.
- Undecided Chess . Pieces begin in an undecided state until they move. By Adrian Alvarez de la Campa.
- Unicorn Chess . 10x10 variant with a new piece that moves as a Bishop or a Nightrider. Author: Fergus Duniho. Inventor: David Paulowich.
- Unirexal Chess . Only white has a king. Author: Uwe Wiedemann. Inventor: Vernon Rylands Parton.
- Universal Handicap Chess . Missing description By Namik Zade.
- Unreal Tournament Chess . Chess variants with a different objective, inspired by the multiplayer computer game Unreal Tournament. Author: Robert Price. Inventor: João Pedro Neto.
- Upside-Down Chess . White starts at the upper two rows, black at the bottom. Author: Marek14 .
- Venomous . The Sissa and Sorcerer Snake on a large board chess system with Ninja Pawn drops. By Charles Daniel.
- veSQuj - Chess with 21st century armies . A highly tactical variant with a 21st-century-war theme. By Glenn Overby II.
- Vietnamese Chess . Each player has a King, which captures cannon-style, and 11 non-capturing Pawns on a 25-intersection Alquerque-style board. Author: Marek14 .
- Viking Chess . Armies start side-by-side on a 12 x 7 board. By Tomas Forsman.
- Voidrider Chess . A 43 square variant with movable spaces. By Fergus Duniho.
- Vyremorn Chess . Large variant on two overlapping square boards. Author: Jens Markmann. Inventor: Nathan McDonald.
- Wa Shogi. Large Shogi variant from the 17th century or earlier. Author: Douglas Silfen.
- The War of the Stars . Missing description By Namik Zade.
- War of the Worlds . Chess army from planet Earth against the Martian forces of Jetan. By Jean-Louis Cazaux.
- Warp Factor. Variant of Star Trek 3D Chess. By Larry L. Smith.
- Warp Point Chess. Knights are replaced by Warp Points that other pieces can move between. Author: Peter Aronson. Inventor: Jason Shields.
- The Weak Square of the Jumping King . Kings start jumping around, dropping the other pieces on a board with 38 squares. By João Pedro Neto.
- Weak! . Black has 7 knights, and 16 pawns, White the usual array. Author: Uwe Wiedemann.
- Weakest Chess . Pieces are as weak as possible while still retaining chess-like qualities. Author: David Howe. Inventor: Ralph Betza.
- Weave and Dungeon . Abstract game played on a board divided into Weave and Dungeon, with movement following different rules on each part. By Dan Troyka.
- Whale Shogi. Small Shogi variant. Author: Douglas Silfen and Karl Scherer. Inventor: R. Wayne Schmittberger.
- Where Eagles Fly . Missing description By Michael Nelson.
- White Elephant Chess . Four variants pitting the white Elephant army against black with the normal FIDE array. By Peter Aronson.
- Wild Jokers . 7 by 7 board with 8 pits and various pieces, including jokers that can make successive jumps across pit. Author: Peter Aronson. Inventor: Jeff `Cavebear` Stroud.
- Wildebeest Chess . Variant on an 10 by 11 board with extra jumping pieces. Author: Jean-Louis Cazaux. Inventor: R. Wayne Schmittberger.
- Windows Chess . Windows Chess is played on a board inspired by an arch window in my neighbourhood. By David Cannon.
- Wizard Chess . Variant on 12 by 7 board with fantasy pieces (includes Advanced Wizard Chess). Author: Jens Markmann. Inventor: Paul E. Newton and Andrew P. Newton.
- Wizard's War . Game with piece-creating Wizards and a board divided into arena and enchanted sections. By Michael Nelson.
- Wolf Chess. Half-century old variant on 8 x 10 board with many unusual pieces. Author: Ivan Derzhanski. Inventor: Dr. Arno von Wilpert.
- Wormhole Chess . When a piece leaves a square, it `folds' together. By Fergus Duniho.
- Wreckage! . Features 3 new pieces: the Detonator, Dragon and the Flying Guillotine plus 5 Ninja Pawns. By Charles Daniel.
- Wuji Chinese Chess. Invented by Zheng Lei(鄭磊,河南光山縣人) in 1993. Author: Yu Ren Dong. Inventor: Zheng Lei.
- Xhatranj . An exotic variant of Shatranj with more powerful pieces. By Christine Bagley-Jones and David Howe.
- Xhess . Decimal variant with Nightriders and Cannons. By David Howe.
- Xhess . Version using Alfaerie graphics. By David Howe.
- Xiang Hex . Missing description By Larry L. Smith.
- Xiangqi . Western Style. Version using Alfaerie graphics. Author: David Howe.
- Xiangqi 3D. Three dimensional version of Chinese Chess. By Larry L. Smith.
- Xiangqi 42 . A minature version of Xiangqi (Chinese Chess) on 42 square. By Robert Price.
- ximeracak. . A fantasy variant designed for play with a standard set. (8x8, Cells: 64) By Glenn Overby II.
- Yang Qi . Yankee ingenuity adds new power to Chinese Chess. By Fergus Duniho.
- Yáng Qí - Oriental Graphics . Yankee ingenuity adds new power to Chinese Chess. By Fergus Duniho.
- Zhou Xia. Two decimal variants played with very powerful Xiangqi-like pieces. By Christine Bagley-Jones.
- Ziggurat . Mesopotamian-themed variant on a 43 square board. By Glenn Overby II.
- ZigZag Madness . Its madness when the standard chess pieces clash with ZigZag Bishop, ZigZag Rook, Ferz-Knight, Wazir-Knight and Ninja Pawns! By Charles Daniel.
- Zip Chess . After the first move, Pawns can advance any distance. Author: Gary Baydo. Inventor: Clifford Merry.
- Zone X . Chess with a special central Zone, a new piece, and new moves. By Roberto Lavieri.
- Zones of Action . Inspired form Lines of Action. By Yu Ren Dong.
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