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- mettamorphachess. Missing description (8x8, Cells: 64) By Eric S. Clayton.
- Mexican King Chess. Win the usual way or by making it safely to Mexico. Author: Ed Friedlander.
- Michael's Chess. An elaboration of Lord Dunsany's Chess with varying Pawn sides. By Roger Cooper.
- Michell's Proposal. Pawns may underpromote on next-to-last rank. Author: Ed Friedlander. Inventor: R. P. Michell.
- Michelson's Chess. Each side moves first a red unit, then a white unit. Author: Ed Friedlander.
- Mid-Evil Chess. A mid point between chess and shatranj. (8x8, Cells: 64) By Andy Maxson.
- Mighty-Lion Chess. Normal Chess augmented with a hard-to-trade Lion super-piece that can make double-captures. (8x8, Cells: 64) By H. G. Muller.
- Mike's Camel Chess . Lùotuoqí (Camel Chess) variant with more balanced pieces. By Michael Nelson.
- Miller's Spherical Chess. Play this early adaptation of Chess to a spherical board on Game Courier. Author: Fergus Duniho. Inventor: Don Miller.
- Mime Attack Chess . Pieces capture like the pieces they're capturing usually capture. By Adrian Alvarez de la Campa.
- Minefield Chess. Two of your squares have hidden mines that can destroy an enemy unit. Author: Ed Friedlander.
- Minesweeper chess. Missing description (8x8, Cells: 64) By Daniil Frolov.
- Minotaur Chess. Variant with board turned 45 degrees. (8x8, Cells: 64) By Frank M. Truelove.
- mir chess II. a variant of mir chess with same piece strength. (8x8, Cells: 64) By Andy Maxson.
- Missile Chess. Each non-king pieces or pawn may capture without moving once per game. (8x8, Cells: 64) Inventor: R. Wayne Schmittberger.
- Missile Chess. Each unit can rifle-capture once. Author: Ed Friedlander. Inventor: R. Wayne Schmittberger.
- Missile Chess. Missing description Author: Douglas Silfen. Inventor: R. Wayne Schmittberger.
- Missing the Mark. Making intentional errors. (8x8, Cells: 64) By Ralph Betza.
- Mobile Pawn Chess. Pawns have increased movement. By Tony Quintanilla.
- Mock Chess. No royal piece, mandatory captures. Author: Ed Friedlander.
- Mockery Chess. Missing description (8x8, Cells: 64) By Stephane Burkhart.
- Moderate Progressive Chess. A player may move one more piece than his opponent just moved. By Adrian Alvarez de la Campa.
- Moderate Progressive Chess. A player may make one more move than his opponent just made. (8x8, Cells: 64) By Adrian Alvarez de la Campa.
- Modern Chess960. chess960 with piece placement by players and orthodox castling. (8x8, Cells: 64) By Piotr Smagacz.
- Modest Proposals. An Introduction to Modest variants. By Tony Paletta.
- Modest Proposals - Various Authors. Missing description (8x8, Cells: 64) Author: Tony Paletta.
- Modest Variant.. Black may castle out of check. (8x8, Cells: 64) By Steven A Brown.
- Momentum Chess. Pieces keep moving in the same direction. (8x8, Cells: 64) By Ralph Betza.
- Mongredian Chess. Both bishops on queenside, both knights on kingside. Author: Ed Friedlander.
- Monkey Do Chess. If possible, make a second move with any unit. By Ed Friedlander.
- Monochromatic Chess. Pieces remain on squares of the same color. (8x8, Cells: 64) By Harry Pijls.
- Monochrome Chess . All pieces are the same color. Players move pieces on their side of the board. Author: David Howe. Inventor: Andrew Looney.
- Monochrome Chess. All units are of the same color. Win by accumulating captures. Author: Ed Friedlander. Inventor: Andrew Looney.
- Monster Chess Variants. A Discussion of the value of Double-Move pieces. (8x8, Cells: 64) Author: Ralph Betza.
- More Shifted Square Chess. Shifted Square Chess needs more than one page to explore its possibilities. (8x8, Cells: 64) By Ralph Betza.
- Moroccan Chess. If you have one or more captures, you must make a capture. Author: Ed Friedlander.
- Mortal Chessgi . A Chessgi game in which captures reduce material. By Fergus Duniho.
- Mortal Chessgi. Play this Chessgi variant in which each capture decreases material. By Fergus Duniho.
- Mortal Chessgi. A Chessgi game in which captures reduce material. (8x8, Cells: 64) By Fergus Duniho.
- Moscow King Chess. Board starts empty. Author: Ed Friedlander.
- Move as square says. Game with identical piece, movement depends on location. (8x8, Cells: 64) By Daniil Frolov.
- MRC64. Missing description (8x8, Cells: 64) By Jose Carrillo.
- MRC64. Modern Random Chess 64. By Jose Carrillo.
- Mrs. Graycheck's Chess. Pawns promote only to a unit already captured. Author: Ed Friedlander.
- Multi-King Chess. Missing description (8x8, Cells: 64) By Roberto Lavieri.
- Multimove Chess. Players spend points to make multiple moves. (8x8, Cells: 64) By David Howe.
- Multimove FIDE Chess. Each turn utilizes a number of points that get applied to movement. Author: Jeremy Gabriel Good. Inventor: David Howe.
- Multiple Formations. A proposal to add a set of formations to Chess. (8x8, Cells: 64) By Rich Hutnik.
- Multiple Occupancy Miscellany. Various chess variants with multiple pieces per square. (8x8, Cells: 64) By Ralph Betza.
- Multiple of 10 Checkmate. Variant where you can only checkmate or be checkmated on move 10, 20, 30, ect.. By Calvin Jack Pomerantz.
- Multiple of 10 Checkmate. Missing description (8x8, Cells: 64) By Calvin Jack Pomerantz.
- Musketeer Chess. Adding 2 newly designed extra pieces. (8x8, Cells: 64) By Zied Haddad.
- Must Capture Chess. Capturing is mandatory. Author: Roger Cooper.
- Mutation Chess. Units other than kings transform into whatever they capture. Queens do not move to give check. Author: Ed Friedlander. Inventor: John E. Bosley.
- Mutation Chess. Pieces that capture become the type of piece they captured. (8x8, Cells: 64) Author: Alessandro Castelli. Inventor: John E. Bosley.
- Mystery Chess. An imperfect information variant you can play online with Game Courier. Author: Fergus Duniho. Inventor: Ross Gillies.
- N-Relay Chess. Uncapturable Knights give other pieces the ability to move as Knights. (8x8, Cells: 64) Author: Alessandro Castelli. Inventor: Mannis Charosh.
- N-Relay Chess. Uncapturable Knights give other pieces the ability to move as Knights. Author: Pierre Tourigny. Inventor: Mannis Charosh.
- Nadvorney's Spherical Chess. Play Nadnorney's adaptation of Chess to a spherical board on Game Courier. Author: Fergus Duniho. Inventor: Leo Nadvorney.
- Near Chess. This is a variant of Skirmish Chess designed to be friendlier to newbies. (8x8, Cells: 64) By Rich Hutnik.
- Near Chess Preset. This is the preset for Near Chess. By Rich Hutnik.
- Near vs Normal Chess. This version pits pieces of Near Chess vs those of normal chess (FIDE). (8x8, Cells: 64) By Rich Hutnik.
- Nearly Anywhere Chess. Pieces teleport anywhere without capturing or checking. Author: Ed Friedlander. Inventor: Edward Jackman.
- 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.
- Necromancer Chess. The Undead Walk. (8x8, Cells: 64) By Larry L. Smith.
- Nemoroth, The Game of. For the sake of your sanity, do not read this variant! (8x8, Cells: 64) By Ralph Betza.
- Nemoroth. A Visit to. Ralph visits Nemoroth in a dream, and reports a game by its greatest champion. By Ralph Betza.
- Neoclassical Chess. The opening moves are selected through a random ballot. By Gabriel F. Bobadilla.
- NeoSchaak. Load your own units, onto the first two ranks, as you like during the game. Author: Ed Friedlander.
- Neoteric Chess. Pieces are swapped before play begins. An external piece is introduced (with zrf). By M Winther.
- Net Chess. Variant of InterGrid Chess. Move between intersections. (8x8, Cells: 64) By Tony Quintanilla.
- Net Chess . This game allows pieces to move to the grid intersections and between intersections. By Tony Quintanilla.
- Neutral King Chess. Missing description Author: Ed Friedlander. Inventor: Vernon Rylands Parton.
- Neutral King Chess. V.R. Parton's game where two armies share a King both must try to mate. (8x8, Cells: 64) Author: Peter Aronson. Inventor: Vernon Rylands Parton.
- 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.
- Neutral King Chess. V.R. Parton's game where two armies share a King both must try to mate. Author: Antoine Fourrière. Inventor: Vernon Rylands Parton.
- Neutral Subject Chess. Most pieces start neutral, and players compete to recruit them. (8x8, Cells: 64) By Charles Gilman.
- new age chess. a game played with the same board and set but with different rules. (8x8, Cells: 64) By Andy Maxson.
- New Chess. Drop-chess with pawn relocation. Standard pieces and rules. Ideal for avoiding opening theory. By M Winther.
- New Types of Progressive Chess. Several new progressive chess variants. (8x8, Cells: 64) By Ralph Betza.
- Nietzsche Chess. That which does not capture a piece, makes it stronger. (8x8, Cells: 64) By Charles Gilman.
- Nine Riders Chess. Each piece is a rider. Author: Ed Friedlander. Inventor: Philip M. Cohen.
- Nine-Queen Chess. Queens are placed instead of Pawns. Author: Tony Quintanilla. Inventor: Eric Beck.
- Nine-Queen Chess. Queens are placed instead of Pawns. (8x8, Cells: 64) Inventor: Eric Beck.
- Ninth Century Indian Chess. Differs from Shatranj in the setup and the Elephant's move. Author: Tony Quintanilla and John Ayer.
- Ninth Century Indian Chess. Differs from Shatranj in the setup and the Elephant's move. (8x8, Cells: 64) Author: John Ayer.
- No Entry Chess. Bar the opponent's access to one square after each of your moves. Author: Ed Friedlander. Inventor: David B. Pritchard.
- No Limit Bet Chess. A gambling multi-move chess variant played with dice that allows players to place bets on each move. (8x8, Cells: 64) By Charles Daniel.
- No-Chess. Forbid one move to your opponent each turn. (8x8, Cells: 64) Author: Zoltan Blazsik and Hans L. Bodlaender. Inventor: Zoltan Blazsik.
- No-Retreating Chess. A varient where you can't retreat until you get to the last rank. (8x8, Cells: 64) By Calvin Jack Pomerantz.
- Noble WingS Chess. Missing description (8x8, Cells: 64) By Mark Simpson.
- Non-prise Chess. Queens, rooks, knights, and bishops cannot take each other. (8x8, Cells: 64) By Bruce Zimov.
- Non-Prise Chess. Only kings and pawns can capture queens, rooks, bishops, or knights. Author: Ed Friedlander. Inventor: Bruce Zimov.
- Nonary Chess. King or queen are optionally swapped with a bishop before play begins (with zrf). By M Winther.
- Norwegian Chess. Q/N and B/R transform after each move. Author: Ed Friedlander.
- Nuclear Chess . Program that plays Nuclear Chess on Linux or Mac OS X. Author: Harald Bartel. Inventor: Jason Shields.
- Nuclear Chess. When pieces take, the square becomes impassable and all surrounding pieces disappear. (8x8, Cells: 64) By Jason Shields.
- Nuclear Chess. Play Nuclear Chess on the Play-By-Mail System! Author: Jason Shields and Tony Quintanilla. Inventor: Jason Shields.
- Nuclear Chess Play-By-Mail game. Examine this game! Author: Jason Shields and Tony Quintanilla. Inventor: Jason Shields.
- Null chess. Capture squares are destroyed when vacated. Author: Ben M Reiniger. Inventor: Philip M. Cohen.
- Null Chess. Squares on which captures have taken place can no longer be visited. Author: Ed Friedlander. Inventor: Philip M. Cohen.
- Numericron Chess. Score points by attacking enemy units. Author: Ed Friedlander. Inventor: Bruce Trove.
- Nuthouse . Missing description By Yu Ren Dong.
- Nuthouse. Missing description (2x(8x8), Cells: 128) By Yu Ren Dong.
- ObstructionChess. A new chess variant designed to challenge old strategies and improve your chess play with logical and organic obstructions. (8x8, Cells: 64) By martin rinab.
- Odds Chess . Ways of giving a weaker opponent better odds. Author: Roger Cooper.
- Odds Chess. Ways of giving a weaker opponent better odds. (8x8, Cells: 64) Author: Roger Cooper.
- Off Board Chess Pieces. Each side has off board pieces which can be used only once in a game. By Ronald Drinning.
- Official Football Chess. Variant from the 1960's with pieces replaced by football players. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- OK Chess . After the first move, Pawns can advance any distance. Author: Gary Baydo. Inventor: Clifford Merry.
- One or Two. Make a normal move, or denote two pieces for which your opponent chooses how they must be moved. (8x8, Cells: 64) By Ralph Betza.
- One Way Chess . Missing description By Adrian Alvarez de la Campa.
- OOmost Chess. All movement in this variant is a form of castling. (8x8, Cells: 64) By Ralph Betza.
- Option Chess. Missing description (8x8, Cells: 64) Author: (zzo38) A. Black. Inventor: Paul Bonham.
- Option-Suicide Chess. You can optionally destroy your own pieces. (8x8, Cells: 64) By (zzo38) A. Black.
- Orda Chess. Asymmetric variant where one army has pieces that move like knights but capture differently. By Daniel Lee.
- Orphic Chess. Before the King is dropped the pieces can only capture. A very tactical and fast variant. By M Winther.
- Outpost Chess. Win by occupying a designated square in enemy territory for one move. Author: Ed Friedlander.
- Overkill Chess. Paired pieces are compounds of 2 FIDE elements, King's partner of all three. (8x8, Cells: 64) By Charles Gilman.
- OverKnight Chess. Pawns are replaced by Knights, which promote. Author: Tony Quintanilla
- OverKnight Chess. Pawns are replaced by Knights, which promote. Author: Ed Friedlander.
- OverKnight Chess. Pawns are replaced by Knights, which promote. (8x8, Cells: 64)
- Overprotection Chess. If an attacked piece is more often defended than it is attacked, it gains extra powers. (8x8, Cells: 64) By Ralph Betza.
- P.O.C.: Progressive 007 Chess. Which pieces one moves are determined by throwing dice. (8x8, Cells: 64) Author: Bill Taylor.
- 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.
- Palace Ninja Guards. A pair of short-range diagonal leapers and four extra squares are added to the standard chessboard and pieces. (8x8, Cells: 68) By Charles Daniel.
- 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.
- Paletta's Modest ARRAY variants. Missing description (8x8, Cells: 64) By Tony Paletta.
- Paletta's Modest CAPTURE RULE variants. Missing description (8x8, Cells: 64) By Tony Paletta.
- Paletta's Modest GOAL variants. Missing description (8x8, Cells: 64) By Tony Paletta.
- Paletta's Modest MOVEMENT RULE variants. Missing description (8x8, Cells: 64) By Tony Paletta.
- Paletta's Modest PAWN variants. Missing description (8x8, Cells: 64) By Tony Paletta.
- Paletta's Modest PIECE variants. Missing description (8x8, Cells: 64) By Tony Paletta.
- Paletta's Modest TURN variants. Missing description (8x8, Cells: 64) By Tony Paletta.
- Palindromic Chess. Play until the position on the board is the reversed of the starting postion. (8x8, Cells: 64) By David Howe.
- Paloma Chess. Game with Royal Queen, promotable Kings, and an unusual array. Author: Tony Quintanilla. Inventor: Becca Rabong.
- Paloma Chess. Game with Royal Queen, promotable Kings, and an unusual array. (8x8, Cells: 64) and Becca Rabong. Inventor: Becca Rabong.
- Parachute Anywhere Chess. Pieces teleport anywhere without capturing or threatening pieces. Author: Ed Friedlander. Inventor: Edward Jackman.
- Paradigm Chess30. Chess with Dragon Bishop and 30 positions. By Craig Willenberg and Lourenzo Van Niekerk.
- Patrol Chess. A unit may not capture or give check unless it is supported. Author: Ed Friedlander. Inventor: Federik Hendrik von Meyenfeldt.
- Patrol chess. In order to capture or give check, a piece [including kings] must be `observed' by another piece of the same player. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Federik Hendrik von Meyenfeldt.
- Patrol chess. More problems from CCM. Author: Juraj Lörinc.
- Patt-schach (Stalemate chess). Players start with an illegal move from a stalemated position. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- 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. (8x8, Cells: 64) By David Paulowich.
- 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 Blackhole Chess. Each side is split into two and grouped into corners. Pawns play towards the center. Author: Nemo Thorx. Inventor: Nemo Thorx and Adam Corbally.
- Pawn Chess. Pawns promote to first piece captured by opponent. (8x8, Cells: 64) Author: (zzo38) A. Black.
- Pawn Massacre Chess. Black pieces start behind white pawns and vice versa. Author: Ed Friedlander. Inventor: Jeff `Cavebear` Stroud.
- Pawn Massacre Chess. Non-pawn pieces swap initial ranks. By Jeff `Cavebear` Stroud.
- Pawn Odds Chess. White starts without the king's bishop's pawn. Author: Ed Friedlander.
- Pawn Progression Chess. Pawns on advanced ranks move differently. Author: Ed Friedlander.
- 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 Shooter Chess. Defeat your opponent by shooting pawns at them! (8x8, Cells: 64) By (zzo38) A. Black.
- Pawn-Only Chess. Training chess variant. Only pawns, first promotion wins. (8x8, Cells: 64) Author: Pavel Tikhomirov.
- 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.
- Pawns-to-Kings Chess. Missing description (8x8, Cells: 64) By Patrik Hedman.
- Pawntrooper chess. Missing description (8x8, Cells: 64) By Karl Prosser.
- Peasant Revolt. Modest variant with unequal setup. Author: Tony Quintanilla. Inventor: George Whelan.
- Peasant Revolt. Modest variant with unequal setup. (8x8, Cells: 64) Author: George Whelan. Inventor: R. L. Frey.
- Peasant Revolt Chess. Eight pawns vs. three knights and pawn. Author: Ed Friedlander. Inventor: R. L. Frey.
- Perier Chess. Introducing the Perier Cannon in a Western piece context (with zrf). By M Winther.
- Perimeter Chess . Pieces other than Pawns and Kings move differently when moving to or from edge squares. Author: Marek14 . Inventor: Tony Paletta.
- Phalanx Chess. Introducing the Phalanx pawn that can swap place with piece in front (with zrf). By M Winther.
- Phantom. Classical Chess featuring an invisible Phantom piece. By Simon Edward Jepps.
- Phantom Chess. Undefended pieces become "phantoms". (8x8, Cells: 64) By Adrian Alvarez de la Campa.
- PieceEater Chess. Yet another game with an indestructible randomly-wandering neutral piece. (8x8, Cells: 64) By Peter Aronson.
- PieceEater Chess . Yet another game with an indestructible randomly-wandering neutral piece. By Peter Aronson.
- Pied Color Chess. Oh no! All the colors on the board have been scrambled -- however will the pieces move? (8x8, Cells: 64) By Ralph Betza.
- Pierre Menard's Chess Variant. As described by Jorge Luis Borges. By Jeff Rients.
- Pilgrim Chess. A new method of introducing an extra piece to the standard board (with zrf). By M Winther.
- Pillar Chess. Variant with elements from Pillar Checkers. Captured pieces are stacked beneath the capturing piece, stacks can be split. (8x8, Cells: 64) Author: Sergey Sirotkin.
- Pillow Chess . Chess on a Pillow-shaped board. Author: Abdul-Rahman Sibahi. Inventor: Grant Cairns.
- Pink Chess. White has two Kings, black two Queens as royal pieces. By H. G. Muller.
- Pioneer Chess. A new method of introducing an external piece on the orthodox board (with zrf). By M Winther.
- Pioneers Chess. An elegant solution to draws in chess. (8x8, Cells: 64) By Luis Bolaños Mures.
- Pitcher Chess. Introducing the Pitcher pawn that can catapult posterior piece. By M Winther.
- Placement. Only kings start on board; other pieces are dropped to home square and then moved. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Walter Weiss.
- Placement Chess. King and queen are swapped with another piece, except rook, and creating a new mirrored position (with zrf). By M Winther.
- Placement Chess. King and queen are swapped before play begins, generating FRC subset (with zrf). By M Winther.
- Placement Random Chess (Chess 20). The piece setup is randomized following Placement Chess rules, generating 20 modest Fischer Random positions. By M Winther.
- Plaid Chess. Progressive Grid chess. Author: Ed Friedlander. Inventor: W. H. Rawlings.
- Platform Chess . Pieces move normally or ride on 2x2 platforms that move themselves. By Robert Price.
- Platform Chess. Pieces move normally or ride on 2x2 platforms that move themselves. (8x8, Cells: 64) By Robert Price.
- PlunderChess . Commercial chess variant where pieces gain right to move like a piece they captured. Inventor: Jeff Knight.
- Plunderchess: Pictures and a review. Commercial variants where capturing gains the right to move once as the captured piece. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Jeff Knight.
- Plutonian Test Chess. Fictitious Variant for Testing Purposes. By Steven Streetman.
- 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 Mutation Chess. Take one of your pieces off the board, maybe change it, keep it in reserve, and drop it on the board later. (8x8, Cells: 64) (Recognized!) By Michael Nelson.
- 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. Author: Tony Quintanilla and Fergus Duniho. Inventor: Michael Nelson.
- Pocket pieces thematic tourney. Chess problem composition tournament. Closing date April 30, 2002. Author: Juraj Lörinc.
- Poison Pawn Chess. Capture the wrong pawn and you lose. Author: calebmcc111. Inventor: Samay Raina.
- Poker Chess. Squares contain cards, and players win by forming poker hands with the cards on the squares occupied by their pieces. (8x8, Cells: 64) By Ralph Betza.
- Pole Chess. Missing description (8x8, Cells: 64) Author: Mark Thompson. Inventor: Piers Anthony.
- 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.
- Polymorph Chess . Knights and Bishops can morph into each other or into combined pieces. By Greg Strong.
- Polymorph Chess. Knights and Bishops can morph into each other or into combined pieces. Author: Tony Quintanilla. Inventor: Greg Strong.
- Polymorph Chess. Knights and Bishops can morph into each other or into combined pieces. (8x8, Cells: 64) By Greg Strong.
- Polypiece Chess. Each time a piece moves, all pieces of that type on both sides change their move. (8x8, Cells: 64) By Ralph Betza.
- Portal Chess. Two boards and pieces can teleport from one board to another. Also playable with two half-boards. (8x8, Cells: 64) By David Howe.
- Portugese Progressive Chess. Progressive chess variant where you move each piece at most once. (8x8, Cells: 64) By João Pedro Neto.
- Pot-Hole Chess. Game where pot-holes open up on the board at random times. (8x8, Cells: 64) Author: Peter Spicer and Michael Chamberlain. Inventor: Peter Spicer.
- Potential/Demotion Chess . Pieces may move like lower-ranked piece, but when doing so, become that lower ranked piece. By Peter Aronson.
- Potential/Demotion Chess. Pieces may move like lower-ranked piece, but when doing so, become that lower ranked piece. (8x8, Cells: 64) By Peter Aronson.
- Power Mover. A variant of Hostage Chess with self-capture, promotion and demotion. (8x8, Cells: 64) By Kazuto Asai.
- Presto chess. First player who checks with untakable piece wins. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Lawrence Crane.
- Pretentious Chess. All Pieces can move as and demote to a Knight. (8x8, Cells: 64) By Adrian Alvarez de la Campa.
- Pretentious Chess. Pieces can move as and demote to a Knight. By Adrian Alvarez de la Campa.
- Prime.Ministers Contemporary Random Chess. Missing description (8x8, Cells: 64) By Jose Carrillo.
- Primitive Chess . Short-range major pieces and no pawns, but a piece like an apprentice for each major piece. Author: Marek14 . Inventor: Köksal Karakus.
- Primitive Chess. Short-range major pieces and no pawns, but a piece like an apprentice for each major piece. (8x8, Cells: 64) By Köksal Karakus.
- 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.
- Prisoners. Captured pieces move to second chess board. By Ronald Drinning.
- ProCycle Chess. Individual pieces promote one by level after each played move. By Ken Franklin.
- Progression. Instead of promoting, pawns gain powers when they advance. (8x8, Cells: 64) Author: John Love-Jensen.
- Progressive 007 Chess. Players play increasing numbers of moves each turn, but which color you move simply alternates. Author: Ed Friedlander.
- Progressive Absorption Chess. Very popular in Italy. Author: Ed Friedlander.
- Progressive Chess. Several variants where white moves one time, black twice, white three times, etc. (8x8, Cells: 64) (Recognized!) Author: Alessandro Castelli.
- Progressive Chess . A collection of variants with increasing numbers of moves each turn. Author: Young-Hyun Joo.
- Progressive Chess . An online guide to Progressive Chess. Author: Doug Hyatt.
- Progressive Forwards Chess. Progressive chess where pieces may only move forwards. (8x8, Cells: 64) By Hans L. Bodlaender.
- Progressive Give-Away Chess. Giveaway chess played in progressive fashion. (8x8, Cells: 64) Author: Andrea Mori and Alessandro Castelli.
- Progressive Mutation Chess. Missing description Author: Ed Friedlander.
- Progressive Writing Chess. You have to write more and more each turn. (8x8, Cells: 64) By (zzo38) A. Black.
- Promote King Chess. King can promote into Cthulhu, and white pawns can promote into black pawns. (8x8, Cells: 64) By (zzo38) A. Black.
- Promotion progressive chess. Progressive chess variant where a piece `promotes' when it takes. (8x8, Cells: 64) By Fabio Forzoni.
- Proselyte Chess. Missing description (8x8, Cells: 64) By Larry L. Smith.
- Proximity Chess. Players must move pieces nearest to the arrival square of the last piece moved. (8x8, Cells: 64) Author: Greg Strong. Inventor: W. H. Rawlings.
- Push Chess . Pieces don't capture, but instead push each other off of the board. Author: Marek14 . Inventor: Fred Galvin.
- Push Chess. Pieces don't capture, but instead push each other off of the board. Author: Ed Friedlander. Inventor: Fred Galvin.
- Putback Chess. A slight variation of Replacement Chess. Captured pieces must be put on an empty square on the board. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- Pyrrhus Chess. The Pyrrhus moves like a king but paralyzes enemy pieces at queen's distance (with zrf). By M Winther.
- Quang Trung Chess (4th edition). Variant with standard equipment, with different moving pieces, and elements of Xiangqi and FIDE-chess. (8x8, Cells: 64) By Vu Q Vo.
- Quantum Chess. Chess with a quantum mechanical twist. By Stephen Tavener.
- Quantum Chess. Chess meets Quantum Physics. Author: Fergus Duniho.
- Quantum Chess. Pieces may teleport, provided their start and end squares are unobserved. Author: Ed Friedlander. Inventor: Stephen Tavener.
- Quapent. Missing description By Joe Watson.
- Quarter Chess. Missing description (8x8, Cells: 64) By Patrik Hedman.
- Queen of the Night Chess. An over powered game on the Standard Board. By Abdul-Rahman Sibahi.
- Queens Left Chess. Black king and queen reverse position in setup. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- Quest-Chess. Players make 10 moves per turn but opponents get chance to react on checks and taking of pieces in between. (8x8, Cells: 64)
- R-Chess . Captured pieces are held in reserve and then dropped. By Marcello Netto.
- Race Chess. On a circular board where white and black pawns move in the same direction. (8x8, Cells: 64) By Ralph Betza.
- Racing Kings. Missing description By Abdul-Rahman Sibahi.
- Racing Kings. From a special setup, be the first to have your king reach the last row. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Vernon Rylands Parton.
- Radioactive Queen Chess. White has a little diff in setup, but great diff in the game. (8x8, Cells: 64) By Lev Grigoriev.
- Raft Chess. Part of the board is a lake, where rafts can transport pieces. (8x8, Cells: 64) Author: Jörg Knappen.
- Random Move Number Chess. A die now controls the number of moves a player makes each turn. Luck and skill required to win! (8x8, Cells: 64) By Charles Daniel.
- Random Pawns. Randomly select your Pawns' movement and capture abilities. (8x8, Cells: 64) By Gavin King.
- Random Pieces. A 20 game match is played, with each player receiving a number of pieces equal in value to the game number. (8x8, Cells: 64) By Roger Cooper.
- Random Transposal Chess. Use dice to swap pieces. (8x8, Cells: 64) By John Smith.
- Random Wormhole Chess. Introduces "wormholes" and "toroidal" movement in a fun and manageable way. (8x8, Cells: 64) By Adrian Alvarez de la Campa.
- Randomscorpions Chess. The Scorpions are randomly distributed on the 2nd and 3rd rank. Otherwise regular setup. By M Winther.
- Rank and File Chess. Move from Most Crowded Row. (8x8, Cells: 64) By George William Duke.
- Raven Chess. Kings move like queens and leap over friendly pieces, but cannot move through check. (8x8, Cells: 64) Author: John Love-Jensen. Inventor: John Love-Jensen and Richard .
- Ready Chess. Play this game, where pieces cannot capture right after capturing, they have to be restored first! By Tony Quintanilla.
- Ready Chess. Pieces cannot capture right after capturing, they have to be restored first. (8x8, Cells: 64) By Tony Quintanilla.
- Ready Chess. A move must be used to restore a unit's ability to capture, except for the king. Author: Ed Friedlander. Inventor: Tony Quintanilla.
- Ready Chess . Pieces cannot capture right after capturing, they have to be restored first. By Tony Quintanilla.
- Real chess. Players start with placing their major pieces. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: E. I. Csaszar.
- Realm chess. Board is divided into realms and multiple pieces can move into and out of a realm in one turn. (8x8, Cells: 64) By Edward Jackman.
- Rebel Chess. King's Pawn is replaced by Recruiter piece that moves like an Alfil and can change a piece's side. (8x8, Cells: 64)
- 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.
- Rebellion chess. Besides normal moves, you can move a piece of the opponent. (8x8, Cells: 64) By Ralph Betza.
- Recapitulative Chess. Variant where the Queen, Rook and Bishop have their older moves until promoted. (8x8, Cells: 64) By Charles Gilman.
- Recapturable Chess. Captured pieces belong to other player and then removed permanently. (8x8, Cells: 64) By (zzo38) A. Black.
- Recaptureless Chess. A unit which has just captured is itself invulnerable to capture for the move. Author: Ed Friedlander. Inventor: Tony Paletta.
- Rectahex Chesss. A chess variant that looks like hexagonal chess but can be played on a normal chess board. (8x8, Cells: 64) By Ralph Betza.
- Recycle Chess. You may capture your own units and replace them on the board. Author: Ed Friedlander. Inventor: Robert Huber.
- Recycle Chess. Players can capture and drop their own pieces. (8x8, Cells: 64) By Robert Huber.
- Red Castle Chess. Red king and QR cannot move except to castle, which wins for Red. Author: Ed Friedlander.
- Reduced Endgame Chess. Two kings and six pawns are used for practicing endgames. (8x8, Cells: 64) Author: David Howe.
- Reduced Endgame Chess . Two kings and six pawns are used for practicing endgames. Author: Uwe Wiedemann.
- Reflex Chess. Force your opponent to checkmate. Author: Ed Friedlander. Inventor: William Geary.
- Reflex Chess. Force your opponent to mate you. (8x8, Cells: 64) Author: David Howe. Inventor: William Geary.
- Reformed Chess. Introducing a new pawn swapping capability intended to solve the problem of drawishness in chess (with zrf). By M Winther.
- Reformed Chess. Pawn can swap with an enemy piece located on the last rank, except king. Thusly, many more won endgames (zrf available). By M Winther.
- Refusal Chess. Refuse your opponent to make certain moves. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Fred Galvin.
- Refuse Once Chess. You may refuse one enemy move per game. By Ed Friedlander.
- Regement Random Chess. Pieces are relocated to create a modest setup that most chessplayers will feel at home in (+ zrf). By M Winther.
- Regiment Chess. Black determines king position, white can swap the queen before play begins (with zrf). By M Winther.
- Relative Lumberjack. Pieces move the same as other pieces in its file. (8x8, Cells: 64) By John Smith.
- Relativistic Chess. Squares attacked by the opponent are considered not to exist. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Kevin Whyte.
- Relativistic Chess. http://www.chessvariants.org/boardrules.dir/relativistic.html. By Carlos Cetina.
- Relativistic Chess. Squares attacked by the opponent are considered not to exist. Author: Robert Price. Inventor: Kevin Whyte.
- Relocation Chess. A remarkably easy method of rearranging the standard array of pieces (with zrf). By M Winther.
- Relocation Chess. Swap a pair of your own pieces before you begin. With Fischer Random castling rules. By M Winther.
- Rental Chess. You must pay rent for the squares where your pieces are: centre squares are more expensive. (8x8, Cells: 64) By Ralph Betza.
- Repatriation Chess. Pairs of captured units are returned to the board. Author: Ed Friedlander. Inventor: Tony Paletta.
- Repeating Chess. Usually called Replacement Chess. Captured pieces must be put on an empty square on the board. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- Replacement Chess. Replace your opponent's men on the board after you capture them. Author: Kevin Pacey.
- Reserve Chess. Units may be removed from the board and dropped back in later. Author: Ed Friedlander. Inventor: Edward Jackman.
- Retreating Chess. Pieces must fall back one square after each move. (8x8, Cells: 64) By Adrian Alvarez de la Campa.
- Retro Chess. A chess game progresses backwards from an empty board. (8x8, Cells: 64) By Mike Smolowitz.
- Rettah. Different setup and powerfull king. Taking obligatory when in check. (8x8, Cells: 64) Author: Vu Q Vo. Inventor: Vernon Rylands Parton.
- Rettah Chess. King can move as any piece but must capture its attacker. Author: Ed Friedlander. Inventor: Vernon Rylands Parton.
- Revenge of the King. http://xn--perlebr-bxa.de/2010/02/Vergeltung-des-K%C3%B6nigs. (8x8, Cells: 64) By Martin Janecke.
- Revised Chess. The pawn can also capture forwards if positioned on 7th rank. Thus, many more won endgames (zrf included). By M Winther.
- Revised Chess. A revision of Fide-chess: a pawn on the seventh rank can also capture forwards. Makes chess much less drawish (with zrf). By M Winther.
- Rifle Chess. Units capture without moving. Author: Ed Friedlander. Inventor: W. B. Seabrook.
- Rifle Chess . Pieces are taken by shooting: capturing without moving. Author: Robert Price. Inventor: W. B. Seabrook.
- Rifle Chess. Take a move to capture an enemy piece without moving the capturing piece. Author: Kevin Pacey. Inventor: W. B. Seabrook.
- Rifle Chess. Pieces are taken by shooting: capturing without moving. (8x8, Cells: 64) Author: Hans L. Bodlaender. 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. Win by getting a piece to the opposite side. Author: Ed Friedlander. Inventor: Karl Scherer.
- 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.
- Rogue Pawn Chess . Pawns may double-move on any rank except for their starting rank. Author: Marek14 . Inventor: Tony Paletta.
- Rolling Kings. Play Rolling Kings online with Game Courier. Author: Antoine Fourrière. Inventor: Peter Aronson.
- Rolling Kings. Kings must move along a predetermined path. (8x8, Cells: 64) By Peter Aronson.
- Rolling Kings . Kings must move along a predetermined path. By Peter Aronson.
- Romanchenko's Chess. FIDE Chess trainer Romanchenko shifted the FIDE board in the middle to help his students think for themselves. Author: Jeremy Gabriel Good and Fergus Duniho. Inventor: V. Romanchenko.
- Rook Square Chess. Enemy rook squares are royal. Author: Ed Friedlander. Inventor: Jens Baek Nielsen.
- Rookheavy Chess and Bishopheavy Chess. combining elements of Lilliputian Chess, Isis, Mongolian Chess, and crooked linepieces. (8x8, Cells: 64) By Charles Gilman.
- Rooksquare Chess. Win by moving piece to corner at opponent's side. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Jens Baek Nielsen.
- Rooksquare Chess . Win by moving piece to corner at opponent's side. Author: Uwe Wiedemann. Inventor: Jens Baek Nielsen.
- Rotating Cylinder Chess. Positions of pieces rotate one square to the right after each move. (8x8, Cells: 64) By John Smith.
- Rotation Chess. Every 10th move, the board is turned around. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- Rotation Chess. Every ten moves, switch sides with your opponent. How might you prepare for the demise of the pieces you are playing? Author: Jeremy Gabriel Good and Adrian Alvarez de la Campa.
- Rotation Chess. Every ten turns, you switch and play the other player's units. Author: Ed Friedlander.
- Royal Amazon Chess . Queens are replaced by Royal Amazons. By Peter Aronson.
- Royal Amazon Chess. Queens are replaced by Royal Amazons. (8x8, Cells: 64) By Peter Aronson.
- Royal Bishop Chess. Simple variant with royal bishop. (8x8, Cells: 64) By QIDb602.
- Royal CannonChess. Pieces next to the king can capture forwards by a cannon leap. By M Winther.
- Royal Magician Chess. Missing description Author: Ed Friedlander. Inventor: Gary K. Gifford.
- Royal Magician's Chess. King and special magician piece earn the right to drop pieces when they venture out to the fourth, fifth and sixth ranks! Author: Jeremy Gabriel Good. Inventor: Gary K. Gifford.
- Royal Magician's Chess. Missing description (8x8, Cells: 64) By Gary K. Gifford.
- Royal Pawn. Missing description Author: Ed Friedlander. Inventor: Jeremy Gabriel Good.
- Royal Pawn Chess. Same as FIDE Chess, except the pawns in front of the kings are royal, meaning the object is to checkmate them and not the king. By Jeremy Gabriel Good.
- 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. (8x8, Cells: 64) By Adam Norberg.
- Rubble Chess. Pieces must clear out unoccupied squares before they can move through them. Author: Ed Friedlander. Inventor: Adam Norberg.
- 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.
- Ruddigore Chess. Play this Chessgi variant where you can capture your own pieces, and every other turn you must capture or sacrifice a piece! Author: Tony Quintanilla and Peter Aronson. Inventor: Peter Aronson.
- Ruddigore Chess. Chessgi variant where you can capture your own pieces, and every other turn you must capture or sacrifice a piece. (8x8, Cells: 64) By Peter Aronson.
- Russian Chess. Pieces are not removed when captured, but stacked. (8x8, Cells: 64) Author: Ivan Derzhanski.
- Russian progressive chess. Progressive chess variants where one occasionally moves a piece of the opponent. (8x8, Cells: 64) By Sergey Sirotkin.
- Sacred King Chess . It is not legal to check your opponent's King, so victory is by stalemate or bare King. By Peter Aronson.
- Sacrifice chess. Instead of a normal move, you may sacrifice a pawn. (8x8, Cells: 64) By Robert Shimmin.
- Safe Passage. Move pieces to opposite side without putting pieces in danger of capture. By Karen Robinson.
- Sai squad. A very experimental army for Chess with different armies, featuring the Sai (Bishop-Quintessence compound). (8x8, Cells: 64) By Jörg Knappen.
- Sanctuary Chess. Archbishop and Swiss Guard replace Queen and King; no checkmate. Author: Tony Quintanilla
- Sanctuary Chess. Archbishop and Swiss Guard replace Queen and King; no checkmate. Author: Ed Friedlander.
- Sanctuary Chess. Archbishop and Swiss Guard replace Queen and King; no checkmate. (8x8, Cells: 64)
- SC-Chess. Variant of Hostage Chess which allows self-capture and other minor rule changes. (8x8, Cells: 64) By Kazuto Asai.
- Schach-B. One selected from among the Fischer Random boards, also known as Fischer Random position # 542. Author: Jeremy Gabriel Good. Inventor: M Winther.
- Schachdame. Variant between Checkers and Chess. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Heinrich Richter.
- Schachdame Chess. Pawns, a bishop, and a royal ferz. Author: Ed Friedlander. Inventor: Heinrich Richter.
- Scorpion Chess. Poisonous Scorpions instead of pawns. By M Winther.
- Scorpion King Chess. King can also move as grasshopper. Author: Ed Friedlander.
- Scotch Chess. Missing description Author: Ed Friedlander.
- Scottish Progressive Chess. White moves one time, black twice, white three times, etc. Series ends when check is given. (8x8, Cells: 64) Author: Alessandro Castelli.
- Secret Agent Chess. Each player chooses one opposing minor piece to be a secret agent. (8x8, Cells: 64) By Ralph Betza.
- Secret Stallmate. Both players win if stalemated, but information is secret and setup is random. (8x8, Cells: 64) By (zzo38) A. Black.
- Self Eliminator. You are allowed to take your own pieces. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: John Gallicano.
- Sentinel Chess. Instead of queens, players have sentinels who can transform into 8 pawns. (8x8, Cells: 64)
- Separate. Queens start trapped behind enemy lines. (8x8, Cells: 64) By Brian Wong.
- 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.
- 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. (8x8, Cells: 64) By Peter Aronson and Michael Nelson.
- 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: Tony Quintanilla. Inventor: Michael Nelson and Peter Aronson.
- Separate Realms Chess II. A Variant of Separate Realms Chess with standard FIDE King, and more powerful Knights and Queens. (8x8, Cells: 64) By Jörg Knappen.
- Seventeen Pawns. You can replace opponent's queen by nine pawns. (8x8, Cells: 64) By (zzo38) A. Black.
- Shamanic Chess. Pieces may be transformed into 'Shamans'. By M Winther.
- Shamanic Chess . Pieces may be transformed into 'Shamans'. By M Winther.
- Shambhala chess. Maybe, it's the misterious first form of chess? Actually, most probably, not. (8x8, Cells: 64) By Daniil Frolov.
- Share Squares. AKA Two's Company; Three's a Crowd. By JT K.
- Sharp Chess. Drawless Chess with minor victory conditions. (8x8, Cells: 64) By Daniel Zacharias.
- Shatar, Old 1 Hia. Old Shatar with one Hia. (8x8, Cells: 64) By Gary K. Gifford.
- Shatranj Extended Tournament Scoring (S.E.T.S) Rules. An attempt at an improved scoring system for chess tournaments. (8x8, Cells: 64) By Rich Hutnik.
- Shatranji. A hybrid of Shatranj and Chessgi. (8x8, Cells: 64) By Fergus Duniho.
- Shifted Square Chess. One square is removed from the normal playing area and one square is added at the edge of the normal playing area. (8x8, Cells: 64) By Ralph Betza.
- Shogun Chess. Pieces promote and can be dropped, similar to Shogi. By Daniel Lee.
- Shoot Chess. Rifle chess with mandatory captures. Author: Ed Friedlander.
- Short Leaper Chess. Missing description (8x8, Cells: 64) By Petar Djurickovic.
- The short splicers. An experimental chess with different armies army. (8x8, Cells: 64) By Andy Maxson.
- Showdown Chess. No draws permitted. (8x8, Cells: 64) By Devin .
- Shrink Chess. The board is shrinking. (8x8, Cells: 64) Author: Pepijn van Erp and Hans L. Bodlaender.
- 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.
- Simplified chess. Simple subset of the chess rules. (8x8, Cells: 64) By Michiel Tas.
- Simplified Makpong. Makruk variant. By Henk Drost.
- Simultaneous Chess. A variant of chess where players select moves at same time. (8x8, Cells: 64) By Rich Hutnik.
- Single check chess. Checking the opponent wins the game. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- Sirlin's Chess. Alternative presentation of "Chess 2 - The Sequel". (8x8, Cells: 64) Author: (zzo38) A. Black. Inventor: David Sirlin.
- Sixteen Pawns. Trade a queen for 8 extra pawn. (8x8, Cells: 64) Author: Ralph Betza. Inventor: M. de Kemur.
- Sjeng : a chess-and-variants playing program . Freeware program that plays chess and some variants, like giveaway chess and bughouse.
- Skirmish Chess. Tony Paletta Modest proposal as separate link for discussion. (8x8, Cells: 64) Author: Rich Hutnik. Inventor: Tony Paletta.
- 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.
- Skirmish Chess. Pawns start on the 3rd and 6th ranks with no double-move, pieces on the 2nd and 7th ranks. Author: Ed Friedlander. Inventor: Tony Paletta.
- Skock. 64 pieces on an 8 x 8 board. Dice determine how far pieces can be moved. (8x8, Cells: 64) By Ulf Göransson.
- Slide-shuffle. Variation of Shuffle Chess with special castling. (8x8, Cells: 64) By Patrick O'Neal.
- Sneaky. A WinBoard Compatible Chess Engine that plays Cheapmate Chess. Author: Gary Baydo. Inventor: Robert Price.
- Sniper Chess. Frank Maus' game where most pieces move differently when capturing from how they move without capturing. Author: Ed Friedlander. Inventor: Frank Maus.
- Solitaire dice chess. Solitaire dice chess (concept works with variants & board games of skill too). (8x8, Cells: 64) By Kevin Pacey.
- Solitary Patience Chess. Variant Chess Magazine vol 7, issue 56. (8x8, Cells: 64) By Stephane Burkhart.
- Sonic the Hedgehog Chess. After capturing, the capturing piece bounces off the enemy piece and continues moving. (8x8, Cells: 64)
- Sonic the Hedgehog Chess Advanced version. Missing description (8x8, Cells: 64) By Daniil Frolov.
- Spacious Torus Chess. Toroidal 8 x 8 using "spacious" FIDE pieces which require the next square beyond to be empty to either move or capture. Author: Fergus Duniho. Inventor: Jianying Ji.
- Spacious Torus Chess . Chess on a toroidal board, using Ralph Betza's spacious pieces. By Jianying Ji.
- Spacious Torus Chess. Chess on a toroidal board, using Ralph Betza's spacious pieces. (8x8, Cells: 64) By Jianying Ji.
- Spell Chess. A limited supply of freeze and jump spells allow you to hinder the opponent or get extra moves. (8x8, Cells: 64) Author: H. G. Muller.
- Spherical chess. Sides of the board are considered to be connected to form a sphere. (8x8, Cells: 64) Author: Alessandro Castelli and Fergus Duniho. Inventor: Don Miller and Leo Nadvorney.
- Spherical Corner Chess. Game on a truly topologically spherical board with corner‐camp arrays. By Bn Em.
- Spiral Chess. The royal pieces slide along a spiral trajectory. By H. G. Muller.
- Squadron Chess. Uses only one type of piece besides the King. By Ken Franklin.
- SquireKnight. Squire Knight combines Knight and Forward/Backward Pawn like moves. (8x8, Cells: 64) By Stephane Burkhart.
- 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.
- Stalemate chess. Missing description (8x8, Cells: 64) By Daniil Frolov.
- Stallmate Chess. Both players win or both players loose. (8x8, Cells: 64) By punkus martyrus.
- Standoff Chess. A threat to capture the opponent's King does not give check if it opens one's own King to immediate recapture. (8x8, Cells: 64) By Robert Shimmin.
- Stationary King Chess . Kings can't move. Author: Uwe Wiedemann.
- Steward Chess. Kings are able to "crown" pieces, giving them extra moves. (8x8, Cells: 64) By Adrian Alvarez de la Campa.
- Sting . A game where Kings can move like Grasshoppers in addition to their normal move. Author: Uwe Wiedemann.
- Sting. A game where Kings can move like Grasshoppers in addition to their normal move. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- Strate-Go Chess. Missing description (8x8, Cells: 64) By John Kipling Lewis.
- Strategy for Losing Chess . Website with strategic tips for Giveaway chess.
- Strong Pawn Chess. Pawns move in a similar fashion to the pieces they start in front of. (8x8, Cells: 64) By Este.
- Stupid. A cross variant between Ultima and orthodox chess. (8x8, Cells: 64) Inventor: Paul Monckton.
- Stylish victory or stylish fail. Missing description (8x8, Cells: 64) By Daniil Frolov.
- Suction Chess. Pieces swap places instead of being removed from the board, resulting in very different strategy. By Nathaniel Virgo.
- Sudden Death Chess. If you do not capture, you must remove one of your own units. Author: Ed Friedlander. Inventor: Doug Chatham.
- Sudden Death Chess. A piece must be sacrificed after each non-capturing move. (8x8, Cells: 64) By Doug Chatham.
- Sudden Death Chess . A piece must be sacrificed after each non-capturing move. By Doug Chatham.
- Suffocation Chess. FIDE setup with new capture. (8x8, Cells: 64) By Tarun Moni.
- Suffocation Chess. FIDE setup with new capture. Author: Tony Quintanilla. Inventor: Tarun Moni.
- Suicide Chess. Taking is obligatory; the first player that loses all his pieces wins. (8x8, Cells: 64) (Recognized!) Author: Hans L. Bodlaender and Antoine Fourrière.
- Suicide Chess, Davis Variation. Win by checkmate or by loosing your pieces. (8x8, Cells: 64) By Michael D. Davis.
- Suicide Void Chess. Variant of Suicide Chess. A piece creating a void in the board is moved after each capture. (8x8, Cells: 64) By Robert Atkinson.
- Super Maharadscha. The Maharaja in Maharaja and the Sepoys is thought to be inferior: What if you added the camel move? Author: Jeremy Gabriel Good. Inventor: Namik Zade.
- Super-Chess. www.oteroideas.com. By Superuser .
- Superchess. Pieces can be put on top of rooks and moved with them. (8x8, Cells: 64) By John Montagna.
- SuperKing. Kings can move like queens, but not through check. (8x8, Cells: 64) Author: John Love-Jensen. Inventor: John Love-Jensen and Richard .
- Swap Chess. A move can consist of a series of pieces swapping places. (8x8, Cells: 64) By João Pedro Neto.
- 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.
- Swapmate Chess. Pieces have "mates" which they can swap places with. (8x8, Cells: 64) By Adrian Alvarez de la Campa.
- Swarm Chess. Each of your units must move each turn if possible. Author: Ed Friedlander. Inventor: Ralph Betza.
- Swedish Chess. Drop chess with regular pieces. Pieces dropped can relocate friendly pawns. By M Winther.
- Swedish Hopper Chess. Features the Swedish Hopper. By Abdul-Rahman Sibahi.
- Switch-Side Chain-Chess. Optionally swap sides with your opponent upon completing a "chain". (8x8, Cells: 64) By Azlan Iqbal.
- Switching Chess. In addition to normal moves, switch with an adjacent friendly piece. By Tony Quintanilla.
- Switching Chess. In addition to normal moves, switch with an adjacent friendly piece. By Tony Quintanilla.
- Switching Chess. In addition to normal moves, switch with an adjacent friendly piece. (8x8, Cells: 64) By Tony Quintanilla.
- Switching Realms Chess . All noncapturing moves must change the board subset a piece occupies. Author: Peter Aronson. Inventor: Jörg Knappen.
- Switching Realms Chess. All noncapturing moves must change the board subset a piece occupies. (8x8, Cells: 64) By Jörg Knappen.
- Synchronous Chess. Chess played with written simultaneous moves. By Ralf Hansmann.
- Synchronous Chess. The two sides truly move simultaneously. Author: Ed Friedlander.
- TaflChess. A mix of FIDE chess and the old European game Tafl. (8x8, Cells: 64) By Rich Hutnik.
- TaflChess for Zillions. TalfChess on Zillions site. By Rich Hutnik.
- Take and Return Chess. You put pieces taken from the opponent back on the board. (8x8, Cells: 64)
- Take Me Chess. Object is to lose your units and be unable to move. Author: Ed Friedlander.
- Take-all Chess. Taking is obligatory; the first player that loses all his pieces wins. (8x8, Cells: 64) (Recognized!) Author: Hans L. Bodlaender and Antoine Fourrière.
- Take-all Chess. Take all pieces of your opponent. (8x8, Cells: 64) Author: Andrea Mori.
- Takeover Chess Play-By-Mail game. Examine this game played in the Invent and Play contest! Drawn. Author: Peter Aronson and Tony Quintanilla. Inventor: Tony Quintanilla.
- Tandem-Pawn Chess. Pawns are tandems of two pawns, which can move or capture as a unit, or decouple into two pawns. (8x8, Cells: 64) By Kenneth Regan.
- Tank Chess. With exploding bombs and pushing tanks. Author: Ed Friedlander.
- Tank Chess. With exploding bombs and pushing tanks. (8x8, Cells: 64) Author: Andy Kurnia.
- Tank Chess . With exploding bombs and pushing tanks. Author: Robert Price.
- Tank Chess II. Queen's Rooks are Tanks, and can push lines of pieces. Author: Ed Friedlander. Inventor: Duncan Suttles.
- Tao's Chess. Chess variant where as you move across a line, the pieces reverse roles. By Travis Geyer.
- Tauschach. Each player has one piece off the board, that can be switched every turn with one of his pieces but not the king. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- 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.
- Tax Chess. King mobility affected by the placement of pawns of the same color. By Tomasz Sobczyk.
- Team-Mate Chess. Play this variant in which it takes a team to checkmate the King on Jocly. Author: H. G. Muller and Michel Gutierrez. Inventor: H. G. Muller.
- Team-Mate Chess. Variant with 8 different pieces, none of which is able to checkmate a bare king on its own. (8x8, Cells: 64) By H. G. Muller.
- Teamster Chess. Pawns pull the friendly piece behind them. Author: Ed Friedlander. Inventor: Tony Paletta.
- Teamster Chess . Pawns pull the friendly piece behind them. Author: Marek14 . Inventor: Tony Paletta.
- Teleport Chess. Each non-pawn, non-king piece may teleport once per game. (8x8, Cells: 64) Inventor: R. Wayne Schmittberger.
- Teleport Chess. Each piece (not king or pawn) may teleport once to any vacant square. Author: Ed Friedlander. Inventor: R. Wayne Schmittberger.
- Terrain Chess. Blocking pieces are placed randomly on the board. By Ronald Drinning.
- Terrain Chess. Roll dice to create impassable squares. (8x8, Cells: 64) By Ronald Drinning.
- 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.
- This Game is for the Birds. Game where pieces fly past obstacles and some pieces capture by pecking. (8x8, Cells: 64) Author: Ralph Betza and John Lawson. Inventor: Ralph Betza and Peter Aronson.
- 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.
- Threat Chess, Attackers Chess and Victims Chess. Missing description By Jeremy Gabriel Good.
- Threatened Pawn Chess. Pawns start in threatened positions. Author: Tony Quintanilla. Inventor: Sydney Schultz.
- Threatened Pawn Chess. Pawns start in threatened positions. (8x8, Cells: 64) Inventor: Sydney Schultz.
- Three Check Chess . If you deliver check for the third time, you win. Author: Andreas Kaufmann.
- Three Check Chess. If you deliver check for the third time, you win. Author: Ed Friedlander.
- Three Kinds of Billiards Chess. Pieces bounce off the edges of the board. (8x8, Cells: 64) By Ralph Betza.
- Three Player Chess. Three players must win both games simultaneously to win. (8x8, Cells: 64) By Andrew Heiser.
- Throne Chess. Same game as chess, except playing King to K8 wins too, by Thronemate. By Kevin Pacey.
- Throne Chess. Same game as chess, except playing K to K8 wins by Thronemate, too. By Kevin Pacey.
- Thunder Chess. Play this hybrid of Fusion, Assimilation, and Metamorph Chess. By Fergus Duniho.
- Thunder Chess. A hybrid of Metamorph Chess, Fusion Chess, and Assimilation Chess. (64x(8x8)) By Fergus Duniho.
- Tiled Squares Chess . Drop tiles to create the board as you play. By Tony Quintanilla.
- Tiled Squares Chess. Drop tiles to create the board as you play. (8x8, Cells: 64) By Tony Quintanilla.
- Tiled Squares Chess. Play this game, where you drop tiles to create the board as you play! By Tony Quintanilla.
- Time Travel Chess. Pieces can travel into the Future. Kings can also return to the Past! (8x8, Cells: 64) By Gary K. Gifford.
- Time Travel Chess. Play Time Travel Chess on the Game Courier! Author: Gary K. Gifford and Tony Quintanilla. Inventor: Gary K. Gifford.
- Time Traveler's Chess. Chess pieces may travel backwards in time. By Danny Purvis.
- Tingles, Bumps, and Punches. A set of variants on cylindrical and toroidal boards featuring a peace bump between the top and bottom of the board. (8x8, Cells: 64) By Ralph Betza.
- Tiraspol chess. Variant in which pieces capture as the piece whose starting file they're in. By Max K..
- TireBiter Chess. When taking, pieces can split and become a Tirebiter piece. (8x8, Cells: 64) By Ralph Betza.
- Toe to Toe Chess . A variant of Sittuyin (Burmese Chess) with alternating setup, and powerful, short-range pieces. By Peter Aronson.
- Toe-to-Toe Chess. A variant of Sittuyin (Burmese Chess) with alternating setup, and powerful, short-range pieces. (8x8, Cells: 64) By Peter Aronson.
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