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- 007 Chess. 007 Chess involves three move per turn, including one of your opponent's pieces. Author: Jeremy Gabriel Good. Inventor: Edward Jackman.
- 10 Minute Melee. Missing description Author: Nick Wolff. Inventor: Mason Green.
- 10-directional Chess. Updated with rule-enforcing presets. By Nick Wolff.
- 12 Sharp Chess. Missing description Author: Nick Wolff. Inventor: Charles Gilman.
- 123456 Chess. Missing description Author: Nick Wolff. Inventor: (zzo38) A. Black.
- 2 Queen Rocky Horror Lycanthropic Chess. Featuring pieces with Dissociative Identity Disorder. By Jeremy Gabriel Good.
- 21st Century Chess. Missing description Author: Nick Wolff.
- 3D Great Shatranj. a simple approach to 3D chess. By Joe Joyce.
- 4 Armies. Four traditional armies with cardinals face off on the corners. Author: Jeremy Gabriel Good. Inventor: Patrick Riley.
- 4 Kings Quasi-Shatranj. Each side has 4 Kings, all pieces are short range. By Kevin Pacey.
- 4 x 4 x 8 Tridimensional Chess. Clever 3-D variant, closer to Raumschach, but according to Gilman, solves some of Raumschach's design flaws. Author: Jeremy Gabriel Good. Inventor: Alberto Monteiro and Silvio Levy.
- 4*Chess (four dimensional chess). Four dimensional chess played with 96 pieces. By Kevin Pacey.
- 4D Hexagonal Chess. 4D analogue of Glinski's Hexagonal Chess based on Hyperchess4. By Kevin Pacey.
- 4D Quasi-Alice Chess. Four dimensional 8x8x2x2 game that's rather like Alice Chess. By Kevin Pacey.
- 65 Square Chess. FIDE chess but pretend there's another square smack dab in the middle. By Jeremy Gabriel Good.
- 6hess. Each piece moves 6 times before disappearing. By Adrian Alvarez de la Campa.
- A9 HexaChess Courier Preset. Missing description By Graeme C Neatham.
- Aberg's variation of Capablanca's Chess. Play this variation on the Play-by-Email system! Author: Fergus Duniho. Inventor: Hans Aberg.
- Accelerated Chess. White makes one move at first and then each player makes either a capturing move or two non-capturing moves. Author: Jeremy Gabriel Good. Inventor: Tony Paletta.
- Accessory Chess (with Divaricator). Drop chess with external piece. The Divaricator can capture by withdrawing in an oblique angle (+zrf). By M Winther.
- Achernar. ACHERNAR is a mix of the game ALTAIR and Western Chess. By Roberto Lavieri.
- Active King Chess. Each turn, one must move one's king in addition to moving other pieces. Author: Jeremy Gabriel Good. Inventor: Köksal Karakus.
- Actualized Potential Chess. Pieces exist where they are but also all along their routes or points of attack. By Jeremy Gabriel Good.
- Adjutant Chess. Regular chess with extended castling, and extra corner squares. Makes new strategies possible (+zrf). By M Winther.
- Adjutant Chess (with Adjutants). The Adjutant, besides sliding on the diagnals, can slide on the orthogonals by ignoring the other colour (+zrf). By M Winther.
- Advanced wizard chess. Missing description By Daniil Frolov.
- Agincourt. Decimal variant with Archers. Author: Tony Quintanilla. Inventor: Charles W. Stinson.
- AIGO Chess. Adds cannons to fianchetto positions of FIDE Chess. Author: Jeremy Gabriel Good. Inventor: Feng Jun.
- Air Attack Chess. Missing description By Stephen R. Stockman.
- Airplane Chess. R. W. Schmittberger's Airplane Chess on the Game Courier. Author: Abdul-Rahman Sibahi. Inventor: R. Wayne Schmittberger.
- Ajax Falcon Chess. Ajax Chess on a 10x8 board with two Ajax Falcon drops. By Jose Carrillo.
- Ajax Orthodox Chess. Orthodox Chess with Ajax-Chessmen, and droping Ajax-Ministers. By Jose Carrillo.
- Al-Ces. Variant on 10 by 10 board with 30 pieces per player. Author: Fergus Duniho. Inventor: Köksal Karakus.
- Alapo. A small chesslike game. Author: Ben M Reiniger. Inventor: Johannes Tranelis.
- Alekhine Chess. A 14 x 8 game expands the sides of Capablanca-esque board, adds two pairs of marshalls and cardinals and an amazon in the middle. Author: Jeremy Gabriel Good. Inventor: Michael Wortley Nolan.
- Alice Chess. Play this classic variant in which pieces switch between boards whenever they move. (Recognized!) Author: Fergus Duniho. Inventor: Vernon Rylands Parton.
- Aliens Vs Predators. Missing description By Namik Zade.
- All pieces of classic chesses. Missing description By Daniil Frolov.
- Alpaca Chess. An Alpaca, worth two pawns, is added to the standard piece context (with zrf). By M Winther.
- Altair. Altair is a modern game with an oriental flavor. Author: Antoine Fourrière and Roberto Lavieri. Inventor: Roberto Lavieri.
- Amalgamated Chess. Missing description By James Gryphon.
- Amazon Chess. Well known old variant with amazons instead of Queens in FIDE Chess. Author: Jeremy Gabriel Good.
- Amazon Grand Chess. A combination of Grand Chess and Amazon Chess. Author: Tony Quintanilla. Inventor: Namik Zade.
- Amazons. Queens fire arrows to make squares unpassable. Last player that moves wins. Author: Antoine Fourrière. Inventor: Walter Zamkauskas.
- Amoeba. Jim Aikin's Amoeba on the Game Courier. Author: Abdul-Rahman Sibahi. Inventor: Jim Aikin.
- Ancient world war. Play this game on Game Courier. By Daniil Frolov.
- Andernach. The capturing piece changes colors. Author: Jeremy Gabriel Good. Inventor: Stefanos Pantazis.
- Andy's Chess. Missing description By andrewthepawn.
- Anemic Chess. Rule-Enforcing Preset for Jaguaribe's short-range variant. Author: Nick Wolff. Inventor: Claudio Martins Jaguaribe.
- Anti-King Chess. Each player has both a King and an Anti-King to protect. Play it! Author: Tony Quintanilla. Inventor: Peter Aronson.
- Anti-King Chess II. Win by putting your opponent's Anti-King out of check. Author: Fergus Duniho and Tony Quintanilla. Inventor: Peter Aronson.
- Apothecary Chess-Classic. Large Board variant obtained trough tinkering with known games. By Aurelian Florea.
- Apothecary Chess-Modern. Large Board variant obtained trough tinkering with known games. By Aurelian Florea.
- Arabian Nights Chess. Paul Newton's game on the Game Courier. Author: Abdul-Rahman Sibahi. Inventor: Paul E. Newton and Timothy R. Newton.
- Arch Courier. Eric Greenwood's modernization of Courier and Courier Spiel Chess. Author: Jeremy Gabriel Good. Inventor: Eric V. Greenwood.
- Arch-Chancellor Chess. Uses Archbishops instead of Bishops and Chancellors instead of Knights. Author: Dominique Leste and Tony Quintanilla. Inventor: Dominique Leste.
- Archabbott Chess. Introduces the Archabbott piece which moves like Bishop + Wazir + Dabbaba. Author: Jeremy Gabriel Good. Inventor: Eric V. Greenwood.
- Archbishop Chess. Replace one of the marshalls from birds chess with a cardinal and you have Dominique Leste's Archbishop Chess. Author: Jeremy Gabriel Good. Inventor: Dominique Leste.
- Archchess. Late 17th chess variant from Italy on large board with pieces which include modern queen and squirrel. Author: Jeremy Gabriel Good. Inventor: Dr. Francesco Piacenza.
- Arrangement Chess. Swap king & queen before play begins. With mirrored kings and non-mirrored queens (with zrf). By M Winther.
- Assimilation Chess. Play this variant in which pieces assimilate the powers of captured pieces. By Fergus Duniho.
- Asteryx Chess. Preset for variant with asteryx shaped 43-space hexagonal board. Author: Fergus Duniho. Inventor: David Jagger.
- Asylum Chess. Fire-through rooks, mad leaping (camel-move) bishops and double-capture insane ninja knights with lion-like powers. By Charles Daniel.
- Asylum Redux. Featuring dual path Zebra / Camel crooked sliders compounded with Bishop / Rook. By Charles Daniel.
- Atlantean Barroom Shatranj. The most ambitious in a series of new games Joe Joyce is introducing with powerful short range compound double jumpers. By Joe Joyce.
- Atlantean Coffee House Shatranj. Grand Shatranj on a Hex board. By Graeme C Neatham.
- Avalanche Chess. A popular chess variant, where you advance your opponents pawns. (Recognized!) Author: Antoine Fourrière. Inventor: Ralph Betza.
- AVP Episode 2. Very creative and fun contemporaneous take on Maharaja Chess. By Namik Zade.
- Azchess. Variant of Grand Chess in which one amazon is added to each side. By Namik Zade.
- Azerbaijan Chess. http://zillions-of-games.com/cgi-bin/zilligames/submissions.cgi/73747?do=show;id=1659. By Namik Zade.
- Bachelor Chess. Play this game from the 42-square contest with the PBM system! By Doug Chatham.
- Bachelor Kamil. Play by E-mail! Combines ideas from Bachelor Chess and Wildebeest Chess. Author: Tony Quintanilla and Charles Gilman. Inventor: Charles Gilman.
- Backlash. Play on two boards, but capturing on one board leads to a backlash on the other! By Greg Strong.
- Balbo's Chess. Board with a strange shape designed to make Bishops stronger in relation to Rooks. Author: Gary K. Gifford. Inventor: M G Balbo.
- Balbo's Chess 2. Balbos Chess 2. Author: wdtr2. Inventor: M G Balbo.
- Bank Chess. Regular Chess only Drops come from Pocketings. Author: Jeremy Gabriel Good. Inventor: Karl Scherer.
- Banner Xiangqi. Xiangqi with Banners (from the Game of Three Kingdoms) and simplified endgame rules. By A. M. DeWitt.
- Barbershop Quartet. Toroidal Variant with Dual Direction Bishops. By Jeremy Gabriel Good.
- Bario. Pieces are undefined until they move. Author: Tony Quintanilla and Gary K. Gifford. Inventor: Panos Louridas.
- Battery Chess. Battery Chess on the Game Courier. By Abdul-Rahman Sibahi.
- Battle Line. A military-style variant with 48 pieces per side. By Joe Joyce.
- Battle Room Chess. Win by getting four of your pieces in or around your enemy's gate. By John Smith.
- Bear Chess. Play Bear Chess, a popular Russian game, on Game Courier.
- Bedlam. Play this hybrid of Fusion Chess, Metamorph Chess, and Chessgi. By Fergus Duniho.
- Bellows Chess. The board expands and contracts from turn to turn. By Tony Quintanilla.
- Berolina Chess. Classic variant with different moving pawns. Author: Fergus Duniho.
- Besiege Chess. Each side has two sets of armies, the black ones are in the middle and whites on top and bottom. Author: Jeremy Gabriel Good. Inventor: Köksal Karakus.
- Betza's Flying Circus. 4 Levels but only four pieces of two kinds can move on three of the levels. Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- Bifocal Chess. A game without capture : win by checkmate with a neutral piece! By Antoine Fourrière.
- Bifold Halfgi. Bifold pieces are able to combine with other same-colored bifold pieces and move as a single normal sized piece. By David Howe.
- Big Board Chess. Play Big Board Chess online with Game Courier. Author: Fergus Duniho. Inventor: Alfred Schönfelder.
- Big Chess. Ordinary chess pieces on an elongated 8 x 14 board with three times as many bishops and two times as many knights. Author: Jeremy Gabriel Good. Inventor: Sergey Sirotkin.
- Bigorra. Game Courier Preset for Bigorra, a large CV, 80 pieces of 34 types on 16x16 sq. board. (16x16, Cells: 256) By Jean-Louis Cazaux.
- Bird's Chess. Predecessor to Capablanca's Chess with Guard and Equerry. By Nick Wolff.
- Birds and Ninjas. Immaculately balanced game features pieces with unique fly-over capture ability and short-range diagonal leapers. By Charles Daniel.
- Bishop Knight Morph Factor. Missing description Author: Jeremy Gabriel Good. Inventor: Gary K. Gifford.
- The Black Ghost. Betzan attempt to remedy White's first move advantage in FIDE by giving Black a noncapturing but capturable teleporting piece. Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- Black Hole Chess. Game with missing center and two extra spaces just behind the kings. Author: Jeremy Gabriel Good. Inventor: David Short.
- Blackjack Chess. Reduce the point value of your pieces to exactly 21 points and win the game. Or do it the old-fashioned way. Author: Jeremy Gabriel Good and Adrian Alvarez de la Campa. Inventor: Henk Breugem.
- Bland Chess. Chess, but with no diagonal movements (aside from that built within the Knight). Author: Gary K. Gifford.
- Bland Chess 46. A 46 square variant of Bland Chess. Allows for War Machine, Knight, and/or Modern War Machine use. Author: Gary K. Gifford. Inventor: Gary K. Gifford and (zzo38) A. Black.
- Blue Chess or Deep Blue Vs. Kasparov Chess. Tribute to a famous game with three shades of blue and different options for each player to achieve a win. Author: Jeremy Gabriel Good.
- Blue Chip Chess. Fun variant where each turn you get to create an off-limits square for your opponent . Author: Jeremy Gabriel Good. Inventor: Neal Turner.
- Bomberman Chess. Two "bombs" and a "defuser" spice up this 10 x 8 game. Author: Jeremy Gabriel Good.
- BordahBee. A two-move, two-board game with restrictions for the second move according to the first move. By Gary K. Gifford.
- BrainKing.com. Play by email site that lets you play several chess variants. By Filip Rachunek.
- Brand X Random Chess. Play Chess with a randomized setup. By Fergus Duniho.
- Brigadier Chess. Introducing the powerful Brigadier piece on a 68-square Gustavian board. By M Winther.
- Brotherhood Chess. A piece cannot capture one of its own kind. Author: Antoine Fourrière. Inventor: Gianluca Vecchi.
- Brouhaha. Preset for Brouhaha, a game that brings the ruckus! By Greg Strong.
- Building chess. Add a square after every move. Author: Abdul-Rahman Sibahi. Inventor: Abdul-Rahman Sibahi and Sergey Sirotkin.
- Burmese Chess. Sittuyin preset uses a mix of equivalent pieces from Alfaerie Set. By Charles Daniel.
- Butterfly Chess. Game with Butterflies (not Ns), Advancers (not Qs) & Flying Dragons added. By Kevin Pacey.
- Byelorussian Chesskers. Pieces promote to "Damkas" in this Chess Checkers Hybrid. Author: Jeremy Gabriel Good. Inventor: Uwe Wiedemann and N. N. Grushevsky.
- Cagliostro's Chess. Savio Cagliostro of Okeechobee Florida invented this variant in latter quarter of 20th c. Adds extra cardinal and amazon to capa. Author: Jeremy Gabriel Good. Inventor: Savio Cagliostro.
- Caïssa Britannia. Play this British-themed game with royal Queens plus Lions, Unicorns, and Dragons. By Fergus Duniho.
- Camel and Rhino Chess. Variant on 10 by 10 board with new pieces. By Tony Quintanilla.
- Camel Decimal Chess. Game Courier preset for Camel Decimal Chess, a 10x10 chess with Camels. (10x10, Cells: 100) By Jean-Louis Cazaux.
- Camelrider Chess. P. Aronson's big-board variant with regular pieces and Camelriders. Author: M Winther. Inventor: Peter Aronson.
- Cannon Shosu Shogi. Variant of Shosu Shogi with Dogs and Cannons. By A. M. DeWitt.
- Cannonrider Chess. The Cannonrider moves differently depending on square colour: on white squares as a Nightrider; else as a Chinese Cannon. By M Winther.
- Cannons and Crabs. Small board, cannons (alibaba-guards) and some centralized crabs (sergeant pawns) - promotion only to cardinal or marshall... Author: Jeremy Gabriel Good. Inventor: David Short.
- Cannons of Chesstonia. Cannons on the sides of the board can "fire" new pieces into the game. Author: Jeremy Gabriel Good. Inventor: Gary K. Gifford.
- Canonness Chess. Chess with Cannons and Canonesses (Vaos) on a differently shaped board. By Adrian Alvarez de la Campa.
- Canyon Chess. Play this small variant with Marshalls and Archbishops and some new rules! Author: Tony Quintanilla. Inventor: Andrew Blechinger and Jarry Vega.
- Capablanca Random Chess. Randomized setup for Capablanca chess. Author: Fergus Duniho. Inventor: Reinhard Scharnagl.
- Capablanca Shatranj. Where Cardinal and Marshall are replaced by their moderate short range leaper counterparts. Author: Jeremy Gabriel Good. Inventor: Christine Bagley-Jones.
- Capablanca's Chess. Play Capablanca's Chess on the Play-by-Mail system! Author: Fergus Duniho. Inventor: Jose Raul Capablanca.
- Cardinal Chess. Just like the usual Western contemporary, only replacing Mad Queen with Bishop Knight compound. Author: Jeremy Gabriel Good. Inventor: Vitya Makov.
- Carnage. Combines Rococo type gameplay with Chess on a large board with augmented knights and ninja pawn drops. By Charles Daniel.
- Carrousel Chess. Circular chess using reflecting bishops & squirrels, not Bs & Ns. By Kevin Pacey.
- Castle Chess. As Fide-chess, but with extended castle: the king may jump three squares (with zrf). By M Winther.
- Cataclysm. Large board variant with exciting, strategical play, and many powerful short-range pieces. By Greg Strong.
- Catapults of Troy. Large variant with a river, catapults, archers, and trojan horses! Author: Gary K. Gifford and Tony Quintanilla. Inventor: Gary K. Gifford.
- Cavalier Chess. All pieces except queens have some kind of knight-movement. By Fergus Duniho.
- Cavalry Chess. All pieces have additional knight move except knights which get camel + zebra moves. Author: Jeremy Gabriel Good. Inventor: Frank Maus.
- CCC - The Clash of Civilizations Chess. ...two Chess Armies made from (some of) the most popular pieces used in Western and Eastern Chess games. By Namik Zade.
- CCChess - shuffle version. A few different imaginings of CCChess. By Namik Zade.
- CCCHess,Demon Vs Super Symchess. Pieces from Demon Chess face off against those from Super Symchess. By Namik Zade.
- CDA Variant: Fighting Fizzies. Missing description Author: Jeremy Gabriel Good. Inventor: Peter Aronson.
- CDA: Demi-Rifle Army. Missing description Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- CDA: Meticulous Mashers. ...every piece very nearly matches the corresponding piece from FIDE-chess, both in value and in general characteristics. - RB. Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- CDA: Pizza Kings. Experimental CDA army, submitted half in jest, with pieces whose movement imitates their shape. Author: Jeremy Gabriel Good. Inventor: John Lawson.
- CDA: Spacious Cannoneers. Spacious pieces combine with Vao and Pao pieces for Betzan Chess with Different Armies Variant. Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- Cellular Chess. Play Cellular Chess at Game Courier. By Carlos Cetina.
- Centaur Chess. All pieces except Pawns move backwards as a Knight. By Adrian Alvarez de la Campa.
- Centennial Chess. 10x10 Variant that adds Camels, Stewards, Rotating Spearmen and Murray Lions to the standard mix. Author: David Howe. Inventor: John William Brown.
- Center of Attention. FIDE Chess but with an additional winning condition: Move your king unchecked into a center square. Author: Jeremy Gabriel Good. Inventor: Johan Richter.
- Cetina Random Chess. Missing description By Carlos Cetina.
- Cetran Chess 2. Missing description By Carlos Cetina.
- CGNP chess. A game with Knightly Pawns. By Abdul-Rahman Sibahi.
- Champagne Chess. Chess on a 12x8 board with ferfils and dragons added. By Kevin Pacey.
- Chasm Chess. Berolina Pawns, reflecting Bishop and Queen, and a chasm in the board! Author: Tony Quintanilla. Inventor: Danielle Allen.
- Chaturanga. Oldest known form of chess. (Recognized!) Author: Fergus Duniho.
- Checkers. The most popular game besides Chess played on the same board. Author: Fergus Duniho.
- Chesimals I. This game introduces "Chess Animals", independent groups of chess pieces that act as one large multi-square piece. By Joe Joyce.
- Cheskers. Fun and simple crossover between chess and checkers invented by professor Solomon W. Golomb. Author: Jeremy Gabriel Good. Inventor: Solomon W. Golomb.
- Chess. Play Chess online with other people, using Game Courier, a PBM system that works with any web browser on any computer. Author: Fergus Duniho.
- Chess 1010. Game with 40 pieces. By Kevin Pacey.
- Chess 25 (Fischer Placement Chess). Swap king and/or queen before play begins. Follows FRC rules (with zrf). By M Winther.
- Chess 68. FIDE Chess with setup inspired by Omega Chess, to allow two modest new corner pieces. Author: Jeremy Gabriel Good.
- Chess 9x9. Exciting variant combining classical pieces with Amazons, Camels and Dragon Horses. By Carlos Cetina.
- Chess on a 12 by 12 board. Doug Vogel has placed the standard 32 chess pieces in the center of a 12x12 board. Author: David Paulowich. Inventor: Doug Vogel.
- Chess on a Larger Board with not so few Pieces Dropped Preset. Play this game with an interesting mix of Orthochess and Exotic pieces, some of which start in-hand! By Antoine Fourrière.
- Chess on a Longer Board with a few Pieces Added. Play this 8x10 game with three new pieces. Author: Antoine Fourrière. Inventor: David Howe.
- Chess on a Really Big Board. Play Ralph Betza's Huge Chess Variant with Game Courier.
- Chess on a Really Big Board. Game that introduced rose and knight-camel-zebra... Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- Chess on the Dot. Play this adaptation of Chess to a spherical board on Game Courier. Author: Fergus Duniho. Inventor: Joshua Chou.
- Chess on the Rainbows. Six different colors light up the board. You have to keep a piece on each color throughout... Author: Jeremy Gabriel Good.
- Chess on Two Boards. Chess on Two Boards. By Joe Joyce.
- Chess vs checkers. Missing description By Daniil Frolov.
- Chess with Different Armies. A Ralph Betza personal favorite: Features series of armies with approximately the same strength as the FIDE army. (Recognized!) Author: David Howe and Fergus Duniho. Inventor: Ralph Betza.
- Chess with Different Armies: Cylindrical Cinders. Ralph Betza variant, in which the White Pieces have the advantage of treating the board cylindrically. Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- Chess with Extended Castle. Standard chess with extended castle rule, effectuating greater opening variance (with zrf). By M Winther.
- Chess with Extra Bishops. FIDE Chess with Extra Pair of Bishops that Start from Same Square. By Jeremy Gabriel Good.
- Chess with Promoters. Each player has a piece which may promote the pieces of his opponent. Author: Antoine Fourrière. Inventor: Roberto Lavieri.
- Chess with Terrain. Play Greg Strong's Chess with Terrain on Game Courier. By Greg Strong.
- Chess With Wizards. Chess with Wizards on the Game Courier. By Abdul-Rahman Sibahi.
- Chess100. Piece positions are modestly randomized according to Arrangement Chess rules, castling is retained (+ zrf). By M Winther.
- Chess256. The pawns are randomized on the 2nd and 3rd rank. By M Winther.
- Chess400. Piece setup is randomized according to Configuration Chess rules, producing 400 modest, mostly non-mirrored, positions (+ zrf). By M Winther.
- Chess484. Before play, certain pieces are regrouped, creating natural positions. Castling is retained (+ zrf). By M Winther.
- Chess64. The piece array is moderately randomized according to Relocation Chess rules, castling is retained. By M Winther.
- Chessence of Jim Winslow. Movement is dictated by relation to friendly pieces. Author: Jeremy Gabriel Good. Inventor: Jim Winslow.
- Chessgi. Play this hybrid of Chess and Shogi. Author: Fergus Duniho.
- Chieftain Chess. Large variant using 4 royal pieces with command control, multi-piece moves and pieces that may shift direction as they move. Author: Jeremy Gabriel Good. Inventor: Joe Joyce.
- Chigorin Chess. Knights and Chancellor vs. Bishops and Queen. Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- Chinese Chess. Play Xiang Qi, the Chinese form of Chess. Author: Fergus Duniho.
- Chinese court. Missing description By Daniil Frolov.
- Chogo-44. Game with pawns and kings with co-enclosure capture. Author: Jeff Rients. Inventor: David Jagger.
- Chu Seireigi. Variant of Chu Shogi playable with drops. (12x12, Cells: 144) By A. M. DeWitt.
- Chu Shogi. Historic Japanese favorite, featuring a multi-capturing Lion. Author: A. M. DeWitt.
- Circular Capa Chess. Play circular chess with added archbishops and chancellors on a 5x16 round board. By Kevin Pacey.
- Circular Chess. PBM Preset for Circular Chess. Author: Fergus Duniho. Inventor: Dave Reynolds.
- Cleopatra Chess. Dan Troyka game, similar to Benedict Chess but with only one color-changing piece. Cleopatra "seduces" any piece she sees. Author: Jeremy Gabriel Good. Inventor: Dan Troyka.
- Clockwork Orange Chess. Condition your opponent's pieces to be non-violent. By Fergus Duniho.
- Cobra Chess. Link featuring piece that occupies four squares at once, the cobra, moves like a rook but can leap over friendly pieces. Author: Jeremy Gabriel Good. Inventor: Derick Peterson.
- Coherent Chess. Coherent Chess on the Game Courier. Author: Abdul-Rahman Sibahi. Inventor: Carlos Cetina.
- Coherent Chess (updated). http://www.chessvariants.org/large.dir/coherent.html. By Carlos Cetina.
- Colossus. 10x10 chess with 4 Rooks, 4 Knights, 4 Bishops, 10 Pawns, 1 Queen and 1 King! Author: Charles Daniel and Fergus Duniho. Inventor: Charles Daniel.
- Commodore Chess. Featuring the Commodore piece (also called Leo) on a Gustavian board. By M Winther.
- Complete Permutation Chess. Carrera pieces given additional falcon movement ability are added to wide 8 row board. Author: Jeremy Gabriel Good. Inventor: George William Duke and Peter Aronson.
- Compound Chess. Chess on a 10x8 board with Sergeant pawns & armies of compound pieces. (10x8, Cells: 80) By Kevin Pacey.
- Compton Medieval Chess. Large variant with three new pieces. By Travis Compton.
- Configuration Chess. King and queen swap with other pieces before play begins - enormous variety! (with zrf). By M Winther.
- Congo. Demian Freeling's Congo on the Game Courier. Author: Abdul-Rahman Sibahi. Inventor: Demian Freeling.
- Connected Chess. Pieces are removed when they are no longer adjacent to any other piece. By Dan Troyka.
- Contemporary Random Chess. Missing description By Jose Carrillo.
- Contramatic Chess. This king can walk right into check! The goal for this king is to get checkmated. Author: Jeremy Gabriel Good. Inventor: Vernon Rylands Parton.
- Corral Chess.. Force the opponent to the center in this 45/46 Cell Contest entry. By Doug Chatham.
- Corridor Chess. FIDE but subtracting rook pawns and setting pieces up in house in middle. Author: Jeremy Gabriel Good. Inventor: Tony Paletta.
- Courier Chess. A large historic variant from Medieval Europe. Author: Fergus Duniho.
- Courier Chess - Modified. Fourth and Fifth Courier Chess variant modifications.... Author: Jeremy Gabriel Good. Inventor: Eric V. Greenwood.
- Courier de los Combinados. Variant with the most Basic Combinations of Knight, Camel, FIDE pieces, with ferzes, wazirs and guards. Author: Jeremy Gabriel Good. Inventor: Charles Gilman.
- Courier-Spiel. More modern version of Courier Chess, with Queen added. Author: Jeremy Gabriel Good.
- Crab Chess (Chess4). Blocked flank pawns are have an additional jump move to empty square (with zrf). By M Winther.
- Crazy 38's. Ben Good's Crazy 38's on the Game Courier. Author: Abdul-Rahman Sibahi. Inventor: Ben Good.
- Crazyhouse. Play this two-player version of Bughouse. (Recognized!) Author: Fergus Duniho.
- Critters: Chesimals III. Chesimals redesigned. By Joe Joyce.
- Crooked Chess. Chess variant with pieces inspired by the Sissa piece. By Jeremy Gabriel Good.
- Cube Shogi. Shogi with cube-shaped pieces. By John Smith.
- Culverin Chess. The Culverin is a cannon that can move like a king but must jump to capture (+zrf). By M Winther.
- Cylindrical Chess. Sides of the board are supposed to be connected. Author: Antoine Fourrière and Fergus Duniho.
- D B Extreme ! (Doppelganger BordahBee Extreme). Doppelganger BordahBee Combo with Very High Capturing Potential. By Gary K. Gifford.
- Dada. The colorbound chess variant. By Abdul-Rahman Sibahi.
- Dai Seireigi. Variant of Dai Shogi playable with drops. (15x15, Cells: 225) By A. M. DeWitt.
- Dead Ringers Chess. Double chess game with twin pieces that are captured simultaneously. By Adrian Alvarez de la Campa.
- Decima. Variant on 10 by 10 board where you win when you have 10 points on the 10th row. Author: Antoine Fourrière. Inventor: Michael Nelson.
- Delegating Chess. 84 square variant in which pieces delegate moving powers. Author: Fergus Duniho. Inventor: João Pedro Neto.
- Delta88 Chess. trigonal chess using an hexagonal-lattice board. By Graeme C Neatham.
- Deluxe Chess. http://hometown.aol.com/taurusgaming/index.html. By Stephen R. Stockman.
- Demi Chess. Weak short range pieces with less symmetry than some more familliar pieces. Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- The Demon Game. Larry Smith 10 x 10 game with extra Capablanca pieces. Author: Jeremy Gabriel Good. Inventor: Larry L. Smith.
- The Demon Game. 10 x 10 game with extra Capablanca pieces. Author: Nick Wolff. Inventor: Larry L. Smith.
- Deneb. Now you can play Deneb on the Play-By-Mail system! Author: Roberto Lavieri and Tony Quintanilla. Inventor: Roberto Lavieri.
- Deneb Play-By-Mail game. Observe this game being played in the Invent and Play contest! Turn 4. Author: Roberto Lavieri and Tony Quintanilla. Inventor: Roberto Lavieri.
- Dervish Chess. Large variant with a great variety of pieces. Author: Tony Quintanilla. Inventor: Benoit Dauphin.
- Descent Chess. Kaufmann's drop variant. Begins with only K + P + P. Recommendable! Author: M Winther. Inventor: Andreas Kaufmann.
- Desert Pub Chess. A game with Desert Ferz and Desert Wazirs which make muliple captures by jumping. By Gary K. Gifford.
- Devingt Chess. Game Courier to play Devingt Chess, on a 10x10 board with Sages (=Camels). Author: Fergus Duniho. Inventor: Leopold de Labrousse.
- Diamond Chess. Chess on a Diamond board. By Abdul-Rahman Sibahi.
- Dice Mate Chess. No capture; checkmate only happens if roll of the dice is favorable. By George William Duke.
- Diffusion Chess. Creative attempt by Alexander Munoz to combine Chess and Go. Author: Jeremy Gabriel Good. Inventor: Alexandre Muñiz.
- Dimachaer Chess. The Dimachaer is a gladiator bifurcation piece that must collide to move (+zrf). By M Winther.
- Dimension X. Unusual transdimensional pieces interact with FIDE Chess. Author: Jeremy Gabriel Good. Inventor: Gary K. Gifford.
- Directed Alice Chess III. 3-board Alice. By Joe Joyce.
- Disintegration Chess. Pre-set for the game of disintegrating kings, rooks, fye'tins, and pawns. By Gary K. Gifford.
- Displacement Chess 2. Chess with flexible castling, reverse symmetry and no opening theory. By Charles Daniel.
- DoGod Random. Pawns and pieces dispersed on first and second ranks. Author: Jeremy Gabriel Good. Inventor: Calvin Jack Pomerantz.
- Doppelganger BordahBee. A combination of BordahBee and Doppelganger Chess. By Gary K. Gifford.
- Doppelganger Chess. Pieces have their "doubles" (Doppelgangers). Capture an opponent's piece to make both disappear... uses a FIDE chess set. By Gary K. Gifford.
- Double Chess. FIDE Chess x 2(with extra queen replacing what would be an extra king). Author: Fergus Duniho and Antoine Fourrière. Inventor: David Short.
- Double Diamond. Pieces start diagonally across from one another and pawns move diagonally. Author: Jeremy Gabriel Good. Inventor: Jim Aikin.
- Double EIGHTEEN-STONE chess. David Short combines his Double Chess with Jim Aikin's Eight-Stone Chess. Author: Jeremy Gabriel Good. Inventor: David Short.
- Double Move Double Chess. Play this double move variant that uses two Chess sets with Game Courier. (8x16, Cells: 128) Author: Fergus Duniho. Inventor: Вадря Покштя.
- Dr. Who Chess. Variant based on the popular TV seiries. By Calvin Jack Pomerantz.
- Dragonet Chess. The Dragonet flies to any square queenwise, captures piece behind landing square (with zrf). By M Winther.
- Dragonfly. Christian Freeling's 7x7 Chessgi type variant. No Queens. Pawns don't drop. Author: Gary K. Gifford. Inventor: Christian Freeling.
- Dromedary Chess. Pieces adjacent to the King can leap like a Dromedary (Camel). By M Winther.
- Dual Chess. A more Chess-like variant featuring the Marshall and the Cardinal. By Antoine Fourrière.
- Duel Chess. PBM Preset for 43-space variant played on two boards. Author: Fergus Duniho. Inventor: Erez Schatz.
- Dueling Archbishops. Chess game with only six cells but with a piece that morphs into four different forms. Author: Jeremy Gabriel Good. Inventor: Jason D. Wittman.
- The Duke of Rutland's Chess. Missing description Author: Jeremy Gabriel Good. Inventor: John Third Duke of Rutland.
- Dynamo Chess. Preset for Dynamo Chess. Author: Adrian Alvarez de la Campa. Inventor: Hans Kluever.
- Each Piece Once Chess. Each turn, move as many as all your pieces, but only once! By Jeremy Gabriel Good.
- Ecumenical Chess. Ecumenical Chess features three variants with camel-bishop, camel-rook knight-camel compounds. Author: Jeremy Gabriel Good. Inventor: Charles Gilman.
- Eight-Stone Chess. Players can move neutral stones as well as pieces. Author: Jeremy Gabriel Good. Inventor: Jim Aikin.
- Elephant Chess. Featuring the time-honoured Burmese Elephant. By M Winther.
- Elephant Hunt. Ituri Forest Pygmi traditional game with chess-like elements. Author: Tony Quintanilla. Inventor: Freederick .
- Elite Chess. Elite Chess adds an Amazon to Capablanca's Game by adding one more row to the board. By Stephen R. Stockman.
- Elk Chess. The double-barrelled Elk moves differently depending on square colour. By M Winther.
- Elk Chess (with Scorpions). Poisonous Scorpion pawns combined with the restive Elk, that changes with the colour of the square. By M Winther.
- Elkrider Chess. Elkrider plus regular pieces. The Elkrider moves like a Nightrider if standing on white squares, otherwise it moves like a Rook. By M Winther.
- Elven Chess. Chu Shogi Lion, Dragon Horse, Dragon King, Guard on Grand Chess type setup. Author: Jeremy Gabriel Good. Inventor: H. G. Muller.
- Embassy Chess. Play this modern Bird's Chess variant based on the setup of Grand Chess. Author: Fergus Duniho. Inventor: Kevin Hill.
- En Passant Chess. All pieces have the en passant option. Koksal Karakus version. Author: Jeremy Gabriel Good. Inventor: Köksal Karakus.
- En Passant Chess of Ingo Althofer. This is just FIDE Chess, but with board contracted by one row. Try it out. Author: Jeremy Gabriel Good.
- Energizer Chess. Chess on a normal board with an Archbishop and a Chancellor added. By Abdul-Rahman Sibahi.
- English Random Chess. Play this game with standard chessmen on a 10x10 board, with randomized piece setup. Author: Tony Quintanilla. Inventor: Benjamin Clarke.
- Enhanced Courier Chess. Courier Chess with the weaker pieces enhanced. By Daniel Zacharias.
- Episcopal Chess. Play this symmetric version of Chess online. By Fergus Duniho.
- Eric's Great Chess. Eric Greenwood shortens by two rows the familiar ancient Great Chess board. Author: Jeremy Gabriel Good.
- Essedar Chess. The Essedar is a bifurcation piece that moves by colliding (+zrf). By M Winther.
- Euchess. Missing description By Carlos Cetina.
- Eurasian Chess. Synthesis of European and Asian forms of Chess. By Fergus Duniho.
- ExCoCo Chess. Missing description By Graeme C Neatham.
- Exinox Chess. Missing description By Carlos Cetina.
- Existentialist Chess. Play this game on a 10x10 board with many different pieces. Author: Tony Quintanilla and David Short. Inventor: David Short.
- Expanded Chess. 100 square chess with complementary pieces. By Daniel Zacharias.
- Extinction Chess. Win by capturing every piece of the same type. (Recognized!) Author: Fergus Duniho and Antoine Fourrière. Inventor: R. Wayne Schmittberger.
- Extra Move Chess. Move twice per turn with Extra Move Chess. By Fergus Duniho.
- Extrapawn Chess. Standard chess with one extra pawn per player in the reserve (with zrf). By M Winther.
- Fabulous Flying Kittens. Toroidally interwoven board using same number of squares and pieces as FIDE Chess. By Jeremy Gabriel Good.
- Falcon Chess. Play Falcon Chess on Game Courier! Author: George William Duke and Tony Quintanilla. Inventor: George William Duke.
- Falcon Chess 100. Falcon Chess 100 is a variant of Falcon Chess played on a larger board with some different rules for the Pawns. Author: Jeremy Gabriel Good. Inventor: George William Duke.
- Falcon Chess RFNB. Falcon Chess with a new setup. By Abdul-Rahman Sibahi.
- Falcon Chess RNFB. Falcon Chess with the formation Rook, Knight, Falcon, Bishop. Author: Jeremy Gabriel Good. Inventor: George William Duke.
- Falcon Chess Variants - Several. Some Different Setups with Falcon pieces, including with Capablanca pieces and Airplanes. Author: Jeremy Gabriel Good. Inventor: Abdul-Rahman Sibahi and Peter Aronson.
- Falcon Chess: Passed Pawns, Scorpion and Dragon. Various passed pawns variants, and variants introducing scorpion and dragon. Author: Jeremy Gabriel Good. Inventor: George William Duke.
- Falcon Hexagonal Chess. The Hex Falcon on the Game Courier. By Abdul-Rahman Sibahi.
- Falcon King Chess. A shortrange variant on an 8x8 board featuring a pair of royal Falcons. By Joe Joyce.
- Fantastic XIII. This is the G.C. preset for Fantastic XIII, a bizarre CV,13 types of pieces on 13x13 board. By Jean-Louis Cazaux.
- FIDE Chess Kamil. FIDE Chess but with extra pawns, extra bishops and a store of superpowerful pieces waiting to replace the regular ones. By Jeremy Gabriel Good.
- FIDE Chess with Extra Pieces. FIDE Chess but with substitute pieces. By Jeremy Gabriel Good.
- FIDE Frolic. FIDE chess, but with each piece able to leap. By Jeremy Gabriel Good.
- Fifo Chess. Multiple Occupier game where rule is that first one there is first one to be captured and to leave. "First In, First Out". Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- Fighting Kings. Fighting Kings cannot be checked or checkmated; but a Royal Pawn can. By Gary K. Gifford.
- Fighting Kings and Throne Kings. Chess with a normal Fide King and a Fighting King immune from check and checkmate. A sister game to Fighting Kings. By Gary K. Gifford.
- Final Fight CCChess. Last word in CCChess. By Namik Zade.
- Fischer Random Chess. Play Bobby Fischer's randomized Chess variant on Game Courier. (Recognized!) Author: Fergus Duniho. Inventor: Robert J. Fischer.
- Flexible Chess (F-chess). The light pieces are external and can move from any empty first rank square (with zrf). By M Winther.
- Fluid Chess. Pieces can move into (or through or out of and into again) friendly pieces ("into" up to compounds). Author: Jeremy Gabriel Good. Inventor: Joe Joyce.
- Flying Bombers Chess. This dual-range flying and jumping piece adds a new dimension to chess. Standard and large board presets. By Charles Daniel.
- FOOD FIGHT. Game Courier preset for FOOD FIGHT!!! (12x12, Cells: 144) By Bob Greenwade.
- Fool's Hexagonal Chess Courier Preset. Missing description By Graeme C Neatham.
- Football Chess. Pieces interact with a ball and each side tries to get the ball into the opposing goal. Author: Jeremy Gabriel Good. Inventor: Joseph Boyer.
- Four-Way Chess. 4-Way Chess. By Stephen R. Stockman.
- Frog Chess. Play chess with added frogs (ferz-threeleaper compound) on 10x8 board. By Kevin Pacey.
- Fugue. Based on Ultima and Rococo this game has pieces that capture in unusual ways. Author: Antoine Fourrière. Inventor: Michael Nelson.
- Full house hexagonal chess. Hexagonal game with 50 pieces. By Kevin Pacey.
- Fusion Chess. Play this variant in which pieces combine and split apart. By Fergus Duniho.
- Fusion Diamond 41. A Fusion Chess variant played on a diamond shaped board of 41 squares. By Fergus Duniho.
- Futashikana Shogi. Expanded version of Shosu Shogi played on an 11x11 board. By A. M. DeWitt.
- Gala. Historical German variant from the Middle Ages. Author: Tony Quintanilla.
- Game Courier. PHP script for playing Chess variants online. By Fergus Duniho.
- Gamma2 Chess. Chess on a 10x8 board with Berolina Pawns & special Ship & Archer pieces. (10x8, Cells: 80) By Kevin Pacey.
- Ganymede Chess. Mark Hedden's idea for "a large chess variant with many weird pieces...which wouldn't seem too different from orthodox chess". Author: Jeremy Gabriel Good. Inventor: Mark Hedden.
- Gast's Chess. Large 1969 variant using the Cardinal (Guard) and the Chancellor (Archer). Author: Tony Quintanilla. Inventor: John W. Gast.
- General and Arch-General Chess. Variations of Bird's Chess. Author: Dominique Leste and Tony Quintanilla. Inventor: Dominique Leste.
- Gess. Combines GO with Chess: Invention of Archimedeans Mathematics Society, discussed by Ian Stewart in Scientific American. Author: Jeremy Gabriel Good. Inventor: Archimedeans Mathematics Society.
- Giant Chess. 16 x 16 variant with lots of powerful pieces and the unique four square occupying Dev piece which is not easy to capture. Author: Jeremy Gabriel Good. Inventor: Köksal Karakus.
- Giant Chess 2. Giant Chess but with the addition of giant Ferzes and 8 Leos. By Jeremy Gabriel Good.
- Gigachess. With 20 different pieces on a 14 x 14 board, this is the latest in a sequence from Shako to Tamerlane II to Perfect 12. Author: Jeremy Gabriel Good. Inventor: Jean-Louis Cazaux.
- Gigachess II. Evolution of Gigachess. 24 different types of pieces on a 14 x 14 board. By Jean-Louis Cazaux.
- Glinski's Hexagonal Chess (Symmetric). Missing description By Carlos Cetina.
- Go. Preset for Go and Go-Chess variants. Author: Tony Quintanilla.
- Go. Play Go with Game Courier. Author: Fergus Duniho.
- goChess. goChess. By Joe Joyce.
- Golden Age Chess on a Really Big Board. Play this 16 x 16 variant with several different pieces. Author: Nick Wolff. Inventor: Ralph Betza.
- Goldtoken.com . Website for turn-based online play.
- Gorgona Chess. V. R. Parton's Gorgona paralyzes enemy pieces so they can't move (with zrf). By M Winther.
- Grand Betza. Play Grand Betza on Game Courier. Author: Greg Strong. Inventor: John Davis.
- Grand Cavalier Chess. Decimal variant with Cannons and Cavalier Chess pieces. By Fergus Duniho.
- Grand Chess. Decimal variant with Cardinals and Marshalls. Author: Fergus Duniho. Inventor: Christian Freeling.
- Grand Combination Courier. Game with Compounds of Elemental (Atomic) FIDE Pieces Plus Camel, with Mostly Logical Promotions. By Jeremy Gabriel Good.
- Grand Rider Chess. If you love riders, you'll love Grand Rider Chess, which combines several different colorbound and non-colorbound riders. Author: Jeremy Gabriel Good and Larry Wheeler. Inventor: Larry Wheeler.
- Grand Shatranj. Grand Shatranj.... extends the examination of short-range leapers by looking at another 2-square jumper and 2 short-range riders. By Joe Joyce.
- Grand Shogi. Normal Shogi but with extra pieces - "Smooth and fantastic fun, awesome action". Author: Jeremy Gabriel Good. Inventor: Christine Bagley-Jones.
- Grand Tamerlane Chess. Variation of Mideast Chess by John Davis. Author: Tony Quintanilla. Inventor: John Davis.
- Grand Warp Point Chess. Using normal chess pieces, plus two warp points, on a 10 x 10 board where pawns can take large initial steps. Author: Jeremy Gabriel Good. Inventor: Jason Shields.
- Grande Acedrex. Missing description Author: Daniil Frolov.
- Grant Acedrex. Game Courier preset for Grant Acedrex with enforced rules. (12x12, Cells: 144) Author: Jean-Louis Cazaux and Daniel Zacharias.
- Grasshopper Chess. Each player has eight additional grasshoppers. Author: Antoine Fourrière. Inventor: Joseph Boyer.
- GraTiA. Preset for GraTiA, a blend of two historic variants. Author: Greg Strong. Inventor: Charles Gilman.
- Great Chess. An Indian/Turkish and very playable historic variant on a 10 by 10 board. Author: Fergus Duniho.
- Great Shatranj. What if chess evolved differently so short-range pieces became more powerful by gaining additional short-range moves? By Joe Joyce.
- Gross Chess. Play this 144 square variant online with Game Courier. By Fergus Duniho.
- Grotesque Chess. Play this variant of Capablanca's Chess that leaves no Pawns unprotected. By Fergus Duniho.
- Gryphon Aanca Chess. Large variant with Gryphons, Aancas, and a few other not-so-common pieces. By Gary K. Gifford.
- Gunnery Chess. Cannon pawns can leap over friendly piece and explode an enemy piece on the same file. By M Winther.
- Gunnery Chess (8x10). Cannon pawns can leap over friendly piece and explode an enemy piece on the same file. Regular pieces plus Mastodons. By M Winther.
- Gunnery Chess (with Scorpions). The Scorpion pawns have the additional capability of cannon-like moves. Very advanced. Only recommendable to grandmasters! By M Winther.
- Gustav III's Chess. Invented by King Gustav III of Sweden (1746-92). Author: M Winther. Inventor: King Gustav III of Sweden.
- Gustavian Camelrider Chess. Camelriders and regular pieces on a Gustavian (68squares) board. By M Winther.
- Gustavian Cannonrider Chess. Cannonriders and regular pieces on a Gustavian (68 squares) board. Cannonriders move differently depending on square colour. By M Winther.
- Gustavian-Camelrider Chess (with Scorpions). Camelriders and Scorpions on a 68 square Gustavian board. By M Winther.
- Gustavian-Cannon Chess. The Swedish Cannon moves like a Korean Cannon, but can move like a rook if it cannot jump (+zrf). By M Winther.
- Hadean Chess. Large chess with 12 pawns, 10 Ninja Pawns, 4 short-range linear jumpers, and Wazir/Ferz Zebra and Knight compounds. By Charles Daniel.
- Half Chess of Ralph Betza. Exactly like halfling chess, only the knights are replaced by crabs, making them more compatible with half moving rider pieces. Author: Jeremy Gabriel Good. Inventor: Ralph Betza.
- Half Chess Pawnless. "If Chess is wine, Half Chess is brandy. ". Author: Jeremy Gabriel Good. Inventor: John Groeneman.
- Half Courier. Missing description Author: Nick Wolff. Inventor: Charles Gilman.
- Hammer Chess. FIDE but with gnus instead of knights, cardinals instead of bishops and enhanced pawns. Author: Jeremy Gabriel Good. Inventor: Jim Aikin.
- Hanga Roa. Play Hanga Roa on Game Courier! Author: Tony Quintanilla and Juan Pablo Schweitzer Kirsinger. Inventor: Juan Pablo Schweitzer Kirsinger and Hernán Marcelo Domínguez Placencia.
- Hannibal Chess. Chess with added Modern Elephants (ferz-alfil compound) on 10x8 board. By Kevin Pacey.
- Hannibal Chess (GC preset with enforced rules). A Game Courier Preset for Hannibal Chess with enforced rules. Author: Jean-Louis Cazaux. Inventor: Kevin Pacey.
- Heavy Chess. Play Heavy Chess on Game Courier. Author: Greg Strong. Inventor: Jean-Louis Cazaux.
- Heavy Gravity Chess. Due to heavy gravity, Knights can't jump, Queens, Rooks, & Bishops can't move more than 4 spaces. Kings move like Ferz. By Gary K. Gifford.
- Heavy Shako. 10x10 variant inspired by Yangsi, made by Eric Silverman. (10x10, Cells: 100) By A. M. DeWitt.
- Hectochess. 10x10 variant that can be played with 2 mismatched Chess sets. By A. M. DeWitt.
- Henry VIII Chess Preset. This is the preset for Henry VIII Chess (unique take on Extinction Chess). Author: Rich Hutnik.
- Herculean Chess. Large board chess with augmented versions of Bishops, Rooks, Zebras, Knights and pawns. By Charles Daniel.
- Heroes Hex Chess version 2. Hexagonal Chess with new movement rules on a "standard" 91 hex board. By Tony Quintanilla.
- Heroes Hexagonal Chess. Play this game from the 84-square contest on the Play-By-Mail system! By Tony Quintanilla.
- Hex Dabbaba Qi. A Wellisch-style hex interpretation of Xiang Qi, indluenced by Toccata. Author: Abdul-Rahman Sibahi. Inventor: Charles Gilman.
- Hex Dragonal Chess. horizontal hex-rows and 4 defined directions of movement. By Graeme C Neatham.
- Hex Shogi 41. Hexagonal shogivariant on board with 41 spaces. By Fergus Duniho.
- Hex Shogi 81. A hexagonal Shogi variant on an 81-space board. By Fergus Duniho.
- Hex Shogi 91. A hexagonal Shogi variant on a 91-space board. By Fergus Duniho.
- Hexagonal Chess (Glinski). Chess on a board made out of hexagons. (Recognized!) Author: Fergus Duniho. Inventor: Wladyslaw Glinski.
- Hexagonal Chess (McCooey). Chess on a board, made out of hexes. (Recognized!) Author: Fergus Duniho. Inventor: Dave McCooey.
- Hexagonal Chess with Hexagonalers. Missing description By Jeremy Gabriel Good.
- Hexagonal Hole Chess. A hexagonal variant of Hole Chess. Engineers can move holes and barriers. Teleporters can relocate enemy pieces. By Gary K. Gifford.
- Hexagonal Raumschach. 3D analogue of Glinski's Hexagonal Chess based on Raumschach. By Kevin Pacey.
- Hexajedrez. Variant of Dave McCooey's Hexagonal Chess. By Carlos Cetina.
- Hexcetran Chess. Play Hexcetran Chess at Game Courier. By Carlos Cetina.
- Hexes Chess. Hexes Chess now available for play on the Game Courier! Author: Mike Layfield and Tony Quintanilla. Inventor: Mike Layfield.
- Hexetera. Play Hexetera on the Game Courier! Author: Tony Quintanilla. Inventor: Roberto Lavieri.
- Hexmate. A two-player variant on a hex board made up of 127, 3-color hexagons. Author: Fergus Duniho. Inventor: Michael A. Rouse.
- Hiashatar. Mongolian Decimal Chess. By Jose Carrillo.
- Hindustani Chess. 19th century Indian game. Author: Tony Quintanilla and John Ayer. Inventor: _unknown.
- Hole Chess. Variant on a board of 44 squares with two holes that pieces can be dragged into. Author: Peter Aronson. Inventor: Gary K. Gifford.
- Holy Grail. Extended chess game with ability to drop a mutating piece and a crown price that changes the winning conditions. By Charles Daniel.
- Hopper Chess (with Scorpions). Pieces standing before friendly pieces can jump over enemy Scorpion pawn and land directly behind it. By M Winther.
- Hopper-Chess. Pieces in front of friendly pieces can land immediately behind enemy pawns. By M Winther.
- Hopper-Elk Chess. Pieces can hop over an enemy pawn and land directly behind it. The Elk moves differently depending on square colour. By M Winther.
- Hostage Chess. Play this Chessgi-like game in which no pieces change sides. (Recognized!) Author: Fergus Duniho. Inventor: John Leslie.
- Hour Glass Chess. Small variant with simple pieces and hour glass shape. By Jeremy Gabriel Good.
- House of 10 Mirrors - H o M Variant. Reflective pieces from up to 10 mirrors add to offense and defense. By Gary K. Gifford.
- House of Mirrors Chess. Mirrors and reflective pieces add interesting twists to strategy by making pieces appear in 2 or 3 places at the same time. By Gary K. Gifford.
- Hubbub. Preset for Hubbub, a short-range version of Brouhaha. By Greg Strong.
- Hullabaloo. Fusion, fission game with drops, giant conglomerations and two types of activation. By Jeremy Gabriel Good.
- Hunt Chess. Huntsman Chess and Groundskeeper Chess. Author: John Smith. Inventor: Yu Ren Dong and John Smith.
- HyperModern Shatranj. Missing description By Joe Joyce.
- I'm a Ferz, Get Me Into There!. Inspired by title of Chas. Gilman's game, "I'm a Wazir, Get Me Out of Here!" Object is to get your Ferz to Z5. By Jeremy Gabriel Good.
- I'm a Wazir, Get Me Out of Here. Game composed of just wazirs and pawns. Wazirs, prone to special disappearing rule. Object : Get rid of your wazirs. Author: Jeremy Gabriel Good. Inventor: Charles Gilman.
- I-Chess. Play this 12x12 large board game with two new peices. Author: Greg Strong.
- Ibu Ibu Chess. Ibu Ibu Chess in which the king's entourage protects it from Ubi-Ubis. By Jeremy Gabriel Good.
- Ideal Chess. Uses compound pieces to mimic the use of cards. By Graeme C Neatham.
- Imperial Chess. Play this large variant with new pieces and victory by capture of royal pieces! Author: Tony Quintanilla and James Killian Spratt. Inventor: James Killian Spratt.
- Imposter Chess. Play this game! Exchange captured pieces in order to move Kings in different ways. Author: Tony Quintanilla and Laila W. Stefan. Inventor: Laila W. Stefan.
- Improved Chess. An improvement of standard chess: a blocked pawn on the far side gets extra jump moves to empty squares (with zrf). By M Winther.
- Indistinguishable Chess. All pawns and pieces appear the same in color and size, for both sides. The board has no 'dark' squares. By Gary K. Gifford.
- Insane Ninja Chess. Play this exciting chess variant featuring two pairs of unique multi-mode pieces: Insane Ninjas and Mad Leaping Ninja Guards. By Charles Daniel.
- Interdependent Chess. A 42 square variant in which pieces borrow capturing ability from other pieces. By Fergus Duniho.
- Invasion. A military inspired Chess variant played on an 84-square board. Author: Antoine Fourrière. Inventor: Jean-Louis Cazaux.
- Jacks and Witches. Play this variant on 84 squares with special pieces and special squares! By Antoine Fourrière.
- Janus Chess. Play Janus Chess on Game Courier. Author: Fergus Duniho. Inventor: Werner Schoendorf.
- Janus Kamil Chess. A crossover between Janus Chess and Modern Kamil Chess. By Jörg Knappen.
- Jester Chess. Featuring pieces that mimic last piece moved, archers that can either capture OR move. quadrapawns, and murray lions. Author: Jeremy Gabriel Good. Inventor: Thomas Havel.
- Jetan. Play Edgar Rice Burrough's Jetan (Martian Chess). Author: James Killian Spratt and Jean-Louis Cazaux. Inventor: Edgar Rice Burroughs.
- Jetan Jeddara. Large variant of Jetan. Author: Tony Quintanilla and James Killian Spratt. Inventor: James Killian Spratt.
- Jetan Sarang. Play this large variation of Jetan! Author: James Killian Spratt and Tony Quintanilla. Inventor: James Killian Spratt.
- Joe Joyce Hyperchess. Easy to play 3D Chess variant where pieces can act on small board or large board. Author: Jeremy Gabriel Good. Inventor: Joe Joyce.
- Judkin's Shogi. Modern small shogi variant preset. Author: Charles Daniel and Armin Liebhart. Inventor: ? Judkin.
- Jumping Chess. Pieces capture by jumping. Board has extra edge squares making it 10x10. By Peter Aronson.
- Jumping Knights Chess. Nightriders replace Knights and War Machines have also been added to Jumping Chess. By David Paulowich.
- Jungles and Mountains Chess. Bull-Dozers must clear through jungle brush and Engineers must make passages through mountains to free up piece movement. By Gary K. Gifford.
- Juxtaposition Chess. Normal moves, plus pawns switch places with stones; pieces switch places with flags. By Gary K. Gifford.
- Kamikaze Mortal Shogi. Send your Kamikazes on suicide missions in this Shogi variant. Author: Fergus Duniho. Inventor: Fergus Duniho and Roberto Lavieri.
- King to Bunker Leap. Play this exciting version of Pre-Chess using new king safety rules. By Charles Daniel.
- King's Guard Chess. Missing description By Graeme C Neatham.
- King's Reincarnation. Captured Kings return to the board, but at a price. By Gary K. Gifford.
- Kinglet. Play Kinglet, where you win by capturing all pawns. Author: Greg Strong. Inventor: Vernon Rylands Parton.
- Kings. Kings on the Game Courier. By Abdul-Rahman Sibahi.
- Kings Reincarn. II - Altered States Variant. Captured Kings return to the board by replacing a friendly piece and moving as it did. By Gary K. Gifford.
- Knight Court Chess. When you take an opponent's piece, he gets to drop it back on the board. Object: Checkmate knight. Author: Jeremy Gabriel Good. Inventor: Jason D. Wittman.
- Knight-Pawn Chess. Elegant chess game with knight-pawns that can move as pawns midway up the board if they find themselves behind it. Author: Jeremy Gabriel Good. Inventor: Matthew Montchalin.
- Knight-Relay Chess. Uncapturable Knights give other pieces the ability to move as Knights. By Carlos Cetina.
- Knightmate. Play Knightmate, where you win by mating the Knight. Author: Greg Strong.
- Kobayashi Maru Variant of Star Trek 3-D Chess. A variant set of rules for playing chess using the 3 dimentional set featured on the TV series Star Trek. Author: Larry L. Smith and Tony Quintanilla. Inventor: Larry L. Smith.
- Koksal Karakus' En Passant Chess -. All pieces have the en passant option. Author: Jeremy Gabriel Good. Inventor: Köksal Karakus.
- Korean Chess. Play Korea's regional Chess variant on Game Courier. Author: Fergus Duniho.
- Koval's Hexagonal Chess. Game Courier Preset to play Koval's Hexagonal Chess. By Max Koval.
- Kozune. Missing description By Daniil Frolov.
- Kozune vs FIDE. Missing description By Daniil Frolov.
- l. Missing description By Daniil Frolov.
- Ladder Chess. Non-competing 40 Square contest entry with scaling board. Author: Jeremy Gabriel Good. Inventor: Sergey Sirotkin.
- Ladorean Chess. Another 10 x 8 Fergus Duniho variant with marshall and cardinal. Author: Jeremy Gabriel Good. Inventor: Fergus Duniho.
- Large Nahbi Chess. Preset for Large Nahbi Chess. By Uri Bruck.
- Latrunculi duo milia et septum. Chess with rook/ferz & bishop/wazir substitutes for rooks and bishops. By Gary K. Gifford.
- Leandro's 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.
- Leapers Chess. Decimal variant with additional leaping abilities for each of the pieces. By Larry L. Smith.
- Leapers Creeepers. Featuring compound long leapers of giraffes, zebras and camels. Author: Jeremy Gabriel Good. Inventor: Christine Bagley-Jones.
- Lemurian Shatranj. Lemurian pieces which utilize either or both types of their possible moves, possibly changing direction after the first. By Joe Joyce.
- Lines of Relay. The addition of a piece - the "Lore Apprentice" adapted from the Querquisite. "LoR(e)" stands for Lines of Relay. Author: Jeremy Gabriel Good. Inventor: Jörg Knappen.
- Lions and Unicorns Chess. Play this large Chess variant with Lions and Unicorns. Author: Greg Strong. Inventor: David Paulowich.
- Little River Chess. 46 Cell game with Chinese Chess influence. Kings confined to palaces. By Gary K. Gifford.
- Little Trio. Missing description Author: Nick Wolff. Inventor: Jared B. McComb.
- Logical Follow-Up to Duke of Rutland Chess. Derivative of The Duke of Rutland's Chess with other compound pieces. Author: Jeremy Gabriel Good. Inventor: Claudio Martins Jaguaribe and Jeremy Gabriel Good.
- Loonybird. Pieces on a seven by seven board move differently when they take. Author: John Smith. Inventor: Christian Freeling.
- Los Alamos Chess. First known variant played by a computer. (Recognized!) Author: Jason Shields.
- Losing Chess. Taking is obligatory; the first player that loses all his pieces wins. Author: Antoine Fourrière.
- Maasai Chess. Play Maasai Chess with Game Courier. By Jean-Louis Cazaux.
- Maces and Horse-apults. Similar to chess, but on a 10 x 10 board and the addition of Maces and Horse-apults. By Gary K. Gifford.
- Maces, Horse-apults, and Tulpas. Maces and Horse-apults with user-created Tulpa pieces. By Gary K. Gifford.
- Maces, Shields, and Horse-apults. Like Maces and Horse-apults, but pawns are protected from Mace capture. By Gary K. Gifford.
- Macrochess. Missing description Author: Daniil Frolov and Jean-Louis Cazaux. Inventor: Robert Potter.
- Mad Chess (Steel=White). Chess variant with unequal armies on 10 by 10 board. Author: Fergus Duniho. Inventor: Jason D. Wittman.
- Mad Chess (Stone=White). Chess variant with unequal armies on 10 by 10 board. Author: Fergus Duniho. Inventor: Jason D. Wittman.
- Mad Elephant Chess. Missing description By Daniil Frolov.
- Mad Queen Shogi. Play this new Chess/Shogi hybrid on Game Courier. Author: Fergus Duniho. Inventor: Larry L. Smith.
- Magicpawns Chess. Any piece can move to friendly pawn and change place with it. Pawns thus become more dynamic and pieces less constrained. By M Winther.
- Mainzer Schach. 11 x 8 variant with two Januses and one Marshall, and different setup. Author: Tony Quintanilla. Inventor: Jörg Knappen.
- Makruk. Play the traditional Chess variant of Thailand on Game Courier. Author: Jose Carrillo.
- Mamra Chess. Adds the Mamra, a piece that only Pawns may capture. Author: Tony Quintanilla and George Tsavdaris. Inventor: George Tsavdaris.
- Mamra Chess with Wuss. Variant combining very strong Mamra piece with weakening Wuss piece. By Jeremy Gabriel Good.
- Maorider Chess. Missing description By Vitya Makov.
- Mapped Chess. Mapped Chess Game with extended 3D moves mapped on 2 boards. (2x(8x8), Cells: 128) By Stephane Burkhart.
- Marseillais Chess. Move twice per turn. (Recognized!) Author: Fergus Duniho.
- Mastodon Chess. Standard pieces plus two Mastodons per side. A strategical big-board variant. By M Winther.
- Mastodon Chess (8x10). Standard pieces plus two Mastodons per side. A strategical big-board variant. By M Winther.
- Maxima. Play Maxima, an interesting and exiting variant of Ultima, with new elements that make Maxima more clear and dynamic. Author: Roberto Lavieri and Antoine Fourrière. Inventor: Roberto Lavieri.
- Mayhem Chess. Different pieces and setup. Author: Tony Quintanilla. Inventor: Christina Ziolkowski.
- Medusa Shogi. A Shogi variant of Pillars of Medusa, which is based on Turkish Great Chess. By Gary K. Gifford.
- Mesmer Chess. Introduces a new piece, the mesmerist, which can control how opposing pieces move. Author: Jeremy Gabriel Good. Inventor: Dan Troyka.
- Metamachy. Play this large game with a variety of regular fairy pieces. Author: Fergus Duniho. Inventor: Jean-Louis Cazaux.
- Metamorph Chess. Play this variant in which pieces frequently promote or demote. By Fergus Duniho.
- Meteoric Chess. A sober but lively drop chess variant with standard pieces (zrf available). By M Winther.
- Mid-evil Chess. Adds a Prince (combines the moves of queen and knight) to Capablanca's array by eliminating one knight... By Stephen R. Stockman.