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- Flexible Palace and Flexible River Xiang Qi. Boundaries of Palaces and the River are determined by the location of the Advisors, Generals, Elephants, and Soldiers. (9x10, Cells: 90) By John Smith.
- Flight and Ferry. The gold dragon of Wessex fights the red one of Wales across the Bristol Channel. (8x10, Cells: 80) By Charles Gilman.
- Flip Chess and Flip Shogi. Pieces have two sides with different movements on board of 38 squares. (7x6, Cells: 38) (Recognized!) By John William Brown.
- FlipFlop. A minimalistic Chess-like game with only one type of piece. Author: Ola Sassersson. Inventor: Masahiro Nakajima.
- Flipping Xiangqi. Hybrid of Xiangqi & Kyoto Shogi – flip the pieces after each turn. (7x7, Cells: 49) By Lev Grigoriev.
- Floßschach. Part of the board is a lake, where rafts can transport pieces. (8x8, Cells: 64) Author: Jörg Knappen.
- Fluid Chess. A modest variation allowing movement through friendly pieces. (8x8, Cells: 64) By Joe Joyce.
- Fluidity chess. No displacement capture, all non-royal pieces take by cutting through or bypassing. (8x8, Cells: 64) By Lev Grigoriev.
- Flying Bombers with Hangars. Features the flying bomber - a versatile dual range piece that captures by flying over the enemy. (8x8, Cells: 68) By Charles Daniel.
- Flying Dutchman. Win by Reaching Port. (8x8, Cells: 64) By George William Duke.
- Fog of War Chess. Players can only see certain squares. Plays on a computer application. (8x8, Cells: 64) Author: William Lee Sims. Inventor: Cameron Hendricks.
- Folding Magnetic Chess. fold between D&E files, play on both sides. Author: Deep Thought.
- Follow the King!. Pieces must make the same move as their King. (8x8, Cells: 64) By Ed Pegg Jr..
- FOOD FIGHT!!!. Besides a Royal Chef, all the pieces are named after food items. (12x12, Cells: 144) By Bob Greenwade.
- Fool's Hexagonal Chess. designed to be a close (the closest?) hexagonal equivalent to orthodox chess. (Cells: 96) By Graeme C Neatham.
- Foolish King Chess. Players have different armies and victory conditions. White has a fool for a king. (10x8, Cells: 80) By Patrik Hedman.
- Football Chess. A Football/Soccer game played with Chess pieces. (9x9, Cells: 81) Author: Hans L. Bodlaender. Inventor: Joseph Boyer.
- For the Crown. A commercial crossover with deck-building games. (8x8, Cells: 64) By Jeremy Lennert.
- Force Field Chess. Missing description (8x8, Cells: 64) By Douglas Yale Kaplan Seiden-Sacharovich.
- Forchess . Four player chess variant on 8 by 8 board. By Tom Rogers.
- Foreign Policy Chess. Chess variant on 8 by 8 board with armies of unequal strength. (8x8, Cells: 64) By Francois Tremblay.
- Fortress. Die roll determines which type of piece is moved. By Ronald Drinning.
- Fortress chess. An old Russian variant for four players. (Cells: 192) Author: Hans L. Bodlaender.
- Forward Chess. Variant where backward movement is limited. (8x8, Cells: 64) By Michael Nelson.
- The Forward FIDEs. A team for Chess with Different Armies where pieces can advancer easier than retreat. By Ralph Betza.
- Forwards Chess. A variation of FIDE Chess where pieces only move forward. (8x8, Cells: 64) By Rich Hutnik.
- Four Armies. Each player controls two armies. (10x10, Cells: 100) By Patrick Riley.
- Four Double-Acts Chess. Specifically long- and shart-range versions of the Friend, Joker, and Orphan. (10x10, Cells: 100) By Charles Gilman.
- Four File Chess. Variant on 4 by 10 board. (4x10, Cells: 40) By Kris Barski.
- Four Handed Perspective Chess. Missing description
- Four Handed Roman Chess. 4 player chess variant with additional new piece. By Mark Woodall.
- Four Player Shogi. Variant of Shogi for four players. (15x15, Cells: 189)
- Four Row Chess. Missing description (Cells: 208) By Eric S. Clayton.
- Four seasons chess.. Medieval multiplayer chess variant on 8 by 8 board. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- Four Towers. Irregular board with special tower squares upon which pieces can combine with each other or detach from each other. (Cells: 85) By Jim Aikin.
- Four-Fold Chess. Missing description (16x16, Cells: 256) By Larry L. Smith.
- Four-Handed Elephant Chess. A 4-Player (2 Team) game based on 3-Elephant Chess and 4-handed chess. (11x11, Cells: 97) By Gary K. Gifford.
- Fractal Chess. Missing description (2x(8x8), Cells: 80) By Stephane Burkhart.
- Fraction Shogi. Shogi with fractional moves. (9x9, Cells: 81) By (zzo38) A. Black.
- Fragnurasian Qi. A two-River variant with the whole of two identical Wildeurasian Qi sets minus the second King. (13x15, Cells: 195) By Charles Gilman.
- Franklin Grand Chess. On 10 by 10 board with combination pieces and random setup. (10x10, Cells: 100) Author: Ken Franklin and Hans L. Bodlaender. Inventor: Ken Franklin.
- Freakshow Chess. Missing description (9x8, Cells: 72) By Patrik Hedman.
- Free Castling Rule. Less restrictive castling rules. (8x8, Cells: 64) Author: Roger Cooper.
- Free Chess. Dissociate movement-abilities from physical pieces. The opening setup is an empty board. (13x13, Cells: 156)
- Free Choice Chess. Free Choice Chess -- Large variant where players choose and deploy their own forces. By Bruce R. Gilson.
- Free corners chess. In the corners of seven by seven board, three squares form together one field. (7x7, Cells: 41) By Sergey Sirotkin.
- Free Placement. Game starts with players alternatingly placing pieces on board. (8x8, Cells: 64) By Roger Cooper.
- Free-for-All Chess. Player's may move either their own or their opponent's pieces. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Jed Stone.
- French revolution chess. Advanced pawns threaten the noble pieces. (8x8, Cells: 64) By Hans L. Bodlaender.
- A Friendly Game of Chess. Each side has Friends, and several odd pieces. Insanity ensues. (12x12, Cells: 144) By Bob Greenwade.
- Frog Chess. Play chess with added frogs (ferz-threeleaper compound) on 10x8 board. By Kevin Pacey.
- Frog Chess with Gryphon and Falcon. Expansion for frog chess. (10x9, Cells: 90) By Aurelian Florea.
- Frog Chess with Manticore and Falcon. Expansion for frog chess. (10x9, Cells: 90) By Aurelian Florea.
- Froghouse. Like Bughouse except each team has a Black, White, and Green. Green goes "in between", namely after white but before black. (8x8, Cells: 64) By Jordan Lampe.
- Frontofhouse. Captured pieces return with only their forward moves. (8x8, Cells: 64) By Charles Gilman.
- FTM Chess: Follow the Mover. After a normal move, you may move a piece to the vacated square. (8x8, Cells: 64) Author: Alessandro Castelli. Inventor: Gianluca Vecchi.
- Fugue. Based on Ultima and Rococo this game has pieces that capture in unusual ways. (8x8, Cells: 64) By Michael Nelson.
- Full Cavalry. Rooks are replaced by Lancers and castling is still legal. By JT K.
- Full Double Chess. 32 pieces each, including all combinations of the basic Chess pieces, on a 16x8 square board. (16x8, Cells: 128) By Sergey Sirotkin.
- Full House. Missing description (8x8, Cells: 64) By Topher Gayle.
- Full house hexagonal chess. Game with 50 pieces. (11x11, Cells: 91) By Kevin Pacey.
- Fun-in-a-Box Chess. Featuring Thing One and Thing Two from The Cat in the Hat. By David Howe.
- Furious Courier. Courier Chess with a Modern Queen and Crooked Bishops. (12x8, Cells: 96) Author: Peter Aronson. Inventor: Nuno Cruz.
- Fusion Chess. Variant in which pieces may merge together or split apart. (8x8, Cells: 64) By Fergus Duniho.
- Fusion Chessgi. A hybrid of Fusion Chess and Chessgi. By Fergus Duniho.
- Fusion Diamond 41. A Fusion Chess variant played on a diamond shaped board of 41 squares. (Cells: 41) By Fergus Duniho.
- Fusion Mitregi. Shogi board, camps full of Mitregi 1st/2nd rank pieces that can combine pairwise. (9x9, Cells: 81) By Charles Gilman.
- Futashikana Shogi. Expanded version of Shosu Shogi played on an 11x11 board. By A. M. DeWitt.
- Future Chess. With extra empty corner squares. Pieces can be relocated before play begins. Creates immense strategical variance (with zrf). By M Winther.
- Gadsden's Toroidal Chess. Edges of the board are considered to be adjacent. (8x8, Cells: 64) By Richard Gadsden.
- Gala. Medieval game of German farmers. (10x10, Cells: 100) Author: Hans L. Bodlaender.
- Gala (Farmer's Chess). Gala, a medieval cross between chess and tafl games. New rules reconstruction (with zrf). By M Winther.
- Gala Xiang-Qi. Crossover game. (16x16, Cells: 256) By Daniil Frolov.
- The Game for the Trees. Pieces grow on the board, occupying multiple squares. (8x8, Cells: 64) By Ralph Betza.
- The Game of Nemoroth. For the sake of your sanity, do not read this variant! (8x8, Cells: 64) By Ralph Betza.
- The Game of the Three Kingdoms. inese Chess for three players (Game of the Three Kingdoms). (Cells: 135) Author: David Howe and Various.
- The Game of Three Friends. A variant on Chinese Chess for three players. (Cells: 135) Author: David Howe and Various. Inventor: Jìndé Zhèng.
- The Game of Three Generals. Each player has three generals, which command different sections of his army. (9x9, Cells: 81) By John Smith.
- Gamma2 Chess. Chess on a 10x8 board with Berolina Pawns & special Ship & Archer pieces. (10x8, Cells: 80) By Kevin Pacey.
- Ganeshan Chess. Introducing a new Elephant piece known as (the) Ganapati. (10x10, Cells: 100) By Simon Edward Jepps.
- Ganymede Chess. A 12x12 variant inspired by Ralph Betza's Chess on a really big board, Centennial Chess and Adrian King's Typhoon (among others). (12x12, Cells: 144) By Mark Hedden.
- Gast's Chess. Large 1969 variant using the Cardinal (Guard) and the Chancellor (Archer). (12x12, Cells: 144) Author: John Ayer. Inventor: John W. Gast.
- Gastrophete Chess. Introducing the Gastrophete, a catapult capable of hurling other pieces over its head (zrf exists). By M Winther.
- Gateway Chess. Pieces go a long way round to reach enemy territory. (8x10, Cells: 68) By Charles Gilman.
- Gaul Chess. Introducing the Gaul, which captures like a bishop, but moves by the bifurcated jump method, on an H-board (zrf available). By M Winther.
- General and Arch-General Chess. Variations of Birds' Chess. (10x8, Cells: 80) By Dominique Leste.
- Generals' Chess. Missing description (9x9, Cells: 81) By Patrik Hedman.
- Generic Chess Piece Creation System. This is a system for construction of pieces, using ideas from RPG games. By Guilherme S Töws.
- Genetess. A play-by-email game with genetically encoded pieces. By Robert Kydd.
- Geometric sequence of Chess Games. Chess variants as large as you want.
- Gess. A Chess variant played on a Go board where pieces are collections of go stones. (18x18, Cells: 324) Author: Edward Jackman. Inventor: Archimedeans Mathematics Society.
- Ghast knights. Missing description (8x8, Cells: 64) By Daniil Frolov.
- Ghost King Chess. The king can roam the board as an almost unkillable ghost. (8x8, Cells: 64) By H. G. Muller.
- Ghostarelay. Game with ghost and relay, win if you have no legal moves. (10x10, Cells: 100) By (zzo38) A. Black.
- Ghostrider Chess.. Missing description (8x8, Cells: 64) By Claudio Martins Jaguaribe.
- Gi-Qi-Game. Another one crossover of European, Chinese and Japanese chess. (9x9, Cells: 81) By Daniil Frolov.
- Giant Chess. 16x16 board with the same pieces as Turkish Chess, but also the "Dev" piece which takes up four squares. (16x16, Cells: 256) By Köksal Karakus.
- Giant-King Chess. Kings take up four squares each, all of which must be attacked to check. (10x10, Cells: 100) By Robert Shimmin.
- Gigachess. On 14 by 14 board with 20 different pieces. (14x14, Cells: 196) By Jean-Louis Cazaux.
- Gigachess II. Evolution of Gigachess (2001). By Jean-Louis Cazaux.
- Gilman's Modest Variants. Missing description (8x8, Cells: 64) By Charles Gilman.
- Give & Take Chess. After setting up pieces, players must capture each turn. (8x8, Cells: 64) By Mark Thompson.
- Giveaway Chess. Taking is obligatory; the first player that loses all his pieces wins. (8x8, Cells: 64) (Recognized!) Author: Hans L. Bodlaender and Antoine Fourrière.
- Glacial Shift. 4-player game played with Icehouse pieces with Shogi-style captures and where the same piece moves differently for each player. (10x10, Cells: 100) By Jared B. McComb.
- Gladiator Chess. Missing description (8x8, Cells: 64) By David Fisher.
- Gladiatrix Chess. Introducing the Gladiatrix, an extremely agile female gladiator, on an H-board (zrf available). By M Winther.
- Gleeman Chess. Missing description (9x9, Cells: 81) By Patrik Hedman.
- Glinski's Hexagonal Chess. Chess on a board made out of hexagons. (Cells: 91) (Recognized!) Author: Hans L. Bodlaender. Inventor: Wladyslaw Glinski.
- Global Chess. A chess game played on a board composed of two rotating disks. (2x(), Cells: 64) Author: Robert LeRoy.
- Gnu. Simple game featuring the Gnu as promotee. (5x10, Cells: 50) By Joost Aan de Brugh.
- Gnu Qi. A cross between Anglis Qi and Wildebeest Chess. (9x9, Cells: 81) By Charles Gilman.
- Go with chess pieces. Generalization of go-rules using chess pieces. (19x19, Cells: 361) By Hans L. Bodlaender.
- Go-Chess (tm) . Place your own pieces on a large board. By Jim Callan.
- Goal Box Chess. Game on 42 squares with no King and the goal of placing pieces into 2 special squares. (5x8, Cells: 42) By Kevin McPartland.
- Goatsuckers. Small modern shogi variant on 5 by 5 board. (5x5, Cells: 25) and Patricia Hernandez.
- goChess. goChess. (19x19) By Joe Joyce.
- Golden Age Chess On a Really Big Board. Variant on 16 by 16 board with several different pieces. (16x16, Cells: 256) By Ralph Betza.
- Golem Chess. Variant where the Queen is replaced by the Golem, a piece that must be captured twice to remove it from play. (8x8, Cells: 64) Author: Peter Aronson. Inventor: Peter Aronson and Ben Good.
- Goliath Chess. Pieces can shoot after they have captured. (8x8, Cells: 64) Author: Alessandro Castelli.
- Good and Evil Chess. Missing description (8x8, Cells: 64) By Larry L. Smith.
- Goodchess. Missing description (8x8, Cells: 64) By Este.
- Gorgona Chess. V. R. Parton's Gorgonia Chess (also Gorgon Chess), featuring the paralyzing Gorgonia (with zrf). By M Winther.
- GoshawkChess. Variant of Capablanca Chess with two Goshawks per side replacing the Archbishop and Chancellor. By James Zuercher.
- Gothic Chess. A 10x8 variant using the same rules and equipment as Capablanca's Chess. (10x8, Cells: 80) Author: Fergus Duniho. Inventor: Ed Trice.
- Gothic Isles Chess. Fictional historic variant, with Dragons, Wizards and Champions. (8x8, Cells: 64) By Peter Aronson.
- Grand Alamos Chess. FIDE, but with an initial setup reminiscent of Grand Chess. By Jeff Cornell.
- Grand Apothecary Chess-Alert. Very large Board variant obtained trough tinkering with known games. By Aurelian Florea.
- Grand Apothecary Chess-Classic. Very large Board variant obtained trough tinkering with known games. By Aurelian Florea.
- Grand Apothecary Chess-Modern. Very large Board variant obtained trough tinkering with known games. By Aurelian Florea.
- Grand Cavalier Chess. The decimal version of Cavalier Chess. (10x10, Cells: 100) By Fergus Duniho.
- Grand Chess. Christian Freeling's popular large chess variant on 10 by 10 board. Rules and links. (10x10, Cells: 100) (Recognized!) Author: Greg Strong and Hans L. Bodlaender. Inventor: Christian Freeling.
- Grand Chess Comments. Notes on Grand Chess and a variant. (10x10, Cells: 100)
- The Grand Crossing. Win by moving your king to the opponents side of the board. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Henk Breugem.
- Grand CwDA: the Shatranjians. Grand CwDA. (10x10, Cells: 100) By Joe Joyce.
- Grand Dice Chess. Grand Dice Chess Battle on a 12x12 board with four dice. By Вадря Покштя.
- Grand Ducal Chess. Missing description (12x8, Cells: 96) By John Ayer.
- Grand hecatomb. Missing description (12x12, Cells: 144) By Daniil Frolov.
- Grand Hexachess. Large hexagonal chess variant. (Cells: 127) By Derick Peterson.
- Grand House. Bughouse and CrazyHouse applied to Grand Chess. (2x(10x10), Cells: 200) By Abdul-Rahman Sibahi.
- Grand Shatranj. Grand Shatranj. (10x10, Cells: 100) By Joe Joyce.
- Grand Shatranj N W. Shatranj with 10 individual pieces + pawns per army. (10x10, Cells: 100) By Mark Simpson.
- Grand Tamerlane. John Davis invented this variation of Mideast Chess. (10x10, Cells: 100) Author: Tony Quintanilla. Inventor: John Davis.
- Grande Acedrex. A large variant from 13th century Europe. (12x12, Cells: 144) Author: Hans L. Bodlaender.
- Grander Chess. A variant of Christian Freeling's Grand Chess. (10x10, Cells: 100) By Kevin Scanlon.
- Granlem Shatranj. This is a mash-up of Grand Shatranj & Lemurian Shatranj with a 3 moves/player turn option. By Joe Joyce.
- Grant Acedrex. Medieval large chess variant according to recent historians's work. (12x12, Cells: 144) Author: Jean-Louis Cazaux.
- Grasshopper Chess. Each player has eight additional grasshoppers. Author: Hans L. Bodlaender. Inventor: Joseph Boyer.
- GraTiA. A blend of two historic variants. (13x12, Cells: 156) By Charles Gilman.
- Gravity Chess. Pieces that moved attract pieces like magnets. (8x8, Cells: 64) By João Pedro Neto.
- Great battle. based off ultimate battle chess. (8x8, Cells: 64) By Andy Maxson.
- Great battle 2nd edition. the sequal to great battle chess! (8x8, Cells: 64) By Andy Maxson.
- Great Chess. An Indian/Turkish and very playable historic variant on a 10 by 10 board. (10x10, Cells: 100) Author: Hans L. Bodlaender.
- Great Herd. Large variant with Camel, Zebra, Bison, Gnu and Gazelle pieces. (10x8, Cells: 80) By Charles Gilman.
- Great Shatranj. Great Shatranj. (10x8, Cells: 80) By Joe Joyce.
- Great Stour. Diagonal-heavy mixed-camp variant on Courier board with River. (12x8, Cells: 96) By Charles Gilman.
- Greek Progressive Chess. Make at most one move more than your opponent in his last turn. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Kostas Prentos.
- Greener Chess. The grass is always greener on the other side of the fence -- and your pieces are stronger there too. (8x8, Cells: 64) By Ralph Betza.
- Greg White's Chess Variants . Missing description Author: David Howe. Inventor: Greg White.
- Grenadier Chess. Introducing the Grenadier piece on an H-shaped board. A game for the attacking player. With zrf. By M Winther.
- Grid Chess. Always move to a different 2 by 2 square part of the board. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Walter Stead.
- Gridlock. Large, wargame inspired variant. (10x10, Cells: 100) By Paul Leno.
- Gross Chess. A big variant with a small learning curve. (12x12, Cells: 144) By Fergus Duniho.
- Groundskeeper Chess. Missing description (8x8, Cells: 64) By Yu Ren Dong.
- Gryphon Aanca Chess. Large Variant with Gryphons, Aancas, and a few other not-so-common pieces. (12x12, Cells: 144) By Gary K. Gifford.
- Guanaco Chess. Introducing the Guanaco that hops two squares orthogonally continuously (with zrf). By M Winther.
- Guard Chess, or Islandic Chess. Guarded pieces cannot be captured. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- Gufuu Shogi . Tiny variant on a 2x3 board with four pieces. By Georg Dunkel.
- Guru Mahachaturanga. 2d India-specific offshoot of AOF series. (12x12, Cells: 144) By Charles Gilman.
- Guschess. Pieces can freely move in one of 38 areas on the board. (8x8, Cells: 38) By Gustavo A. Vargas.
- Gustavian Adjutant Chess. Standard chess with empty extra corner squares and extended castling (with zrf). By M Winther.
- Gustavian Cannon Chess. Featuring the remarkable Swedish Cannon on a Gustavian board, where it thrives (zrf available). By M Winther.
- Gyokugi. Extends chevron ranks to analogues of Shogi generals, named after individual jewels. (11x11, Cells: 91) By Charles Gilman.
- Hafts. A denser Draughts, but with pieces only capturing those bound to the opposite colour. (8x8, Cells: 64) By Charles Gilman.
- Haiku Shogi. 4-player Shogi with 5+7+5 grouping of orthogonals in both dimensions. (17x17, Cells: 289) By Charles Gilman.
- Hajiku Shogi. Inspired by Shogi and Chu Shogi. Pieces can both promote and demote in promotion zone. By Edward Webb.
- Half Bughouse. Another name for Anywhere Chess. (8x8, Cells: 64) Author: Hans L. Bodlaender.
- Half Chess. Pieces have approximately half their usual movement possibilities. (8x8, Cells: 64) By Ralph Betza.
- Half Chess. On a 4 by 8 board without pawns. (4x8, Cells: 32) By John Groeneman.
- Half Courier. A Pawnless variant rearranging a slightly simplified Courier back rank onto two ranks. (6x8, Cells: 48) By Charles Gilman.
- Half Nearlydouble Chess and offshoots. Chess enlarged and then shrunk again - or vice versa. (5x12, Cells: 60) By Charles Gilman.
- Half Shogi and Half Xiang Qi. Applying the principles of Half Chess to Oriental games. (5x9, Cells: 45) By Charles Gilman.
- Half-Random Chess. Three pieces are placed randomly, the other five by the players. By Davor Vujacic.
- Halfgi. A hybrid of Chessgi and Ralph Betza's Half Chess. (8x8, Cells: 64) Author: Fergus Duniho. Inventor: Peter Aronson.
- Halfling Chess. Game where all pieces (except Knights) are Halflings. (8x8, Cells: 64) By Ralph Betza.
- Halloween Knight Court. Halloween-themed variant on a tiny board. (3x3, Cells: 9) By Jason D. Wittman.
- Hamiltonian Chess. Win by forming a Hamiltonian path between your pieces. (8x8, Cells: 64) By David Fisher.
- Hammer Chess. Minor pieces have increased movement possibilities. (8x8, Cells: 64) By Jim Aikin.
- Hand Shogi. Modern shogi variant with many pieces to drop. (9x9, Cells: 81) Author: Hans L. Bodlaender. Inventor: John William Brown.
- Hanga Roa. A chess variant inspired by the people of Easter Island. (9x9, Cells: 81) By Hernán Marcelo Domínguez Placencia and Juan Pablo Schweitzer Kirsinger.
- Hannibal Chess. Chess with added Modern Elephants (ferz-alfil compound) on 10x8 board. By Kevin Pacey.
- Hannibal Chess with Gryphon and Falcon. Expansion for hannibal chess. (10x9, Cells: 90) By Aurelian Florea.
- Hannibal Chess with Manticore and Falcon. Expansion for hannibal chess. (10x9, Cells: 90) By Aurelian Florea.
- Hans 38Special Chess. On a board with 38 squares. (6x6, Cells: 38) By Eric V. Greenwood.
- Hans 40 Gift Chess. Pieces are digits or letters and move like their form on 5 by 8 board. (5x8, Cells: 40) By Köksal Karakus.
- Hans37 Chess. Chess variant for four players on a board of 37 squares. (Cells: 37) By Ralph Betza.
- Hans38 Chess. Eric Greenwood's chess on a board with 38 squares. (6x6, Cells: 38) By Eric V. Greenwood.
- Hans38 Chess. A form of Chess with a Limited Supply of Squares; entry of the 38-challenge. (8x8, Cells: 38) By Ralph Betza.
- Hasami Shogi. Popular Japanese game, playable with Shogi set. (9x9, Cells: 81) Author: Katsutoshi Seki.
- Haunted Chess. Missing description (8x8, Cells: 64) By Stephane Burkhart.
- Haynie's Game of Leapers. On 8 by 8 board with several pieces that can jump. (8x8, Cells: 64) By Billy Haynie.
- Haynie's Great Chess. A decimal chess variant with Cardinals, Marshals Amazons, Nightriders Commoners, Firzans, Wazirs, Camels, And Zebras. (10x10, Cells: 100) By Billy Haynie.
- Haynie's Hexagonal Chess. Experimental hexagonal chess variant. (Cells: 91) Author: Hans L. Bodlaender. Inventor: Billy Haynie.
- Haynie's high power fairy chess 64. With orthodox chess set but different stronger movements for most pieces. (8x8, Cells: 64) By Billy Haynie.
- Haynie's Oblong Chess 128. Variant on double size chess board. (16x8, Cells: 128) Author: Hans L. Bodlaender. Inventor: Billy Haynie.
- Haynie's Primary Chess. On 6 by 6 board without knights. (6x6, Cells: 36) Author: Hans L. Bodlaender. Inventor: Billy Haynie.
- Heaven. Pieces trying to reach a goalfield can only move if in reach of a friendly piece. (Cells: 39) By Rob Nierse.
- Heavenly Queen Chess. Queen’s motion is changed slightly but enough to make it unique. (8x8, Cells: 64) By Lev Grigoriev.
- Heavy Chess. A high-density chess-variant-variant. By Jean-Louis Cazaux.
- Heavy Gravity Chess. Chess with heavy gravity, Knights can't jump, Queens, Bishops, and Rooks are limited to 4 spaces per move, Kings move 1 diagonal. (8x8, Cells: 64) By Gary K. Gifford.
- Heavy Shako. 10x10 variant inspired by Yangsi, made by Eric Silverman and Jean-Louis Cazaux. Author: A. M. DeWitt. Inventor: Eric Silverman and Jean-Louis Cazaux.
- Hecatomb. Each player has 31 queens and one king. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Kevin Maroney.
- Hecatomb promotion. Missing description (8x8, Cells: 64) By Daniil Frolov.
- Hectochess. 10x10 variant that can be played with 2 mismatched Chess sets. By A. M. DeWitt.
- Heian Shogi. or Early Shogi. A predecessor of Shogi. (9x8, Cells: 72)
- Heian Shogi . Part of a document describing various Historical Chess Variants. Author: Nader Daou.
- Heian-Dai Shogi. Early Great Shogi. (13x13, Cells: 169)
- Helmsman Chess. Introducing the Helmsman and the bounce-move, whereby the piece deviates orthogonally. A very positional piece (zrf available). By M Winther.
- Henry VIII Chess. This is a hybrid capture king-losing chess variant. (7x8, Cells: 56) By Rich Hutnik.
- Hepta. Hexagonal clan-based game played with Icehouse pieces. (Cells: 174) By Joost Aan de Brugh.
- Heraldic chess. Chess with cards and dice. Author: Hans L. Bodlaender. Inventor: Modest Solans.
- Heraldic Chess Games with Cards and Dice. Text of rule booklet of heraldic chess. By Modest Solans.
- Heraldic Extinction Chess. Win by taking a pair of pieces that started on the same line in the opening setup. (8x8, Cells: 64) By Hans L. Bodlaender.
- Herb garden chess. Variant on 7 by 12 board with additional combination pieces. (12x7, Cells: 84) By William Overington.
- Herd. Experimental variant with jumping pieces on 7 by 7 board. (7x7, Cells: 49) By Sergey Sirotkin.
- Herichess. A variant on a board in the shape of the English Heritage logo. (14x14, Cells: 112) By Charles Gilman.
- Hero and Superhero Chess. The King's Pawn is replaced by a Hero (moves like any other piece on your side on the board) or a Superhero (improved Hero). (8x8, Cells: 64) By Tomas Forsman.
- Hero's Chess. A chess with very different pieces. (8x8, Cells: 64) By (zzo38) A. Black.
- Heroes Hexagonal Chess. Hexagonal variant with special Hero piece which enhances other pieces. (Cells: 84) By Tony Quintanilla.
- Heroes Hexagonal Chess version 2. Updated version of Heroes Hexagonal Chess in 91 hexes. (Cells: 91) By Tony Quintanilla.
- Hex Besiege. Two slightly modified McCooey sets placed b(l)ack to b(l)ack. (11x21, Cells: 187) By Charles Gilman.
- Hex Dragonal Chess. Based on an idea by Jeremy Good this CV has horizontal rows of hexes and an unusual set of directions,. (13x13, Cells: 127) By Graeme C Neatham.
- Hex Frontofhouse. Captured hex pieces return with only their forward moves. (11x11, Cells: 91) By Charles Gilman.
- Hex Horngi. To hex cells what Mitregi is to square ones and Tunnelshogi to cubic ones. (Cells: 91) By Charles Gilman.
- Hex Shogi. A new family of hexagonal Shogi variants. By Fergus Duniho.
- Hex Shogi 41. Hexagonal shogivariant on board with 41 squares. (Cells: 41) By Fergus Duniho.
- Hex Shogi 81. A hexagonal Shogi variant on an 81-space board. (9x9, Cells: 81) By Fergus Duniho.
- Hex Shogi 91. A hexagonal Shogi variant on a 91-space board. (Cells: 91) By Fergus Duniho.
- Hex39. Hexagonal chess variant on small board with simple rules. (Cells: 39) By Torben Mogensen.
- Hexa Decimal. Larger hexagonal chess variant. (11x11, Cells: 90) By Joost aan de Brugh.
- Hexabeast. Hexagonal chess variant with six animal pieces, by Ivan A. Derzhanski. (Cells: 70) By Ivan Derzhanski.
- Hexagonal Chess, Glinski's. Chess on a board made out of hexagons. (Cells: 91) (Recognized!) Author: Hans L. Bodlaender. Inventor: Wladyslaw Glinski.
- Hexagonal Chess, Haynie's. Experimental hexagonal chess variant. (Cells: 91) Author: Hans L. Bodlaender. Inventor: Billy Haynie.
- Hexagonal chess, McCooey's. Chess on a board, made out of hexes. Variant of Dave McCooey. (Cells: 91) (Recognized!) Author: Hans L. Bodlaender. Inventor: Dave McCooey.
- Hexagonal Iss Jetan. Missing description (7x13, Cells: 127) By Larry L. Smith.
- Hexagonal Round Chess. Combined Byzantine Chess with Rex Chess. (9x9, Cells: 81) By Arnaldo Rodrigues D'Almeida.
- Hexapawn. Martin Gardner's miniature game of three pawns vs the pawns. (3x3, Cells: 9) Author: Robert Price. Inventor: Martin Gardner.
- HexCaïssa. Each player has four pieces on hexagonal board with disappearing squares. (Cells: 61) By Christian Freeling.
- Hexcetran Chess. Hexagonal variant starting from random setups. (Cells: 91) By Carlos Cetina.
- Hexchess. Another hexagonal chess variant with closer resemblance to orthodox chess. (Cells: 69) Author: Bill LaVanway.
- HexChess-Kirby's. Missing description (Cells: 313) By Steve Kirby.
- Hexes Chess . Link: Hexagonal Chess in 54 hexes, using orthodox pieces. Includes enhanced Pawn movement and castling. The board is elongated.&. By Mike Layfield.
- Hexes Compressed Chess . Link: This version of Hexagonal Chess has rotated cells so that the angles point up and down. By Mike Layfield.
- Hexetera. Small hexagonal variant with some elements of Chinese Chess. (Cells: 44) By Roberto Lavieri.
- Hexgi. A Wellisch-style hex interpretation of Shogi, with "officers" using selected orthogonals. (Cells: 91) By Charles Gilman.
- Hexiang Qi. Hexagonal Variant of Xiang Qi. (11x11, Cells: 91) By Robert Hancock.
- Hexmate. A two-player variant on a hex board made up of 127, 3-color hexagons. (Cells: 127) By Michael A. Rouse.
- Hexofen. 91-cell hexagonal variant with three knights and parallel pawn rows. Author: Daniil Frolov.
- Hia Chess. Smaller 9x8 variation of the Mongolian Hiashatar. (9x8, Cells: 72) By Jose Carrillo.
- Hiashatar . Mongolian Great Chess played on a 10x10 board with a pair of Bodyguard pieces per side. Author: L. U. Kisljuk.
- Hiashatar. A Mongolian historical variant, featuring the very special Bodyguard piece (zrf available). Author: M Winther.
- Hibryd I. Game played on 4x4 board with a King and four Pawns each, neutral pieces, multiple forms of capture and many ways of winning. (4x4, Cells: 16) By Jared B. McComb.
- Hibryd III. An exotic three-player variant played on a board of 42 hexes with multiple victory conditions. (Cells: 42) By Jared B. McComb.
- Hidden Random Chess. This is a two-player game that incorporates the element of chance in chess. By Prussia General.
- High Chess. Drawn games are instead won by the player whose King is closest to the centre. By Grant Sinclair.
- Highcastle Chess. All pieces can castle. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Ed Pegg Jr..
- Highlander Chess. Instead of taking, pieces can be challenged with dice; winning piece absorbs powers. (8x8, Cells: 64) Author: Peter E. Leyva and Hans L. Bodlaender. Inventor: Peter E. Leyva.
- Hindustani Chess. 19th century Indian game. (8x8, Cells: 64) Author: John Ayer. Inventor: _unknown.
- Hippodrome. Solitaire game using a small board. (4x4, Cells: 16) By Andy Lewicki.
- Hishigata Shogi. Variation of Maka-Dai-Dai Shogi (ultra large Shogi). (19x19, Cells: 361) By Sean Humby.
- Historia Ŝako. Historia Ŝako is a Chess variant incorporated between western and eastern variants, by track movement of Elephant and Queen. (8x8, Cells: 64) By Siwakorn Songrag.
- Historic chess variants . by Sam Trenholme.
- Historical Chess Variants . Part of a document describing various Historical Chess Variants. Author: Nader Daou.
- Hit and Run Chess. After the first move, players may move 1 piece twice or two pieces once, capturing only on any piece's first move. By Stephen Howell.
- Hit-point Chess. Pieces start with 30 hit points and attack by stepping next to the target. (8x8, Cells: 64) By (zzo38) A. Black.
- Hitchhiker Chess. Get your Hitchhiker to the Restaurant at the other End of the Board; inspired by Douglas Adams' books. (Cells: 42) By Dan Troyka.
- Hitpoint Chess 1. Pieces have hitpoints, like in a wargame. (8x8, Cells: 64) By Ralph Betza.
- HiveQueen. Missing description (Cells: 61) By Larry L. Smith.
- Hnefatafl - the Strategic Board Game of the Vikings . Detailed rules and history of a Chess-like game played for 100's of years in Northern Europe. Author: Sten Helmfrid.
- Hobbit Chess . Two variants, 8x8 and 9x9, using hobbits as superpawns. By C. George Boeree.
- Hobgoblin Chess. Inchworm crowd-forming magnetic mutating lunar-hallway exploding-Pawn Chess; an extreme game. (8x8, Cells: 64) Author: Jack Masters. Inventor: Simon Vertigo.
- Hockey Chess. Missing description (8x8, Cells: 64) By Chuck S Smith.
- Hole Chess. Variant on a board of 44 squares with two holes that pieces can be dragged into. (7x10, Cells: 44) By Gary K. Gifford.
- Holochess . Holographic chess-like game played in Star Wars movie. By Mike Kelley.
- Holywar. Variant with 6 by 6 board with four additional corner squares. (6x6, Cells: 40) By Fergus Duniho.
- Homo Scacco. Several games with pieces of same type and a royal amongst them. (8x8, Cells: 64) By Lev Grigoriev.
- Hoo Mitregi. Intermediate between Mitregi itself and Dai Mitregi. (12x12, Cells: 144) By Charles Gilman.
- Hook Shogi. 16x16 variant with the hook movers from the largest Shogi variants. (16x16, Cells: 256) By A. M. DeWitt.
- Hop Chess. The same as FIDE chess plus a special piece called the hopper. (8x8, Cells: 64) By João Pedro Neto.
- Hopgi. Small-board variant of Chessgi with an L-shaped board, linked pairs of Kings, where all pieces can move like a Mao-hoppers. (7x7, Cells: 43) By Peter Aronson.
- Hoplit Chess. Introducing the Hoplit, a very mobile modern relative of the Korean cannon, on an H-board (zrf available). By M Winther.
- Hoplomach Chess. Introducing the Hoplomach, a dynamic bifurcation cannon, related to the Korean cannon, on an H-board (zrf available). By M Winther.
- Hoppel-Poppel. Modest divergent variant where Knights capture like Bishops and Bishops capture like Knights. (8x8, Cells: 64) Author: Jörg Knappen.
- Hordes of Change. A chess variant inspired by Andernach Chess. (8x8, Cells: 64) By Joost aan de Brugh.
- Horizons. Game with 5 new pieces on 12x12 board. (12x12, Cells: 144) By Lev Grigoriev.
- Horn Rimmed Hex 1: 91 to 127. Start of hex analogue to the Mitred Framing series. (13x13, Cells: 127) By Charles Gilman.
- Horn Rimmed Hex 2: 61 to 91. Continuation of hex analogue to the Mitred Framing series. (11x11, Cells: 91) By Charles Gilman.
- Horseman's Chess. Game where pieces mount and dismount. By Frank MacCrory.
- Horus. Game with Royal Falcons where all pieces start off board and most captures return pieces to owner's hand. (7x7, Cells: 44) By Peter Aronson.
- Hostage Chess. Pieces taken are held hostage and can be exchanged against other pieces and then dropped. (8x8, Cells: 64) (Recognized!) By John Leslie.
- Hourglass Chess. 38-Square board in shape of Hourglass. (7x6, Cells: 38) By Uri Bruck.
- Hourglass Hex Chess. 2 overlapping triangles form a hex board of just over FIDE size. (9x9, Cells: 65) By Charles Gilman.
- House of Kay. Company selling a circular chess board. Author: Hans L. Bodlaender.
- 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. (8x8, Cells: 87) By Gary K. Gifford.
- Howitzer Chess. Introducing another piece named Howitzer, a fearful form of cannon, on the H-board. For the advanced tactician. With zrf. By M Winther.
- HP-minichess. Small chess variant that could be played against a pocket calculator. (5x5, Cells: 25) Author: Hans L. Bodlaender.
- https://www.omnichess.club/variant/bc6b6876-dbdc-419c-bba4-3e462. Missing description
- Hubbub. A variant of Bruhaha with more short-range pieces. (8x8, Cells: 72) By Greg Strong.
- Humpmitregi. Larger Shogi variant with more powerful diagonal pieces. (10x9, Cells: 90) By Charles Gilman.
- Humpty Dumpty Chess. Cannon-using variant inspired by history of the character Humpty Dumpty. (12x8, Cells: 96) By Charles Gilman.
- Hundred Acre Chess. Chess based on Winnie-the-Pooh. (10x10, Cells: 100) By Bob Greenwade.
- Hunterbeest. Large variant with one each of distinctive Nimrod pieces, and of similar set of oblique pieces. (11x10, Cells: 110) By Charles Gilman.
- Huntsman Chess. Missing description (9x9, Cells: 80) By Yu Ren Dong.
- Hybrids. Standard pieces combine and split. (8x8, Cells: 64)
- HyperModern Shatranj. Missing description (8x8, Cells: 64) By Joe Joyce.
- Hyperspace Chess. When moving more than one square, pieces travel some turns in hyperspace before arriving at their destination. (8x8, Cells: 64) By João Pedro Neto.
- Hypnotic Chess. You may move opposing pieces your pieces attack. (8x8, Cells: 64) By Dan Troyka.
- I'm a Wazir, Get Me Out of Here. A variant in which pieces disappear if left too long in the wrong place. (8x8, Cells: 64) By Charles Gilman.
- I-Chess. Large board variant that adds two more piece types: the wolf and the eagle. Author: Aurelian Florea. Inventor: Paul Zamă.
- IAGO Chess System. http://abstractgamers.org/wiki/iago-chess. (8x8, Cells: 64) By Rich Hutnik.
- Ibu Ibu Chess. Introduces the concept of a King's entourage, making King powerful and protected. (8x8, Cells: 64) Author: Jeremy Gabriel Good. Inventor: Jeremy Gabriel Good.
- ICBM Chess. I(inter)-C(hess)B(oard) M(issle) Chess, where you can throw a piece to capture as well as make normal moves. (8x8, Cells: 64) By Eric Driscoll.
- Ice Age Chess. Every 20th move, the board freezes and ice cubes appear on almost every empty square. (8x8, Cells: 64) By Köksal Karakus.
- Ice Hockey Chess. Chess variant based upon rules of (Ice) Hockey. (8x10, Cells: 68) By Francois Tremblay.
- Icehouse . Set of pyramids you can play several games with, including Martian chess.
- iChess. Missing description (8x8, Cells: 64) By Pangus Ho.
- Idaidakama Shogi. Like Maka-Dai-Dai with drops and new pieces. (19x19, Cells: 361) By (zzo38) A. Black.
- Ideal Chess. A social game that melds FIDE chess with playing cards. (8x8, Cells: 64) By Graeme C Neatham.
- If regular octogonal chess would be possible?. Missing description (8x8, Cells: 64) By Daniil Frolov.
- Illusionary Piece Chess. A piece and a Pawn on each side are more powerful, but can not offer check or prevent bare King. (8x8, Cells: 64) By Peter Aronson.
- Imitating Chess. Pieces move as the last moved piece. By Sergey Sirotkin.
- Immobilizer Shogi. Piece that can immobilize other pieces. (9x9, Cells: 81) By (zzo38) A. Black.
- ImmortalStarMasters. Multiplayer, hexagonal board for chess and checker games. Author: Ronald D. Planesi.
- Imperial Chess. Large variant with new pieces and victory by capture of royal pieces. (12x12, Cells: 144) By James Killian Spratt.
- Imperial Dragon Chess. A variant of Xiangqi designed to appeal to western players. (9x10, Cells: 90) Author: Peter Aronson. Inventor: Paul Fredrix.
- Imperial Hex Chess. Smaller hexagonal variant with new pieces. (Cells: 75) By Robert Hancock.
- Imposter Chess . Exchange captured pieces in order to move Kings in different ways. Author: Laila W. Stefan and Andrew Newman. Inventor: Laila W. Stefan.
- In The Bin. Chess on a 9x9 board. Players select pieces from a bin. (9x9, Cells: 81) By Darren Izzard.
- Inchworm and Longworm Chess. Pieces move their heads to a new square, then move their tail to that square on a later move. (8x8, Cells: 64) By Ralph Betza.
- Indistinguishable Chess. Player pieces indistinguishable from each other. Board squares are indistinguishable. (8x8, Cells: 64) By Gary K. Gifford.
- Inertia Chess. Pieces continue to move in the same direction. Author: João Pedro Neto. Inventor: Claude Chaunier.
- Infantry Chess. Small chess variant with short range pieces. (9x9, Cells: 43) By Erez Schatz.
- Infima. Missing description By Johnny Luken.
- Infinite Board Chess. Imagine the board is an infinite grid. By Keith Douglas.
- Infinite Chess. Chess on on infinite board. Author: Hans L. Bodlaender. Inventor: Tim Converse.
- Infinite Chess. Extends Chess to larger, even infinite, boards. () By Tony Thomas.
- Infinite Recursion Chess. Another mega-chess type game. (2x(8x8), Cells: 128) By David Howe.
- Information on Chinese Chess playing cards. Missing description Author: Stephen Leary.
- Information on historic chess variants. Missing description
- Insane. Pieces change to random type when they move. With program playing this variant. Author: Hans L. Bodlaender. Inventor: Jari Huikari.
- Insane Flip Relay Shatranj. Missing description (10x10, Cells: 100) By Michael Nelson.
- Insect Chess. On a 12x12 board. All pieces are insect and arachnid representations, with some unique pieces. (12x12, Cells: 144) By Tim Bostick.
- Inside-out chess. With two kings per player and squares with a square inside. (6x6, Cells: 44) By Maarten Bodlaender.
- Insurrection. Capturing causes promotion, demotion, or a coup in the opponent's ranks. (8x8, Cells: 64) By Fogus.
- Interchange Chess. Get as many of your own pieces to their destination squares on the other side of the board as possible. (8x8, Cells: 64) Author: David Howe. Inventor: Alexandre Muñiz and David Howe.
- Interdependent Chess. A 42 square variant in which pieces borrow capturing ability from other pieces. (6x7, Cells: 42) By Fergus Duniho.
- InterGrid Chess. Pieces on corners and on centers of squares of 8 by 8 board. (8x8, Cells: 145) By David Howe.
- Interloper Chess. Introducing the Interloper, a highly invulnerable attacking piece (with zrf). By M Winther.
- International Contemporary Random Chess. Missing description (10x10, Cells: 100) By Jose Carrillo.
- International Fischer Random Chess. Missing description (10x10, Cells: 100) By Jose Carrillo.
- Interweave. Game with elements of Checkers and Ultima where all pieces are colorbound and only capture pieces on the other color. (8x8, Cells: 64) By Peter Aronson.
- Intrigue. Players each select a pawn which holds the king's secret position. By Nigel Chapman.
- Intrusive Squares. The board is split into 4 4x4 supersquares and reunited by 20 extra squares. (10x10, Cells: 84) By Charles Gilman.
- Invader Zim Chess. Chess based on the show, Invader Zim. (8x8, Cells: 64) By Zim .
- Invasion. A military inspired Chess variant played on an 84-squares board. (10x10, Cells: 84) By Jean-Louis Cazaux.
- Invisible King Chess. Opponent can't see where you moved your king to. (8x8, Cells: 64) By (zzo38) A. Black.
- IO Chess. Variant on 16 by 16 board with many pieces. (16x16, Cells: 256) By Mark Hedden.
- The Iron Knight. A number of variants with uncapturable pieces. (8x8, Cells: 64) By Ralph Betza.
- Irrational Chess. Chess game on an exotic board. (9x10, Cells: 66) By Max Koval.
- Irregular Quadrangle Chess. Chessboard of 96 quadrangles. (Cells: 96)
- Irwell. Gain an advantage by crowning your enemy. (8x10, Cells: 80) By Charles Gilman.
- Isis and Cam. Two variants based on ancient English universities and the rivers near them. (6x8, Cells: 48) By Charles Gilman.
- Iss Jetan. Missing description (10x10, Cells: 100) By Larry L. Smith.
- It's not a job for King. Two relatively modest games, playing with power and royality. (8x8, Cells: 64) By Daniil Frolov.
- Italian Progressive Chess. White moves once, black two times, white three times, etc. Check is only allowed at last move of series. (8x8, Cells: 64) Author: Alessandro Castelli.
- J-Chess. Variant on 10 by 8 board with jesters. (10x8, Cells: 80) By Daniel Brown.
- Jack-Be-Nimble Chess. Jumping pieces have to learn how before they jump tall pieces. (8x8, Cells: 64) By Ralph Betza.
- Jacks and Witches 84. Variant on 84 squares with special pieces and special squares. (12x8, Cells: 84) By Antoine Fourrière.
- Jai-Alai. A sports theme variant with three new pieces: the Superball, the Ball and the Diagball. (9x8, Cells: 72) By Roberto Lavieri.
- Janggi: Korean Chess. The variant of chess played in Korea. (9x10, Cells: 90) (Recognized!) Author: Fergus Duniho and Jean-Louis Cazaux.
- Janggidosa . Korean Chess Playing Program.
- Janus Chess. Variant on 10 by 8 board. (10x8, Cells: 80) (Recognized!) Author: Hans L. Bodlaender. Inventor: Werner Schoendorf.
- Janus Kamil Chess. A crossover between Janus Chess and Modern Kamil Chess. (12x8, Cells: 96) By Jörg Knappen.
- Japanese Chess. Missing description (9x9, Cells: 81) (Recognized!) Author: Hans L. Bodlaender and Fergus Duniho.
- Jedi Chess. Maharajah and the Sepoys modified with a Star Wars theme. (8x8, Cells: 64) By Dave Leigh.
- Jester Chess. The Jester is an 'anon' piece but similar to the 'Fool' - beautiful commercial wooden sets - a must have! Author: Simon Edward Jepps.
- Jester Chess. Large variant, with four new pieces including Jester that imitates opponents last type of move. (10x11, Cells: 110) Author: John William Brown. Inventor: Thomas Havel.
- Jetan - Martian Chess. Large variant from the book The Chessmen of Mars. (10x10, Cells: 100) Author: Jean-Louis Cazaux and Hans L. Bodlaender. Inventor: Edgar Rice Burroughs.
- Jetan Jeddara. Large Jetan variant, with new pieces. (16x12, Cells: 192) Author: Tony Quintanilla and James Killian Spratt. Inventor: James Killian Spratt.
- Jetan-Sarang . A large variation of Jetan. By James Killian Spratt.
- Jikaida. A large variant, taken from A Sword for Kregen by Kenneth Bulmer. (12x18, Cells: 361) Author: Alan Burt Akers. Inventor: Kenneth Bulmer.
- Jinn Chess. Pieces start off the board, and game is divided into a placement phase and a traditional play phase. (8x8, Cells: 64) By Gyozo Nagy.
- Joko Urtaroak. Modern large version of Game of Four Seasons; four player chess variant. (10x10, Cells: 84) By Glenn Overby II.
- Joshua's Chess. Missing description (12x12, Cells: 144) Author: Michael Nelson. Inventor: Joshua Nelson.
- Journalist's Chess. Journalist is movable to any position but no capture. (8x8, Cells: 64) By (zzo38) A. Black.
- Joust Chess. Rotating pieces, long range movement, adjacent capture, both in one turn using different directions. By Jeff Cornell.
- The Jovan Army. An army for Chess with Different Armies featuring heavy pieces that move forward slowly. By Ralph Betza.
- Judkin's Shogi. Small shogi variant on 6 by 6 board. (6x6, Cells: 36) Author: Hans L. Bodlaender. Inventor: ? Judkin.
- Juggernaut Chess. Roll a die each turn to determine the move of the all-capturing Juggernaut. Author: Seth McGinnis. Inventor: Erik Wilson.
- Jumping Chess. Pieces capture by jumping. Board has extra edge squares making it 10x10. (10x10, Cells: 100) By Peter Aronson.
- Jumping Knights Chess. Nightriders replace Knights and War Machines have also been added to Jumping Chess. (10x10, Cells: 100) By David Paulowich.
- The Jungle Game. Simulated conflict between animal kingdoms. (7x9, Cells: 63) Author: Hans L. Bodlaender and Jean-Louis Cazaux.
- Jungles and Mountains Chess. Chess with hindering terrain that must be removed to free up piece movement. (8x8, Cells: 64) By Gary K. Gifford.
- Jupiter. Huge chess variant on 16 by 16 board. (16x16, Cells: 256) By Adrian King.
- Jupiter (Revised). Missing description (16x16, Cells: 256) By Adrian King.
- Jurassic Chess. Dinosaur based chess variant played with regular chess pieces. (8x8, Cells: 64) Author: Arvind Pillai. Inventor: Tarun Gupta and Arvind Pillai.
- Jurassic Chess. Game with unusual movements, a river, and bridges. (9x9, Cells: 81) By Andrew Wong.
- Juxtaposition Chess. Pawns and Pieces switch places with pseudo-pieces throughout the game. (8x8, Cells: 64) By Gary K. Gifford.
- Kagamigi. Shogi variant featuring pieces biased toward the center. (9x9, Cells: 81) By Bob Greenwade.
- Kaissa . Decimal variant developed from descriptions in John Norman's Gor books. By Jeff Shaffer.
- Kamikaze Mortal Shogi. Send your Kamikazes on suicide missions in this Shogi variant. (9x9, Cells: 81) Author: Fergus Duniho. Inventor: Fergus Duniho and Roberto Lavieri.
- Kangaroo Chess. Row of kangaroos behind the pawns behind the pawns. (10x10, Cells: 100) By HaruN Y.
- Kaos: The Game . Multiplayer game on a 7x7 board. By Robert Peeples.
- Kar Ouk. A variation of Khmer Chess (.rar unix archive file). By Yu Ren Dong.
- Keeps and Moats Chess . A four player chess variant. Inventor: Matt Worden.
- Keltic Chess. Adapted orthochess on a 43-square, fidchell-inspired board. (9x7, Cells: 43) By David Jagger.
- Keyles. Large variant with special king capture rule. Variant of Quex. (10x10, Cells: 100) By Stephen Larson.
- Ki Shogi. Variant of Shogi played without a board, and pieces are cubes. By Larry L. Smith.
- Killer Chess. Taking is obligatory; the first player that loses all his pieces wins. (8x8, Cells: 64) (Recognized!) Author: Hans L. Bodlaender and Antoine Fourrière.
- Kilyow. Invented by Furugouri Akio(古郡章雄) in 1991. By Yu Ren Dong.
- King and Queen. Variant on cross-shaped board with 39 squares. (Cells: 39) By Dennis Xay Voong.
- King Friday XIII Chess. Flexible castling, promotion to opponent's pieces, etc. (8x8, Cells: 64) By (zzo38) A. Black.
- King of the Hill. In addition to regular rules, win by moving your King to a center square. (8x8, Cells: 64) Author: Johan Richter.
- King of the Hill. Be the first player to get your King to the top of the hill! (19x19) By Paul E. Newton.
- King of the Ladder Tournament Rules. Ideas for rules to mix variants together in one game. (8x8, Cells: 64) By Rich Hutnik.
- King to Bunker Leap. King can jump over own pieces to reach 1 of 2 bunker positions in Shuffle Chess or Pre-Chess. (8x8, Cells: 64) By Charles Daniel.
- King with a Shotgun. Twice each game, the King can make a non-moving Rook capture. (8x8, Cells: 64) By Adam Norberg.
- King's Color. Pieces move depending if they are on the same color squares as the king in hexagonal chess variant. (Cells: 91) Author: Hans L. Bodlaender. Inventor: Christian Freeling.
- King's Court. Variant on 8 by 12 board with Chancellors and Jesters. (12x8, Cells: 96) By Sidney LeVasseur.
- King's Guard Chess. Pawns move like kings and only Pawns may capture. (8x8, Cells: 64) By Graeme C Neatham.
- King's progressive chess. Players may make a number of moves in a turn, depending on row where king is on. (8x8, Cells: 64) By Sergey Sirotkin.
- King's Reincarnation. Captured Kings return to the board, but at a price. 2 versions of play. (8x8, Cells: 64) By Gary K. Gifford.
- King's Run. An entry for the 32-turn contest that is based on Logan's Run. By Fergus Duniho.
- King's speech. 360 random positions with the King always exposed and vulnerable. By Davor Vujacic.
- Kingchess. Players may drop groups of unplaced pieces instead of moving. (8x8, Cells: 64) By Jury Adonin.
- Kingdom Chess. Large variant with new pieces. (10x10, Cells: 100) By Konklav Anipsal.
- Kingdom of distorting mirrors. Missing description (2x(8x8), Cells: 128) By Daniil Frolov.
- Kinging shogi. Missing description (9x9, Cells: 81) By Daniil Frolov.
- Kinglet. Win by taking all the pawns of the opponent. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Vernon Rylands Parton.
- Kings. A modest variant with more than one king. (8x8, Cells: 64) By Abdul-Rahman Sibahi.
- Kings and Pawns. Proprietary game on 8 by 7 board with two types of pieces and no capturing. (7x8, Cells: 56) Author: Hans L. Bodlaender.
- Kings castle. Crack the castle - Lancer to the front. (9x9, Cells: 81) By Gerd P. Degens.
- Kings Court . Commercial chess variant on 12 by 8 board based on the historical Courier chess. By Sidney LeVasseur.
- Kingsmen. 9x9 board with two extra Bishops. Pieces gain the King's moveset upon reaching the last three ranks. By Albert Lee.
- KingSwap!. A solitaire swap puzzle to escort your lazy King. (5x5, Cells: 25) By Vincent Bugica.
- Kinzoku. Small variant for little ones, is based on Dobutsu but is very different from it. (3x5, Cells: 15) By Lev Grigoriev.
- Kira Chess/Kira Shogi. "Kira" and "L" pieces which is not known by your opponent. (8x8, Cells: 64) By (zzo38) A. Black.
- Klin Zha. Chesslike game played by Klingons from Star Trek on triangular board. (Cells: 81) Author: Jean-Louis Cazaux. Inventor: Leonard B. Loyd Jr..
- Klin Zha . The Authorized Klin Zha Homepage. Author: Kevin Geiselman. Inventor: Leonard B. Loyd Jr..
- Knavish Chess. Variant using square-board analogues to 6-way hex-board Dabbabas. (10x10, Cells: 100) By Charles Gilman.
- Knavish Shatranj. Shatranj with Knaves and Debtors. (8x8, Cells: 64) By Jörg Knappen.
- Knight Chase. Game played on with two Knights on a Chessboard with differing goals. (8x8, Cells: 64) Author: Jeff Rients. Inventor: Alex Randolph.
- Knight Court. Mate the knight with three pieces per player on a three by three board. (3x3, Cells: 9) By Jason D. Wittman.
- Knight Mare. A large variant with several promotion levels. (11x11, Cells: 120) By William C. Schmidt.
- Knight Scattering Chess. Knights can neither capture nor be captured, but instead can move opposing pieces a Knight's move away. (8x8, Cells: 64) By Sergey Sirotkin.
- Knight Shogi . Black player lacks two Lances, one Bishop, as well as one Rook; however, his Kinghts and Promoted-Kinghts could also move like K. By Yu Ren Dong.
- Knight-Relay Chess. Uncapturable Knights give other pieces the ability to move as Knights. (8x8, Cells: 64) Author: Alessandro Castelli. Inventor: Mannis Charosh.
- Knight-Riding Chess. Missing description (8x8, Cells: 64) By John Smith.
- Knight-Tac-Toe. Small variant with only kings and knights where you must get three pieces in line in the center of the board. (5x5, Cells: 25) By David Howe.
- Knightless symmetric chess. Missing description (9x9, Cells: 81) By Claudio Martins Jaguaribe.
- The Knightliest Black Hole. Knighted pieces on a constantly diminishing board. By João Pedro Neto.
- Knightmare Chess. The American version of Tempete sur l'Echiquier.
- Knightmate. Win by mating the knight. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Bruce Zimov.
- Knights of the Round Table. Missing description (8x8, Cells: 64) By Adam Goss.
- Knightsbridge. 14 knights against 14 knights on a 7 by 7 board. (7x7, Cells: 49) Author: David E. Smith.
- Knockoff Chess. Chess with pieces that push each other around and off the board. By Daniel Zacharias.
- Knot Chess. Board in shape of geometric knot.
- Kokusai Sannin Shogi. Three-handed Shogi variant. (Cells: 127) and George F. Hodges. Inventor: Tanigasaki Jisuke.
- Koopa Chess. Form of chess based on the Mario Brothers series of video games. (8x8, Cells: 64) Inventor: Ralph Betza.
- Korean Carrera. Missing description (15x10, Cells: 150) By Daniil Frolov.
- Korean Chess . An extensive description of Korean Chess. (9x10, Cells: 90) Author: Roleigh Martin.
- Korean Chess. Korean Chess: presentation plus a strong Zillions implementation. Author: M Winther.
- Korean Random Chess. A Korean Chess variation with a random setup and a few new rules. (9x10, Cells: 90) By Jose Carrillo.
- Korean Shogi. Shogi variant where pieces move like a friendly piece directly behind it. (9x9, Cells: 81)
- Kozeriai. A 5x7 variant of Shogi. (5x7, Cells: 35) By Jan Paerke.
- Kozune. Missing description (9x9, Cells: 81) By Joshua Morris.
- Kozune vs FIDE. Missing description By Daniil Frolov.
- Krieg. Two player game on a four-by-four board. Article. (4x4, Cells: 16) By Jeff Zeitlin.
- Kriegspiel. With help of a referee, two players move without knowing the moves of the opponent. (3x(8x8), Cells: 192) (Recognized!) Author: Hans L. Bodlaender. Inventor: Henry Michael Temple.
- Kristensen's Game. A conscious attempt to restructure Chess from 1948. (9x9, Cells: 81) Author: Peter Aronson. Inventor: Ejnar Kristensen.
- Kung Fu Chess . Simultaneous movement in chess variant as an action and thinking game. Author: Hans L. Bodlaender.
- Kung Fu Chess. On a 14x10 board, the pieces in this variant are based on Kung Fu martial arts styles of combat. (14x10, Cells: 140) By Tim Bostick.
- Kuniegit. Each player has two knights and two warriors on standard chess board. (8x8, Cells: 64) By Danny Purvis.
- Kuuzen Dai Shogi. Dai Shogi with different promotions, invented by Eric Silverman. (15x15, Cells: 225) Author: A. M. DeWitt. Inventor: Eric Silverman.
- Kylatori Sunset. Small variant combining replacement, custodian and coordination capture. (6x8, Cells: 48) By Tim Stiles.
- Kyoshogi . Variant of Shogi on a 10x10 board.
- Kyoto Shogi. Modern 5x5 Shogi variant where pieces promote and unpromote with every move. Author: Greg Strong.
- Kyoto Shogi and Hex Kyoto Shogi . Small shogi variants. (Link.).
- L Shaped Chess. 2 player variant with some elements of 4-player ones. (7x7, Cells: 45) By Charles Gilman.
- Ladder Chess. Chess variant on a `skewed' board with 40 squares. (Cells: 40) By Sergey Sirotkin.
- Ladder Shogi. Shogi variant on 10 by 10 board where pieces climb the social ladder by multiple promotions. (10x10, Cells: 100) By Mason Green.
- Ladon Chess. Introducing the Ladon, a short-range piece that can repel any other piece, and also capture this way (zrf available). By M Winther.
- Ladorean Chess - Shaco Ladorean. Variation on Capablanca's Chess. (10x8, Cells: 80) Author: Bernhard U. Hermes. Inventor: Fergus Duniho.
- Lag Chess. The last move made by your opponent is not known to you. (8x8, Cells: 64) By Ralph Betza.
- Lancelot. Missing description (8x8, Cells: 64) By Stan Druben.
- Lancers Chess. chess with lancer piece, lancers instead of knights. By JT K.
- Lao Tzu Chess. www.schemingmind.com. (8x8, Cells: 64) By John Kipling Lewis.
- Laquear Chess. Introducing the Laquear, that captures like a bishop, but moves by the collision method (zrf available). By M Winther.
- Large Nahbi Chess. Missing description (10x12, Cells: 120) By Uri Bruck.
- Large Variants in the Historic North European Style. Missing description () By Charles Gilman.
- Larger Wildeurasian variants. increasing the 2+2+1 piece groups from three to five or six. (12x12, Cells: 144) By Charles Gilman.
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