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Starts with the letter 'O'
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• Omega Chess. Commercial chess variant on board with 104 squares. (Recognized!) Author: Hans L. Bodlaender.

• O/R Chess - Overloader/Restorer chess. A cochess variant. Author: Alessandro Castelli.
• Objective Bastardo. Cut-throat four-player variant where each player has a secret objective. Author: Ed Friedlander.
• Oblique. Variant with board with 40 squares turned 45 degrees. (Cells: 40) By Tony Quintanilla.
• Oblique . Variant with board with 40 squares turned 45 degrees. By Tony Quintanilla.
• Oblong chess. Variant of Shatranj, played on a four by sixteen sized board. (4x16, Cells: 64) Author: Hans L. Bodlaender.
• Oblong chess . Variant of Shatranj, played on a four by sixteen sized board. Author: Andrew Juell.
• Oblong Chess 1. Historic chess variant on 16 by 4 board - Setup 1. Author: Ed Friedlander.
• Oblong Chess 2. Historic chess variant on 16 by 4 board - Setup 2. Author: Ed Friedlander.
• Oblong Chess 3. Historic chess variant on 16 by 4 board - Setup 3. Author: Ed Friedlander.
• Oblong Chess 4. Historic chess variant on 16 by 4 board - Setup 4. Author: Ed Friedlander.
• Oblong Chess 44. Variant of Oblong Chess on board with 44 squares. (4x11, Cells: 44) By Erez Schatz.
• Oblong Chess 44. Based on the original oriental variant "Oblong Chess", a 16X4 Shataranj variant, but reducing the number of lines. Author: Jeff Rients. Inventor: Erez Schatz.
• Oblong Chess 44 . Missing description By Erez Schatz.
• Oblong Chess 5. Historic chess variant on 16 by 4 board - Setup 5. Author: Ed Friedlander.
• Oblong Chess 6. Historic chess variant on 16 by 4 board - Setup 6. Author: Ed Friedlander.
• Oblong Chess 7. Historic chess variant on 16 by 4 board - Setup 7. Author: Ed Friedlander.
• Oblong Shatranj with Die. Missing description Author: M Winther.
• ObstructionChess. A new chess variant designed to challenge old strategies and improve your chess play with logical and organic obstructions. (8x8, Cells: 64) By martin rinab.
• Octa-Ashtapada. 8x8x8 variant with powerful armies and the potential for multiple royal pieces per side. By Larry L. Smith.
• Octahedral Chess. 3d-board in octahedral form. (x9, Cells: 340) Author: Hans L. Bodlaender and Michael D. Ward. Inventor: Michael D. Ward.
• OctHex 146. Arranging the geometry of Tetrahedral Chess into an octahedron. (Cells: 146) By Charles Gilman.
• Octogonal Chess. Carrera Chess on an octogon-shaped board. (10x10, Cells: 76) By John Smith.
• Octopus Chess. Features the crooked slider: the Octopus and the dual path Sorcerer Snake. (10x10, Cells: 100) By Charles Daniel.
• Octopus Chess. Featuring the Sorcerer Snake, the Ninja Pawn, the Wazir Knight, the Ferz Knight and the Octopus. By Charles Daniel.
• Octopus Chess . Featuring the Octopus, the Sorcerer Snake, the Ferz Knight, the Wazir Knight and the Ninja Pawns. By Charles Daniel.
• Odalisque Chess. Magnetic rotating three dimensional chess variant. (1x4x16, Cells: 64) By Robert J. Bell.
• Odds Chess . Ways of giving a weaker opponent better odds. Author: Roger Cooper.
• Odds Chess. Ways of giving a weaker opponent better odds. (8x8, Cells: 64) Author: Roger Cooper.
• Odin's Rune Chess. A game inspired by Carl Jung's concept of synchronicity, runes, and Nordic Mythology. (10x10, Cells: 100) By Gary K. Gifford.
• Odin's Rune Chess . Missing description Author: Michael Nelson. Inventor: Gary K. Gifford.
• Odin's Rune Chess. With pieces that were inspired by rune images and meanings.... By Gary K. Gifford.
• Off Board Chess Pieces. Die roll determines which type of piece is moved. By Ronald Drinning.
• Official Football Chess. Variant from the 1960's with pieces replaced by football players. (8x8, Cells: 64) Author: Hans L. Bodlaender.
• OK Chess . After the first move, Pawns can advance any distance. Author: Gary Baydo. Inventor: Clifford Merry.
• Omega chess . Commercial chess variant on board with 104 squares. Author: David Howe.
• Omega Chess. Players have many pieces that can only move in the direction they point at. (9x9, Cells: 81) Author: Carlos Cetina. Inventor: Gabriel Maura.
• Omega Chess. Commercial chess variant on board with 104 squares. (Recognized!) Author: Hans L. Bodlaender.
• Omega Chess. Missing description Author: Ben Good.
• Omega Chess. Rules for commercial chess variant on board with 104 squares. (12x12, Cells: 104)
• Omega Chess. Commercial chess variant on board with 104 squares. Author: Ed Friedlander.
• Omega Chess. This preset for Omega Chess enforces the rules and spots check, checkmate, and stalemate. Author: Fergus Duniho.
• Omega Chess Extended . Missing description By Mykola Dolgalov.
• Omega Chess game. Moves of a game between chess grandmasters Alex Sherzer and Judith Polgar.
• Omega Chess Review. Missing description Author: David Howe.
• Omega Chess Review. Missing description Author: Alex Sherzer.
• Omega Chess set Photos. Missing description Author: Hans L. Bodlaender.
• Omega Transplant. The Champion and Wizard from Omega Chess are transplanted to the board system and rules used for Birds and Ninjas. By Charles Daniel.
• Omega Transplant . The Warmachine Alfil , the Camel Ferz, the Ninja Pawns and the usual suspects battle it out on a new chessboard. By Charles Daniel.
• Omnigon. Photos and Review. Author: Ben Good. Inventor: Mike Flynn.
• On Designing Good Chess Variants. Design goals and design principles for creating Chess variants. Author: Fergus Duniho.
• Once More, with Deans. Subvariants of River-with-university-and-cathedral series with extra piece type. By Charles Gilman.
• One dimensional Chess Variants. A page detailing some one dimensional chess variants. Author: Hans L. Bodlaender.
• One King Shogi. Checkmate the neutral king. (9x9, Cells: 81) By Daniil Frolov.
• One or Two. Make a normal move, or denote two pieces for which your opponent chooses how they must be moved. (8x8, Cells: 64) By Ralph Betza.
• The One Ring. White wants to get the Ring to the far side and destroy it. (5x8, Cells: 42) By Robert Price.
• The One Ring . White wants to get the Ring to the far side and destroy it. By Robert Price.
• The One Ring 1. Sample Game #1. Author: Robert Price.
• The One Ring 2. Sample Game #2. Author: Robert Price.
• The One Ring 3. Sample Game #3. Author: Robert Price.
• One Ring Chess . Chess on a one-dimension ring board. By Larry L. Smith.
• One Ring Chess. One dimensional chess played on a ring-shaped board. (Cells: 32) By Larry L. Smith.
• One Way Chess . Missing description By Adrian Alvarez de la Campa.
• One-Eye Chess (Blind). Kriegspiel variant where one side can see, but lacks both Knights, a Bishop and the Queen. Author: Ed Friedlander.
• One-Eye Chess (Sighted). Kriegspiel variant where one side can see, but lacks both Knights, a Bishop and the Queen. Author: Ed Friedlander.
• Online PGN Viewer . JPBYCatt.
• OOmost Chess. All movement in this variant is a form of castling. (8x8, Cells: 64) By Ralph Betza.
• Open Chess . Large variant with few pawns. Author: Marek14 . Inventor: Moses Snell-Feikema.
• Open Chess. Large variant with few pawns. (12x12, Cells: 144) By Moses Snell-Feikema.
• Open King 4*4DChess. Four dimensional game with 48 pieces. (4x4x16, Cells: 256) By Kevin Pacey.
• Open King 5*4DChess. Four dimensional game with 74 pieces. (5x5x25, Cells: 625) By Kevin Pacey.
• Operational Chess. Wargame inspired variant played on a wide board. By Andy Thomas.
• Operational Chess 2. Large, wargame inspired variant with ranged pieces. (17x11, Cells: 187) By Andy Thomas.
• Operational Chess 2. Large, wargame inspired variant with ranged pieces. By Andy Thomas.
• Operations on Trafalgar Ocean. Missing description By Glenn Nicholls.
• Opposition Chess. Variant on 43 square board with sliding parts. (7x7, Cells: 43) By Uri Bruck.
• Optimized Chess - 8H x 10W. Missing description Author: Jeremy Gabriel Good. Inventor: Omega Man.
• Optimum design of a Chess variant. Missing description By Namik Zade.
• Option Chess. Missing description (8x8, Cells: 64) Author: (zzo38) A. Black. Inventor: Paul Bonham.
• Option-Suicide Chess. You can optionally destroy your own pieces. (8x8, Cells: 64) By (zzo38) A. Black.
• Opulent Chess. A derivative of Grand Chess with additional jumping pieces (Lion and Wizard). (10x10, Cells: 100) By Greg Strong.
• Opulent Chess. Play this derivative of Grand Chess with additional jumping pieces (Lion and Wizard). By Greg Strong.
• Opulent Chess . Zillions file for Opulent Chess. By Greg Strong.
• Opulent Lemurian Shatranj. Joe Joyce's Shaman and Hero pieces are now on a larger board. (10x10, Cells: 100) By David Paulowich.
• Opulent Lemurian Shatranj. Joe Joyce's Shaman and Hero pieces are on a large board. By David Paulowich.
• Origami Chess Set . Missing description Author: Joseph Wu.
• Original Kriegspiel. With help of a referee, two players move without knowing the moves of the opponent (captured piece types revealed). Author: Ed Friedlander. Inventor: Henry Michael Temple.
• Orphan. Moves like a piece that attacks it. Author: Ben Good. Inventor: David L. Brown.
• Orphic Chess. Before the King is dropped the pieces can only capture. A very tactical and fast variant. By M Winther.
• Orphic Chess (with Elks). Before the King is dropped the pieces can only capture. A very tactical and fast variant, with Elks. By M Winther.
• Orwell Chess. Three player variant themed on George Orwell's 1984. (7x12, Cells: 84) By Glenn Overby II.
• Orwell Chess . Three player variant themed on George Orwell's 1984. By Glenn Overby II.
• Óskar's 3dchess. Missing description (8x8x5, Cells: 320) By Hafsteinn Kjartansson.
• Óskar's 3dchess version 2. Missing description (8x8x5, Cells: 320) By Hafsteinn Kjartansson.
• Ouk Chatrang (Cambodian Chess) . Part of a document describing various Historical Chess Variants. Author: Nader Daou.
• Outback Chess. New pieces on plus-shaped board. (10x10, Cells: 84) By Timothy R. Newton.
• Outback Chess . New pieces on plus-shaped board. Author: Peter Aronson. Inventor: Timothy R. Newton.
• Outback Chess. Play this game with new pieces on plus-shaped board. Winner of the 84-square contest! Author: Tony Quintanilla and Timothy R. Newton. Inventor: Timothy R. Newton.
• Outer Space Chess. Space-themed game with hyperspace and regular space boards. (5x8x2, Cells: 43) By Nicholas Kuschinski.
• Outpost Chess. Win by occupying a designated square in enemy territory for one move. Author: Ed Friedlander.
• Outrigger Chess. On 10 by 8 board, with several variants. (10x8, Cells: 80) By Ralph Betza.
• Overkill Chess. Paired pieces are compounds of 2 FIDE elements, King's partner of all three. (8x8, Cells: 64) By Charles Gilman.
• Overkill Ecumenical Chess. Compounds of 2, 3, and all 4 Wildebeest Chess elements. (9x10, Cells: 90) By Charles Gilman.
• OverKnight Chess. Pawns are replaced by Knights, which promote. (8x8, Cells: 64)
• OverKnight Chess. Pawns are replaced by Knights, which promote. Author: Tony Quintanilla
• OverKnight Chess. Pawns are replaced by Knights, which promote. Author: Ed Friedlander.
• Overprotection Chess. If an attacked piece is more often defended than it is attacked, it gains extra powers. (8x8, Cells: 64) By Ralph Betza.
• Overyang. Variant using compounds of Yang Qi pieces. (11x13, Cells: 143) By Charles Gilman.
• Oxford History of Board Games. Describes board games from their ancient inception to the present day. Author: David Parlett.
• Oxybeles Chess. Introducing the exceptional Oxybeles piece, which can hurl pieces over its head, on a Gustavian board (zrf available). By M Winther.
• Oxybeles Chess. The Oxybeles can sling a piece to the farthest square in the movement direction (+zrf). By M Winther.

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Total items listed: 110