Anti-King Chess II, invented by Peter Aronson, is February's Recognized Chess Variant of the month. Try it out with a Java Applet. Play it by email with Game Courier, our free online PBM system..

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Omega Chess. Commercial chess variant on board with 104 squares. (10x10, Cells: 104) (Recognized!) Author: Hans L. Bodlaender. Inventor: Daniel Macdonald.

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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. (8x8, Cells: 64) 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. (Cells: 40) 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. (4x16, Cells: 64) Author: Andrew Juell.
Oblong Chess 1. Historic chess variant on 16 by 4 board - Setup 1. (4x16, Cells: 64) Author: Ed Friedlander.
Oblong Chess 2. Historic chess variant on 16 by 4 board - Setup 2. (4x16, Cells: 64) Author: Ed Friedlander.
Oblong Chess 3. Historic chess variant on 16 by 4 board - Setup 3. (4x16, Cells: 64) Author: Ed Friedlander.
Oblong Chess 4. Historic chess variant on 16 by 4 board - Setup 4. (4x16, Cells: 64) Author: Ed Friedlander.
Oblong Chess 44. Variant of Oblong Chess on board with 44 squares. (4x11, Cells: 44) By Erez Schatz.
Oblong Chess 44. (4x11, Cells: 44) Author: Jeff Rients. Inventor: Erez Schatz.
Oblong Chess 44 . (4x11, Cells: 44) By Erez Schatz.
Oblong Chess 5. Historic chess variant on 16 by 4 board - Setup 5. (4x16, Cells: 64) Author: Ed Friedlander.
Oblong Chess 6. Historic chess variant on 16 by 4 board - Setup 6. (4x16, Cells: 64) Author: Ed Friedlander.
Oblong Chess 7. Historic chess variant on 16 by 4 board - Setup 7. (4x16, Cells: 64) Author: Ed Friedlander.
Octa-Ashtapada. 8x8x8 variant with powerful armies and the potential for multiple royal pieces per side. (8x8x8, Cells: 512) 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.
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. (8x8, Cells: 64) 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 . (10x10, Cells: 100) Author: Michael Nelson. Inventor: Gary K. Gifford.
Odin's Rune Chess. (10x10, Cells: 100) By Gary K. Gifford.
Off Board Chess Pieces. Each side has off board pieces which can be used only once in a game. (8x8, Cells: 64) By Ronald Drinning.
OK Chess . After the first move, Pawns can advance any distance. (8x8, Cells: 64) Author: Gary Baydo. Inventor: Clifford Merry.
Omega chess . Commercial chess variant on board with 104 squares. (10x10, Cells: 104) Author: David Howe. Inventor: Daniel Macdonald.
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. (10x10, Cells: 104) (Recognized!) Author: Hans L. Bodlaender. Inventor: Daniel Macdonald.
Omega Chess. A review. (10x10, Cells: 104) Author: Ben Good. Inventor: Daniel Macdonald.
Omega Chess. Rules for commercial chess variant on board with 104 squares. (12x12, Cells: 104) By Daniel Macdonald.
Omega Chess. Commercial chess variant on board with 104 squares. (10x10, Cells: 104) Author: Ed Friedlander. Inventor: Daniel Macdonald.
Omega Chess. This preset for Omega Chess enforces the rules and spots check, checkmate, and stalemate. (12x12, Cells: 104) Author: Fergus Duniho. Inventor: Daniel Macdonald.
Omega Chess game. Moves of a game between chess grandmasters Alex Sherzer and Judith Polgar. (10x10, Cells: 104)
Omega Chess Review. (10x10, Cells: 104) Author: David Howe. Inventor: Daniel Macdonald.
Omega Chess Review. (10x10, Cells: 104) Author: Alex Sherzer. Inventor: Daniel Macdonald.
Omega Chess set Photos. (10x10, Cells: 104) Author: Hans L. Bodlaender. Inventor: Daniel Macdonald.
Omega Chess Tournament. Play by email tournament on Richard's PBEM server. (10x10, Cells: 104) Author: David Short. Inventor: Daniel Macdonald.
Omnigon. Photos and Review. (Cells: 37) Author: Ben Good. Inventor: Mike Flynn.
On Designing Good Chess Variants. Design goals and design principles for creating Chess variants. Author: Fergus Duniho.
One dimensional Chess Variants. A page detailing some one dimensional chess variants. Author: Hans L. Bodlaender.
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. (5x8, Cells: 42) 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. (Cells: 32) 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 . (8x8, Cells: 64) 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. (8x8, Cells: 64) Author: Ed Friedlander.
One-Eye Chess (Sighted). Kriegspiel variant where one side can see, but lacks both Knights, a Bishop and the Queen. (8x8, Cells: 64) Author: Ed Friedlander.
Online PGN Viewer . Webtool to visualize the moves of a chessgame in PGN notation.
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. (12x12, Cells: 144) Author: Marek14 . Inventor: Moses Snell-Feikema.
Open Chess. Large variant with few pawns. (12x12, Cells: 144) By Moses Snell-Feikema.
Operational Chess. Wargame inspired variant played on a wide board. (16x9, Cells: 144) 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. (17x11, Cells: 187) By Andy Thomas.
Opposition Chess. Variant on 43 square board with sliding parts. (7x7, Cells: 43) By Uri Bruck.
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). (10x10, Cells: 100) By Greg Strong.
Opulent Chess . Zillions file for Opulent Chess. (10x10, Cells: 100) By Greg Strong.
Origami Chess Set . Author: Joseph Wu.
Original Kriegspiel. With help of a referee, two players move without knowing the moves of the opponent (captured piece types revealed). (8x8, Cells: 64) Author: Ed Friedlander. Inventor: Henry Michael Temple.
Orphan. Moves like a piece that attacks it. Author: Ben Good. Inventor: David L. Brown.
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. (7x12, Cells: 84) By Glenn Overby II.
Outback Chess. New pieces on plus-shaped board. (10x10, Cells: 84) By Timothy R. Newton.
Outback Chess . New pieces on plus-shaped board. (10x10, Cells: 84) 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! (10x10, Cells: 84) 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. (8x8, Cells: 64) Author: Ed Friedlander.
Outrigger Chess. On 10 by 8 board, with several variants. (10x8, Cells: 80) By Ralph Betza.
OverKnight Chess. Pawns are replaced by Knights, which promote. (8x8, Cells: 64) By Paul DeWitte.
OverKnight Chess. Pawns are replaced by Knights, which promote. (8x8, Cells: 64) Author: Tony Quintanilla and Paul DeWitte. Inventor: Paul DeWitte.
OverKnight Chess. Pawns are replaced by Knights, which promote. (8x8, Cells: 64) Author: Ed Friedlander. Inventor: Paul DeWitte.
Overprotection Chess. If an attacked piece is more often defended than it is attacked, it gains extra powers. (8x8, Cells: 64) By Ralph Betza.

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31 Games listed	1 Desktop Publishing items listed
17 Zillions of Games files listed	2 Photograph pages listed
14 Java Programs listed	6 Play by mail items listed
1 News Items listed	1 Piececlopedia entries listed
1 Miscellaneous items listed	1 Craft items listed
4 Sample Games listed

Total items listed: 79

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