Starts with the letter 'C'
- Castalia Chess. Introducing the Castalia, which moves like a queen but cannot capture. Instead it can magnetically dislocate pieces (zrf exists). By M Winther.
- Catastrophic 8x8 Chess. Mathematician Missoum gives a new type of chessboard.
- Chesquerque. Variant played on a quadruple Alquerque board. (9x9, Cells: 81) Author: Peter Aronson. Inventor: George Dekle.
- Chess 68. 8 x 8 board with 4 extra corner squares, two extra piece types. (8x8, Cells: 68)
- Chess 69. Variant on modified chessboard with 69 squares. By Gerd Degens.
- Chess Cubed on Steam. Chess on a Puzzle Cube with standard pieces and rotations. By Ethan W.
- Chess Cubic. Chess board is a cube with each side a 4x4 grid. (4x4x6, Cells: 96) By Robert J. Bell.
- Chess for Three. Traditional pieces, three players, on a triangular board. By James Killian Spratt.
- Chess for Three. Three-player Chess with standard pieces and moves. Inventor: Jacek Filek.
- Chess in a Klein bottle. 8 by 14 board with sides glued together. (8x14, Cells: 112) By Alberto Monteiro.
- Chess in a Moebius Strip. 8 by 14 board with sides glued together. (8x14, Cells: 112) By Alberto Monteiro.
- Chess in a Toroidal Board. 8 by 14 board with sides glued together. (8x14, Cells: 112) By Alberto Monteiro.
- Chess on a board with 37 squares. Game with full Chess arrays minus a Pawn on a 37 square board without any corners. (Cells: 37) Author: Alfred Pfeiffer and Hans L. Bodlaender. Inventor: Alfred Pfeiffer.
- Chess on a Cylindrical Board. 8 by 14 board in with sides glued together. (8x14, Cells: 112) By Alberto Monteiro.
- Chess on a Soccer Ball. Missing description (Cells: 32) By David Cannon.
- A Chess-like Variant Construction Set. Build your own army and territory. By David Howe.
- Chess-like Variant Construction Set. Critique. Author: John William Brown. Inventor: David Howe.
- Chess37. A chess variant on a board with 37 squares where pieces outside of the center 9 squares move like Kings. (Cells: 37) By David Howe.
- CHESSAGON. CHESSAGON® is like traditional Chess, but with Triangles, with one new additional piece named the Duke. By Kerry Langford.
- Chessopoly. Board with a hole in the middle where pawns move clockwise. (12x12, Cells: 128) By Ralph Betza.
- Chessquarters. Variants obtained by rearranging the quarters of the chessboard. (Cells: 64) By Robert J. Bell.
- Chestria. Each player has 11 randomly selected pieces in this game of placement and flipping. (5x5x3, Cells: 43) By Jared B. McComb.
- Choiss. First place your squares, then your pawns, then your pieces, then move. Author: Ben M Reiniger. Inventor: Peter A. Victor.
- Christmas Tree Chess. Missing description (11x11x6, Cells: 126) By Daniil Frolov.
- Circular Perspective Chess. Pieces must travel through a central point to get to the opponent's side of the board.
- Citadel. Simple chess variant from early 20th century on 45 degrees turned board. (8x8, Cells: 64) By Karen Robinson.
- Clash of Command. Chesslike game with pieces that change and leave behind other pieces on special board. (Cells: 41)
- Color Chess. Four player chess variant on 11 by 11 board. (In Hungarian). By Sándor Nagy.
- Columbiad Chess.. Introducing the Columbiad, combining a cannon and a Cannonrider, on an H-board (zrf exists). By M Winther.
- Commedia dell'Arte Chess. A Pawnless variant with themed pieces on a 10x10 board with 5 square groups of 4 cells removed. (10x10, Cells: 80) By Charles Gilman.
- Constable Chess. Introducing the Constable piece on an H-shaped board. A game for attacking players. With zrf. By M Winther.
- Crazy 38's. On strange board with 38 squares. (Cells: 38) (Recognized!) By Ben Good.
- Crooked Board Chess. Variant on a board of standard size but odd shape. (8x12, Cells: 64) By Charles Gilman.
- Cross Chess. Game played on a cross-shaped board. (Cells: 64) Author: Peter Aronson. Inventor: Leigh Miller and N. Maddox.
- Crossbishop Chess. Introducing the Crossbishop piece, with interesting cannon capabilities (Zillions file downloadable). By M Winther.
- Crossover Chess. Two player variant with crossshaped board. (12x12, Cells: 64) By Robert J. Bell.
- Crossrook Chess. Introducing the Crossrook, a versatile piece with cannon capabilities (Zillions file downloadable). By M Winther.
- Crosstunnel. A cross between Tunnelchess and Fivequarters. (8x8x4, Cells: 196) By Charles Gilman.
- Cube Chess. Chess board is a cube with 4 playable sides, each with a 4x4 grid. (4x4x4, Cells: 64) By Robert J. Bell.
- Cube+. Three dimensional chess variant with 38 squares. (3x4x3, Cells: 38) By Jim Aikin.
- Cube-Surface Board Chesses. Missing description (8x8x6, Cells: 384) By Kuyan Judith.
Total items listed: 41