Triangular chess gameboard and starting position
Triangular chess gameboard and starting position

Triangular chess is a chess variant for two players invented by George R. Dekle Sr. in 1986.[1][2] The game is played on a hexagon-shaped gameboard comprising 96 triangular cells. Each player commands a full set of chess pieces in addition to three extra pawns and a unicorn.

Triangular chess and its variation tri-chess were included in World Game Review No. 10 edited by Michael Keller.[3][non-primary source needed]

Game rules

The starting setup is as shown. As in chess, White moves first and the object is checkmate. Other standard conventions apply as well, including castling, a pawn's initial two-step option, en passant, and promotion at the last rank. But the triangular geometry implies special move patterns for the pieces.

Piece moves


For the three-player variant by Dekle, see Tri-Chess.

For three-player chess variants in general, see Three-player chess.

Tri-Chess is a variation of triangular chess created by Dekle in the same year.[4][2] The game is for two players and is the same as triangular chess in all respects except the moves of the bishop, rook, queen, and king are increased.

The bishop moves along cells in the diagram colored dark gray.
The rook moves along cells in the diagram colored light gray.
The Tri-Chess king moves one step as a bishop (dark gray cells) or two steps as a rook (light gray cells).

See also


  1. ^ The notation system used identifies each cell by its horizontal rank (letter) and the intersection of two oblique files (two numbers).


  1. ^ Pritchard (1994), pp. 321–22
  2. ^ a b Pritchard (2007), p. 213
  3. ^ Keller (1991)
  4. ^ Pritchard (1994), p. 323