Triangular Chess, gameboard and init config

Triangular chess is a

chess variant A chess variant is a game related to, derived from, or inspired by chess. Such variants can differ from chess in many different ways. "International" or "Western" chess itself is one of a family of games which have related origins and could be co ...

for two players invented by

George R. Dekle Sr. George Robert "Bob" Dekle Sr. (born May 23, 1948) is an American lawyer who was an Assistant State Attorney in Florida's Third Judicial Circuit from 1975 through 2005. During this time, he served as lead prosecuting attorney in the 1980 Orlando ...

in 1986. The game is played on a

hexagon In geometry, a hexagon (from Ancient Greek, Greek , , meaning "six", and , , meaning "corner, angle") is a six-sided polygon. The total of the internal angles of any simple polygon, simple (non-self-intersecting) hexagon is 720°. Regular hexa ...

-shaped

gameboard Board games are tabletop games that typically use . These pieces are moved or placed on a pre-marked board (playing surface) and often include elements of table, card, role-playing, and miniatures games as well. Many board games feature a comp ...

comprising 96

triangular A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices ''A'', ''B'', and ''C'' is denoted \triangle ABC. In Euclidean geometry, any three points, when non- collinea ...

cells. Each player commands a full set of

chess pieces A chess piece, or chessman, is a game piece that is placed on a chessboard to play the game of chess. It can be either white or black, and it can be one of six types: king, queen, rook, bishop, knight, or pawn. Chess sets generally come with si ...

in addition to three extra pawns and a unicorn The unicorn is a legendary creature that has been described since antiquity as a beast with a single large, pointed, spiraling horn projecting from its forehead. In European literature and art, the unicorn has for the last thousand years o ...
. Triangular chess and its variation tri-chess were included in ''World Game Review'' No. 10 edited by Michael Keller.

Game rules

The starting setup is as shown. As in

chess Chess is a board game for two players, called White and Black, each controlling an army of chess pieces in their color, with the objective to checkmate the opponent's king. It is sometimes called international chess or Western chess to disti ...

White White is the lightest color and is achromatic (having no hue). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully reflect and scatter all the visible wavelengths of light. White on ...

moves first, and the object is

checkmate Checkmate (often shortened to mate) is any game position in chess and other chess-like games in which a player's king is in check (threatened with ) and there is no possible escape. Checkmating the opponent wins the game. In chess, the king is ...

. Other standard conventions apply as well, including

castling Castling is a move in chess. It consists of moving the king two squares toward a rook on the same and then moving the rook to the square that the king passed over. Castling is permitted only if neither the king nor the rook has previously moved ...

, the pawn's initial two-step move, the ''

en passant ''En passant'' (, "in passing") is a method of capturing in chess that occurs when a pawn captures a horizontally adjacent enemy pawn that has just made an initial two-square advance. The capturing pawn moves to the square that the enemy paw ...

'' capture, and

promotion Promotion may refer to: Marketing * Promotion (marketing), one of the four marketing mix elements, comprising any type of marketing communication used to inform or persuade target audiences of the relative merits of a product, service, brand or i ...

at the last . The triangular geometry, however, implies special move patterns for the pieces.

Piece moves

* A rook moves in a straight line starting through a cell edge. (Three directions are possible.) * A bishop moves in a straight line starting through a cell vertex Vertex, vertices or vertexes may refer to: Science and technology Mathematics and computer science *Vertex (geometry), a point where two or more curves, lines, or edges meet *Vertex (computer graphics), a data structure that describes the position ...
. (Three directions.) * The queen moves as a rook or bishop. (Six directions.) * The king moves one step as a queen. When castling, the king slides two cells if (0-0); three cells if (0-0-0). * A knight moves in the pattern: two steps as a bishop, then one step as a rook in an

orthogonal In mathematics, orthogonality is the generalization of the geometric notion of ''perpendicularity''. By extension, orthogonality is also used to refer to the separation of specific features of a system. The term also has specialized meanings in ...

direction. A knight leaps any intervening men. * The unicorn moves in the pattern: two steps as a rook, then one step as a rook in an orthogonal direction. Like a knight, the unicorn leaps any intervening men. * A pawn moves straight forward one step at a time, whether crossing a cell edge or vertex. On its first move it may optionally move two steps straight forward. A pawn captures to either cell adjoining the cell immediately in front, in the same rank. * If a pawn reaches a board edge where no step straight forward exists, the pawn continues to advance toward promotion using its capture move (whether there are men to capture or not).

Tri-chess

Tri-chess is a variation of triangular chess created by Dekle in the same year. 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. * A bishop moves in six directions constituting board diagonals. * A rook moves in six directions along horizontal ranks or oblique files. * The queen moves as a rook or bishop. (Twelve directions.) * The king moves one step as a bishop or two steps as a rook.

Notes

References

Bibliography * * *

External links

Triangular Chess
simple programs by Ed Friedlander (

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