You are on the backup site for Chessvariants.com. Any posts, moves, or other changes you make here will not be permanent, because the pages and database from the main site will be backed up here every midnight EST. Additionally, things may not be working right, because this site is also a testbed for newer system software. So, if you are not here to test, develop, or merely read this site, you may want to change .org to .com in the navigation bar and go to the main site.



The Chess Variant Pages



This page is written by the game's inventor, Bruce Mills.

Diamond Chess

This variant of chess is played on a diamond-shaped board with 40 squares. It was designed for the competition to design a chess variant for a 40-square board.

The Board

The board and initial setup of the pieces is as shown below.

                +---+
                | K |
            +---+---+---+
            | A | N | V |
        +---+---+---+---+---+
        | P | P | R | P | P |
    +---+---+---+---+---+---+---+
    |   |   |   | P |   |   |   |
+---+---+---+---+---+---+---+---+---+
|   |   |   |   |###|   |   |   |   |
+---+---+---+---+---+---+---+---+---+
    |   |   |   | p |   |   |   |
    +---+---+---+---+---+---+---+
        | p | p | r | p | p |
        +---+---+---+---+---+
            | a | n | v |
            +---+---+---+
                | k |
                +---+

The board is a diamond-shaped board, with one square missing from the middle. This missing square is the Lake, and is an impediment to movement similar to the edge of the board.

The Pieces

Each player gets one King (K), one Knight (N), one Rook (R), one Archbishop (A), one Vizier (V) and five Pawns (P).

The King, Knight and Rook move in the same manner as their FIDE Chess equivalents.

The Archbishop has the combined moves of a FIDE Bishop and a FIDE King.

                +---+
                |   |
            +---+---+---+
            |   |   | * |
        +---+---+---+---+---+
        |   |   | * |   |   |
    +---+---+---+---+---+---+---+
    | * | * | * |   |   |   |   |
+---+---+---+---+---+---+---+---+---+
|   | * | A | * |###|   |   |   |   |
+---+---+---+---+---+---+---+---+---+
    | * | * | * |   |   |   |   |
    +---+---+---+---+---+---+---+
        |   |   | * |   |   |
        +---+---+---+---+---+
            |   |   | * |
            +---+---+---+
                |   |
                +---+

The Vizier has the combined moves of a FIDE Rook and a FIDE King.

                +---+
                |   |
            +---+---+---+
            | * |   |   |
        +---+---+---+---+---+
        |   | * |   |   |   |
    +---+---+---+---+---+---+---+
    |   | * | * | * |   |   |   |
+---+---+---+---+---+---+---+---+---+
| * | * | * | V |###|   |   |   |   |
+---+---+---+---+---+---+---+---+---+
    |   | * | * | * |   |   |   |
    +---+---+---+---+---+---+---+
        |   | * |   |   |   |
        +---+---+---+---+---+
            | * |   |   |
            +---+---+---+
                |   |
                +---+

Pawns move and capture like their FIDE equivalents with the following exceptions:

The following diagram shows more clearly the squares on which a White pawn (moving upwards) can move sideways instead of forwards. These squares are marked with "X", and the direction in which they can move is indicated with "<" and ">". A pawn blocked by the Lake can move in either direction. The squares on which white pawns promote is indicated by "*". Note that a pawn can never promote on the starting square of the opponent's King, because it will need to cross another promotion square to reach the King's square.

                +---+
                |   |
            +---+---+---+
            | * | * | * |
        +---+---+---+---+---+
        | X>|   | * |   |<X |
    +---+---+---+---+---+---+---+
    | X>|   |   |   |   |   |<X |
+---+---+---+---+---+---+---+---+---+
| X>|   |   |   |###|   |   |   |<X |
+---+---+---+---+---+---+---+---+---+
    |   |   |   |<X>|   |   |   |
    +---+---+---+---+---+---+---+
        |   |   |   |   |   |
        +---+---+---+---+---+
            |   |   |   |
            +---+---+---+
                |   |
                +---+

Other Rules

There is no castling.

All other rules are as in FIDE Chess.


Written by: Bruce Mills. This game is an entry in the 40-Square Variant Contest.


WWW page created: October 13, 1999.