Dice chess
Encyclopedia
Dice chess can refer to a number of chess variant
Chess variant
A chess variant is a game related to, derived from or inspired by chess. The difference from chess might include one or more of the following:...

s in which dice are used to alter gameplay; specifically that the moves available to each player are determined by rolling a pair of ordinary six-sided dice
Dice
A die is a small throwable object with multiple resting positions, used for generating random numbers...

. There are many different variations of this form of dice chess. One of them is described here.

Rules

The players alternate rolling the dice and, if possible, moving. On each of the dice, the one represents a pawn
Pawn (chess)
The pawn is the most numerous and weakest piece in the game of chess, historically representing infantry, or more particularly armed peasants or pikemen. Each player begins the game with eight pawns, one on each square of the rank immediately in front of the other pieces...

, two a knight
Knight (chess)
The knight is a piece in the game of chess, representing a knight . It is normally represented by a horse's head and neck. Each player starts with two knights, which begin on the row closest to the player, one square from the corner...

, three a bishop
Bishop (chess)
A bishop is a piece in the board game of chess. Each player begins the game with two bishops. One starts between the king's knight and the king, the other between the queen's knight and the queen...

, four a rook
Rook (chess)
A rook is a piece in the strategy board game of chess. Formerly the piece was called the castle, tower, marquess, rector, and comes...

, five a queen
Queen (chess)
The queen is the most powerful piece in the game of chess, able to move any number of squares vertically, horizontally, or diagonally. Each player starts the game with one queen, placed in the middle of the first rank next to the king. With the chessboard oriented correctly, the white queen starts...

, and six a king
King (chess)
In chess, the king is the most important piece. The object of the game is to trap the opponent's king so that its escape is not possible . If a player's king is threatened with capture, it is said to be in check, and the player must remove the threat of capture on the next move. If this cannot be...

. The player may move either of the pieces indicated on the two dice. For example, a player rolling a one and a two may move either a pawn or a knight. A player who rolls doubles (the same number on both dice) may play any legal move. Otherwise, standard chess
Chess
Chess is a two-player board game played on a chessboard, a square-checkered board with 64 squares arranged in an eight-by-eight grid. It is one of the world's most popular games, played by millions of people worldwide at home, in clubs, online, by correspondence, and in tournaments.Each player...

 rules apply, with these exceptions:
  • a player who has no legal move with either of the pieces indicated by the dice loses that turn (passed turn);
  • if castling
    Castling
    Castling is a special move in the game of chess involving the king and either of the original rooks of the same color. It is the only move in chess in which a player moves two pieces at the same time. Castling consists of moving the king two squares towards a rook on the player's first rank, then...

     is otherwise legal, a player may castle upon rolling a four, six, or doubles;
  • an en passant
    En passant
    En passant is a move in the board game of chess . It is a special pawn capture which can occur immediately after a player moves a pawn two squares forward from its starting position, and an enemy pawn could have captured it had it moved only one square forward...

     capture of a pawn is possible only if the player rolls a one, or doubles, immediately once the opportunity for the en passant capture arises;
  • a player who is in check can only play a legal response to that check (capturing the checking piece, moving the king, or interposing a piece);
  • a player who is in check but does not make a roll allowing a legal response to the check loses that turn, but does not automatically lose the game;
  • except in the unlikely event that the game ends in a draw
    Draw (chess)
    In chess, a draw is when a game ends in a tie. It is one of the possible outcomes of a game, along with a win for White and a win for Black . Usually, in tournaments a draw is worth a half point to each player, while a win is worth one point to the victor and none to the loser.For the most part,...

     pursuant to the standard rules of chess
    Rules of chess
    The rules of chess are rules governing the play of the game of chess. While the exact origins of chess are unclear, modern rules first took form during the Middle Ages. The rules continued to be slightly modified until the early 19th century, when they reached essentially their current form. The...

    , the game ends when one player either checkmate
    Checkmate
    Checkmate is a situation in chess in which one player's king is threatened with capture and there is no way to meet that threat. Or, simply put, the king is under direct attack and cannot avoid being captured...

    s the opponent or captures the opponent's king.

Sample game

Here is a sample game of dice chess. White rolls doubles, allowing her to play any move, and selects 1.e4. Black rolls a two and a three; no bishop move being possible, he plays 1...Nc6. White rolls a three and a four, and plays 2.Bc4. Black rolls a four and a five; since no queen move is possible, he must play the only legal rook move, 2...Rb8. White rolls a three and a six, and plays 3.Bxf7+. Black rolls a two and a four; since no knight or rook move is a legal response to the check, he must pass. (Only a six, or doubles, would have allowed him to move.) White rolls a two and a four, and chooses 4.Nh3. (A three or five would have enabled an immediate win with 4.Bxe8, 4.Qf3# or 4.Qh5#). Black rolls a one and a three; again, this does not allow a legal response to the check, so he must pass. White rolls a two and a four, and plays 5.Ng5#. (See final position at right.)

Variants on these rules

There is no standard set of rules for Dice Chess, and so games called 'Dice Chess' may have different rules to the ones given here.

For example, in the version of 'dice chess' given on the BrainKing site:
  • The players roll only one die.
  • Pawns may move from the seventh to the eighth rank on any roll, but may promote only to the piece shown on the die (a one allows a pawn to promote to any piece).
  • There is no check or checkmate. Rather, the goal is to actually capture the king.

BrainKing also provides a variant on 10x10 board with three kings on each side. To win you need to capture all enemy kings. All other rules are the same as for 8x8 version. The intention of adding two more kings is to reduce the elements of chance in the game.

Another form of dice chess is "Vegas Fun Chess", whose rules are described here. That site also indicates that "Pritchard's Encyclopedia of Chess Variants contains descriptions of seven versions of what he calls 'Dice Chess'."

John Gollon, in his book Chess Variations: Ancient, Regional, and Modern, notes three ways in which dice may be used in connection with a game of chess. The most common is similar to that described in the preceding sections. A second way to use dice is to have each player roll one die on each turn, with the number rolled indicating the number of moves to be played. The maximum number of moves that can be played is usually four, so a roll of a four, five, or six allows the player to make four moves. A third form of the game uses two dice of contrasting colors, with one determining the piece that can move, and the other the number of moves that the piece makes.

History

Anne Sunnucks
Anne Sunnucks
Patricia Anne Sunnucks is an author and the several time British Women's Chess Champion .Although she learned how to play chess at age 8, she did not play seriously until age 21 when she joined the same chess club as Imre König, who became her tutor...

writes that there is evidence from the literature of the period that dice were used to play chess in Europe between the 11th and 14th centuries, and even earlier in Burma and India. The dice were thrown before each turn to determine the piece to be moved; the same numbering system as set forth above was used (1=pawn, 2=knight, etc.). In the Burmese form of the game, three dice were thrown and each player made three moves at a time.
Vladimir Pribylinec writes that the cubes in the Cubic chess are moving as in orthochess by a symbol uppermost it is described in both editions of Pritchard´ Encyclopedia of Chess Variants, first time published in 1977-th. In the variant Protheus cubes are turned on the adjacent squares.
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