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Grande Acedrex
Ruleset: Alfonso X


See the game Grande Acedrex for more details.




Rules from Alfonso X's Libro de los Juegos.


These rules are given in the Libro de los Juegos of Alfonso X.


12x12 checkered board. Each player begins with 24 pieces with special moves: King (x1): Moves one space orthogonally or diagonally or may jump over one space forward orthogonally or diagonally on its first move; Aanca (x2): Moves diagonally one and one space orthogonally in the same direction, and may continue moving in that same direction any distance; Crocodile (x2): moves diagonally any distance; Giraffe (x2): moves two spaces diagonally and then one orthogonally in the same direction, jumping over any intervening pieces; Rhinoceros (x2): moves diagonally one space and then one orthogonally in the same directions, jumping over any intervening pieces, and then may continue along the diagonal in the same direction; Lion (x2); jumps orthogonally three spaces away. Rook (x2): moves any distance orthogonally; Pawns (12): move forward orthogonally one pace or diagonally one space to capture. When they reach the opposite edge of the board, they are promoted to the piece which began in that space. If this is the King's space, it is promoted to Aanca. The opening position is for white: Rook, Lion, Rhinoceros, Giraffe, Crocodile, Aanca, King, Crocodile, Giraffe, Rhinoceros, Lion, Rook. This is mirrored for black so that the kings face each other. The pawns begin on the fourth row. Pieces are captured when a piece lands on a space occupied by the opposing player. The goal is to checkmate the King. When the King can be captured on the opponent's next turn, it is in check. The player must remove the King from check on their next turn. If the King cannot move out of check, it is checkmated and the opponent wins.


Browse all concepts for Alfonso X here.


Libro de los Juegos 81-83.

Other Rulesets

Described rulesets
Dice Dice determine the piece to be moved.



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