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Acedrex (Alfonso) DLP Game   

Period Medieval

Region Southern Europe, Western Europe

Category Board, War, Replacement, Checkmate, Chess


Acedrex is the word for Chess in Spain. This is the version given in the Libro de los Juegos of Alfonso X, from the thirteenth century.


8x8 board. The pieces move as follows: King (x1): one space in any direction' Queen (x1): moves one square diagonally. On its first move, the Queen may jump diagonally two squares. The Queen cannot capture when making this move. Bishop (x2): jumps exactly two squares diagonally; Knight (x2): moves one space orthogonally and then one space diagonally, jumping over the intervening spaces; Rook (x2): moves any distance orthogonally; Pawns (x8): move one square forward orthogonally or one square forward diagonally to capture. Pawns may move two squares on their first move, but only if there have been no captures yet in the game. When reaching the opposite edge of the board, pawns may be promoted to Queen if the Queen has already been taken. If the King can be captured on the opponent's next move, it is in check. The King must not be in check at the end of the player's turn. If this is impossible, it is checkmate, and the opponent wins.

Libro de los Juegos 1-5.



Ludeme Description

Acedrex (Alfonso).lud


Browse all concepts for Acedrex (Alfonso) here.


Murray 1913: 485-489.

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Golladay, S. M. n.d. Alfonso X’s Book of Games. Translated by Sonja Musser Golladay.

Murray, H. J. R. 1913. A History of Chess. London: Oxford University Press.



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