Gràcies a @pickover he conegut una variant dels escacs unidimensionals. Havia vist a un llibre de Martin Gardner els escacs sobre una sola columna 1×8 Però aquí veig escacs circulars monodimensionals: Almost One-dimensional Chess Variants, amb 20 caselles, i on la primer i última estan connectades.
Regles:
- The King moves and takes one field in any direction.
- The Rook moves and takes by going as many squares as wanted in a direction without passing an occupied square.
- The Bishop moves and takes somewhat similar to the rook, but it stays on squares of the same color, and can jump across squares of a different color. Thus, the bishop always moves an even number of squares, and when doing so, each second square passed by must be empty, but the odd squares passed by can possibly be occupied.
- The Knight moves and takes by going exactly two fields. It can jump over the first field.
- The Pawn moves and takes only forward on one field.
Em sembla que és útil per aprendre els fonaments dels escacs!
A la mateixa pàgina web hi ha d’altres exemples curiosos d’escacs quasi-unidimensionals. També s’hi parla d’escacs de moebius… em pregunto què passaria si hi haguéssin desviaments, com l’exemple del símbol del dòlar, proposat al mateix post.