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The Chess Variant Pages

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Fergus Duniho wrote on 2021-08-09 UTC

Contrary to what was documented, the rlink command was not available. Maybe I accidentally used Ctrl-z too many times. So, I added it back in. I also fixed a bug in link that stopped it from working after the first pair.

I expanded the power of the map command. It was previously useful only for creating logical directions from leaps defined in terms of ranks and files. This limited it to the directions available on a simple grid. To make it easier to create directions for boards with unusual geometries, it can now be used with previously created logical directions. In the Cylindrical Chess preset I'm working on, I used link and rlink to add connections between the a and h files for east and west, and then I used map to define the diagonal and hippogonal directions without handwriting them link by link. The code looks like this:

map n 0 1 s 0 -1 w -1 0 e 1 0; // Orthogonal directions
link w (a1 h1) (a2 h2) (a3 h3) (a4 h4) (a5 h5) (a6 h6) (a7 h7) (a8 h8);
rlink e (a1 h1) (a2 h2) (a3 h3) (a4 h4) (a5 h5) (a6 h6) (a7 h7) (a8 h8);
map nw (n w) ne (n e) sw (s w) se (s e);
map nne (n ne) nnw (n nw) sse (s se) ssw (s sw);
map nee (ne e) nww (nw w) sww (sw w) see (se e);

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