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The Chess Variant Pages

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H. G. Muller wrote on 2022-08-06 UTC

I am not sure that this is feasible. Alice Chess is basically a 3-dimensional variant (with 2 levels), where all pieces have two-leg moves where the seccond leg changes level, and which are lame or (locust-)capturing by their orthodox move in the first leg. But the code in the include file used by the wizard assumes 2-dimensional boards.

Of course you can map the 3d board onto a wider 2d board (16x8, or perhaps 18x8 to allow a dead zone in between the boards that even Knights cannot cross, deleting the squares in that guard zone from the board in the Pre-Game code). And then define all moves as 2-leg moves that have a (dx, dy) = (+-18, 0) leap as second leg. There is no way to describe that in Betza notation, so the Interactive Diagram could not be used to generate the legdefs array with move definitions. But you could of course write that by hand. Either from scratch, or by adapting the code generated for orthodox chess, adding a second leg to each move. E.g. the Bishop in orthodox Chess would have

1 99  1  1     3 // bishop(104)
1 99  1 -1     3
1 99 -1 -1     3
1 99 -1  1     3

and this would have to be changed to

2 99  1  1     3 // bishop(???)
   1 18  0     1 
2 99  1 -1     3
   1 18  0     1
2 99 -1 -1     3
   1 18  0     1
2 99 -1  1     3
   1 18  0     1
2 99  1  1     3
  1 -18  0     1
2 99  1 -1     3
  1 -18  0     1
2 99 -1 -1     3
  1 -18  0     1
2 99 -1  1     3
  1 -18  0     1

And you would have to determine the new starting index for Bishop in this array, and put it into the B and b function definitions instead of 104.

I am not sure whether this would have the desired effect for castlings and e.p. captures, though. (Or indeed how the latter are supposed to work in Alice Chess in the first place.)

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