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H. G. Muller wrote on Thu, Nov 4, 2021 10:24 AM UTC:

Ah, I did not really look at the Diagram, just at the preset. You can just add the fourth group to the shufflespecs array, as another triplet. You have to put one piece (e.g. Bishop) in the first element of the triplet, and all the others in the second.

I took your Diagram definition from the page source of your article, and pasted it into the Play-Test Applet to generate GAME code. Indeed it turned out that the two groups for which you wanted symmetric shuffling were not put into the shufflespecs array. The reason appears to be that you put the colon (:) to request symmetric shuffling on all pieces of the group. The GAME-code generation apparently cannot handle that. And I never noticed that, because I tend to mark all the pieces but one with a colon. The last piece then must be placed symmetrically as well, as the only open spaces that are left will be symmetrically positioned. If I removed the colon on one of the pieces in each group in the Diagram's shuffle parameter

      shuffle=:B:N:EF,QUT,DI,:LY

then the GAME code gets properly generated:

set shufflespecs (
  (F) // shuffleset
  (B N E) // symmetrized
   0
  (Q T U) // shuffleset
   0
   0
  (D I) // shuffleset
   0
   0
  (Y) // shuffleset
  (L) // symmetrized
   0
   0 // mirror to get black
);

(beware the Diagram uses other piece IDs than your preset!). I will fix the JavaScript for GAME-code generation in the Play-Test Applet such that it can also handle the case where all pieces in a shuffle group have a colon prefix. (As the Diagram itself doesn't seem to have any trouble with that.)


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