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H. G. Muller wrote on Sat, Jun 13, 2020 05:40 PM UTC:

You know what? I will add type-differentiated promotions to the Diagram as a standard feature. So you won't have to use any custom-supplied WeirdPromotion() routine for that. This is easy to do: I will allow suffixing any piece ID in the promoChoice string by a number. Which, when present, will be taken to mean the number of ranks (counted from the back) where it can promote. Pieces not suffixed like that will use the value given for promotionZone instead. So by writing in the Diagram definition 

holdingsType=1
promoZone=3
promoChoice=!P*N*B*R2*Q1

the pieces N, B, R and Q must be in the hand (where they get by being captured) to allow promotion to them, due to the asterisk. (The P has no asterisk, because it is not really a promotion, so nothing has to be available. It is just forbidden on the last rank because of the !.) But even when the piece is available, Q would only be allowed on the last rank, and R on the last 2 ranks. B and N can be chosen on rank 1-3, P only on 2 and 3.

[Edit] I have uploaded a version of the Diagram script that implements this now. A beneficial side effect is that it now does the correct highlighting in the piece table for the pieces that can be chosen. With WeirdPromotion you could reject some choices after they were made, but it did not have any effect on the prior highlighting. It can be tested in the Gross Chess diagram.


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