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H. G. Muller wrote on Wed, Jul 6, 2022 08:29 AM UTC in reply to Aurelian Florea from 07:09 AM:

Ah, sorry. I thought you wanted to allow both kinds of Pawns to promote to each other. But you want to exclude it. (Why would you want that, btw? It would be a nice tactical twist if it was allowed.)

I am afraid that BadZone cannot be used to veto promotions, because it does not get the promotion piece passed as a parameter. I wonder if it is worth it to implement some general solution for this problem, which can be summarized as that you want to allow the promoting pieces to refrain from promoting on some ranks, but you don't want to allow them to promote to each other. Adding their types to the possible promotion choices for that rank then would not work. It would be nice if a special symbol like 'self' could be added to the set of choices to indicate the type of the moving piece. I will think about it.

And you are right about the other thing: the AI of the Diagram appears to ignore the promotion restrictions.


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