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Chess variant engines and CECP (XBoard) protocol[Subject Thread] [Add Response]
H. G. Muller wrote on Wed, May 1, 2019 04:18 PM UTC:

Well, the U.S. is full of awesome places in itself. These national parks and forests are amazing. But indeed, trans-Atlantic travel is a pain.

And yes, the promotion suffix in this case would always need to be properly punctuated. This is one of the things I still have to fix in XBoard; as so far only the large Shogi variants taxed the alphabet so much that the punctuation had to be invoked, and promotion there is indicated by a '+'', I could so far ignore that problem. Except for the promotions to Buddhist Spirit / Teaching King because of 'contageon' in Maka Dai Dai Shogi. But I worked around that by using XBoards feature that allows defining a second 'nickname' ID for any piece (originally added to handle the frequently encountered non-compliant FENs for Xiangqi  that use N for H and B for E) to assign letters that otherwise were in very low demand as nickname to BS and TK, and have XBoard use the ninckname as promotion suffix when the real ID has punctuation.

Fairy-Max not supporting under-promotion, and only allowing promotion to the army's own superpiece, this problem so far did not occur in CwDA. I still have the feeling that this promotion to opponent piece types is an ugly solution to a non-existent problem, as the armies that supposedly would be disadvantaged by promotion to own pieces are already overly strong without that.