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Interactive diagrams. (Updated!) Diagrams that interactively show piece moves.[All Comments] [Add Comment or Rating]
💡📝H. G. Muller wrote on Fri, Sep 1, 2023 11:05 AM UTC in reply to H. G. Muller from Thu Aug 31 08:26 PM:

Perhaps it is a good idea to make a small extension to XBetza notation, to distinguish moves that must be subject to the effects specified by morph or captureMatrix, and those that will ignore these instructions. This could solve many cases where unusual effects are only limited to a subset of the moves. Such as in case of the Troll, which appears in many 'Cazaux variants': this has the move GHfmWfcF, but only the Pawn-like moves would allow it to promote when reaching last rank.

If in G'H'fmWfcF the quotes would mean the G and H components ignore the morph, then defining morph=* for the piece (implying normal promotion choice on reaching last rank) would allow implementation of the Troll without using any custom-made JavaScript.