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Hi Joe

Fwiw there are two player equal army chess variants I've seen with each side having the K & Q switched in the setup position so as to be each opposite to the other side's Q & K respectively, so at least the idea would not be without precedent. I don't yet see that holding a lone enemy king on just 1 of the 4 4D board coordinates would suffice to work on its own, in order to be able to force a mate (say with just 1 Q). Perhaps the superior side's king needs to be allowed to further extend the hold onto 2 (or later even possibly 3) coordinates, if the lone king can be forced onto a cell from where it can be held by one more coordinate (once held on just 1 4D board coordinate), except I don't yet see how the lone king can be thus done in by force.

My suggestion that I wrote of earlier at least would not have the two K's already in a hold situation if using the current setup position, since one of the types of holds I suggested adding would be the Column & rank coordinates (i.e. I was careful not to say 'file' instead of rank); the other type of hold I suggested adding was Row & file. Still, the 2 kings (if my suggestion were adopted as it was) would not be too far from one being able to hold the other, by at least one of the kings advancing rank by rank while still staying on the same Column as each others' position in the existing setup. In this sense my suggestion made me a little uncomfortable. In another sense it did as well, in that it is something of a considerable 'kludge'. Hope you can make use of the suggestion somehow after all, even if the idea is indeed to be modified.