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For interested developers, here is a link to the include file I used with
this preset:

/play/pbm/includes/chess2.txt

This is an alternative to the include file I already used for Chess. It
also enforces the rules of Chess, but it does it in a way that is easier
for developers to adapt to other games. Take a look at this preset in Edit
mode to see what the accompanying code looks like.

For this particular game, I chose to begin the ranks with 0. This seemed
appropriate, because it gives the usual Chess pieces all their usual
coordinates, and it also made it a little bit easier to adapt the
chess2.txt include file for use with this game.