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I did some more debugging this evening. I fixed a bug, reported by Antoine,
that allowed a piece to capture another piece of its own color. I also
fixed a bug in my Polish notation calculator that caused it to ignore
checks from Knights. I spent the past hour or so entering moves from a
game between Captain Smith and Philidor. The entire game played through,
and I caught the Knight bug while trying to make illegal moves on
occasion. At the end, I tested the checkmated King's moves, and none were
allowed. One was because it couldn't capture a piece on the same side,
and the rest were because it couldn't move into check. I also tried
moving another piece, but the King remained in check, so the move wasn't
allowed.

The one remaining bug that I know of has to do with being able to enter
illegal moves by entering multiple moves with semicolons or by entering
commands. This has to do with what kind of entry data is allowed and not
with the preset per se. If I included an option for restricting entry
data, I could stop the entry of illegal moves. But for now at least, I am
going to consider this bug acceptible. The preset is good enough to keep
you from making illegal moves by mistake. It just won't prevent you from
deliberately making some kinds of illegal moves. But on those occasions
when you did deliberately make an illegal move, it would be obvious to
your opponent that your move wasn't well-formed.

Other than that, it seems to be in full working order. Try it out and let
me know if you find anything amiss.