Sightlines problem

[David McCullough Dobson]

I think my original suggestion still works:

1) If you fire at an empty space that's visible, but you'd potentially hit
an invisible guy on the way, you hit the empty space.

2) If you fire at a guy who's visible, but you'd potentially hit an
invisible guy on the way, you hit the invisible guy.

I think that covers most such situations, is easy to program, and fair and
easy to comprehend for the grognards.

Dave