Comment 20 for bug 988138

http://git.gnome.org/browse/gnome-games/commit/iagno/src?id=e9e8ae3e5b573cba9f535b5dceaf7bf98eabd126

I guess I should check to see if the errors exist prior to this commit. Looks like a port and a major rewrite.
Just offhand, one thing is the undo history seems to assume a move occurs.
That might explain undo prob in last comment? Anyway. Ports do create bugs.