This happens very rarely, but has ruined at least one game for me when it removed an ace I was trying to move! Happens infrequently enough not to ruin my enjoyment of this great game, but often enough to bug me. I've had a very brief look at the code in the process of recompiling it with hollow hearts and diamonds for better B/W readability, but I haven't looked closely enough to have any clue what's going wrong here.