I have to say that I find these small stubby pieces very offputing as they all seem to look the same.One's concentration should be on the game and not trying to differintiate between the pieces.I played a guest last night and he gave up after 22 or 3 moves as black when I wasnt particularly dominating the game,asked for a return as white.I was in in a reasonably strong position when "Game Over you lost" came up.Do we have the right of an explanation for this.?Maybe I moved a wrong piece.Or are you allowed to make an illegal move without being told.If we were told how we lost or the imminent mate pointed out we might learn from our mistakes which surely is what it is about.