Sure, although it's difficult to find a piece you can't mate a bare king with in this game (only knights I think, and even then the enemy king doesn't seem to avoid being forced to walk into mate). But what I'm talking about is a situation where you start down so much material that a draw is really the best you can hope for, which happens more often than not on the highest difficulty setting currently. That would be fine if threefold repetition resulted in a draw like in regular chess, as there are lots of times a perpetual check or threat to win material that forces repetition can be engineered against the computer at such a level even though mate can't really be. But, as is, it's kind of annoying to put the opposing king in perpetual check and then just be stuck in an infinite loop which you lose if you break.