I know when i play chess, I like to use a secret move that nobody knows where I place my queen outside of the board behind the opponent's back row. If they end up moving their queen, their king is toast. But, of course, it is fair since all they have to do is not move their queen, right?
It's just like when an enemy team is using some of the many powerful races on the server (which is always). I know then that there are about 30 or so races that would be disadvantageous to use. It really is a great rule set with all of this strategic variety. Also, it is the reason I play here so often.