There is no
double-cross system. It was invented for
literary effect by
Robert Anton Wilson.
Fnord.
A way of using disinformation and strange loops to confuse and disorient an opponent. In simple terms, you feed your opponent a string of disinformation that relates to real information in such a way that if he takes it literally, it looks one way, but if he digs deeper, he sees the opposite, and if he digs even deeper, he sees it yet another way, and so on for as many levels as the disinformer can create and transmit to his opponent.