This deceptive tactic makes use of the fact that are you allowed to move to spaces that would be illegal in regular chess play. For example, just because a piece is sitting inbetween you and a square, doesn't mean you can't attempt to move there. After all, since the game takes place in real time, who is to say if the piece will still be obstructing you by the time you reach it? This allows you to disguise your moves for powerful discovered attacks. You can even move through enemy pieces, anticipating that they will move them before you reach the spot, for truly unexpected play.