Ah, I understand.  I have used this when I had an attack position set up, but it required a first response from the opponent.  For me it usually goes badly, because the opponent has a plan and I just gave over the lead.  Usually when this happens I am forced into moves from some other part of the board that also destroys my plans. However, I have won great games with it and gained much material.

interesting.  like not exchanging, but letting the opponent do so.  gives you time and an opportunity to develop something else.

Would an example be like if you were trying to gain opposition and had like an extra pawn or something and the opponent had another pawn with one square in between facing each other. Would moving your pawn be a waiting move?