 The Formal Rule is often described as an essential aspect of the dialogical framework, and rightly so. It is, for example, one of the most salient differences between the dialogical approach and Hintikka’s Game-Theoretical Semantics. Contrary to the other rules, the Formal Rule is not “anonymous”: it does not apply equally to both players since it puts a restriction on the moves the proponent is allowed to play. Thus, the opponent is not concerned by exactly the same rules as the proponent.