The article discusses new ideas related to how people make choices in games. It suggests that players make decisions based on what they think others will do, even if they might be wrong. This is called Conjectural Equilibrium. The researchers argue for a refined version of this idea, Rationalizable Conjectural Equilibrium, which shows how different levels of information can affect the outcome of a game. By using examples, they demonstrate how this concept works in practice and how the type of equilibrium depends on what players know about each other. This research helps us understand how beliefs and information play a crucial role in decision-making during games.