For your second question, of course, a grandmaster can only tell you why they <i>think</i> they made the move. It may be a postrationalization for the fact that they feel, based on deep learning they have acquired over years of practice, that that move is the right one to make.<p>It doesn&#x27;t seem too difficult to have an AI let you know which other strong moves it rejected, and to dig into its forecasts for how those moves play out compared to the chosen move to tell you why it makes particular scenarios more likely. But that would just be postrationalization too...