Sapolsky's 2023 argument against free will. Difficult, rigorous, and one of the most widely-discussed neuroscience books of the year.
From Wikipedia
In game theory, a strictly determined game is a game where the optimal strategy for each player does not depend on the strategy chosen by the other players. In such a game, a single outcome represents the most rational choice for both players, meaning neither can improve their result by unilaterally changing their move. This stable outcome is called a saddlepoint.