Parry's theorem

Parry's Theorem, primarily in the realm of number theory and combinatorial game theory, deals with the concept of winning strategies in certain games. Essentially, it establishes conditions under which players can ensure victory regardless of their opponent's moves. The theorem highlights that specific configurations or initial conditions can lead to predictable outcomes, enabling a player to formulate optimal strategies. In simpler terms, it shows how understanding the rules and structure of a game allows one to control the outcome effectively, making it a useful principle in strategic planning and decision-making.