Defensive Move Intermediate Puzzle (Rated 1149): Win the Bishop — Endgame Refutation

This chess endgame is a classic example of a tactical refutation in a simplified position. White’s king can step in and win the loose bishop, turning a losing material balance into a decisive practical advantage. The key idea is that in the endgame, king activity matters as much as pawn structure, and an undefended piece can be punished immediately. Even when both kings are centralized, the side with the more active king and the cleaner tactical shot often takes control.