Reti Opening Fork Puzzle (Rated 861): Win with a Fork — Decisive Material Gain

This middlegame puzzle is a classic example of a tactical refutation built around a fork and king safety. White’s pieces are coordinated to exploit a loose black king and overloaded defenders, turning a previously active attack into a winning combination. The key idea is that forcing checks can create immediate tactical pressure, especially when the opponent’s pieces are tied up and one strong square becomes available for a knight. In practical classical chess, these motifs often decide the game before any endgame is reached.