Ruy Lopez Cozio Defense Fork Puzzle (Rated 866): Win with a Fork — Decisive Material Gain

This middlegame puzzle is a classic example of a crushing fork that wins material by attacking two valuable targets at once. White’s knight is ideally placed to create a tactical refutation of Black’s loose coordination, especially around the king and back rank. The key idea is that a forcing check can drag the king onto a square where the knight’s follow-up wins the heavy piece immediately. In practical classical chess, these motifs often decide the game on the spot.