Nimzo Indian Defense Leningrad Variation Puzzle (Rated 871): Win Material — Chess Endgame Fork

This chess endgame puzzle shows how a single active knight can create a decisive material gain by attacking two targets at once. White’s piece activity is superior, and the black rook is vulnerable because it is poorly placed and tied to the king’s safety. In classical chess, forks often appear when the enemy king and a valuable piece sit on aligned squares. The key idea is to use forcing moves to win material, not to chase a direct attack.