Learn How to Win Material: Discovered Attack
This middlegame puzzle is a classic example of a discovered attack combined with a pin and a hanging piece. White’s active rook on the e-file creates tactical pressure because moving it can uncover a stronger attack on a loose target. The key idea is that one piece can serve two purposes at once: it can be the attacker and the blocker. When the blocker moves, the hidden threat becomes decisive, and the opponent’s coordination collapses.