Learn How to Win Material: Discovered Attack
This puzzle is a classic middlegame tactical refutation where a pinned piece and loose king-side defenses create a decisive material win. The key idea is to notice that one defender is overloaded and that a hidden line can be opened to attack a valuable target. In positions like this, the strongest move is often not a direct check, but a forcing capture that improves the tactical geometry and exposes a second weakness at the same time.