Learn How to Exploit a Pin: Discovered Attack
This puzzle is a classic middlegame example of tactical coordination where a pin and discovered attack work together to win material. The key idea is that one piece can be forced to move or be exchanged, opening a line for another attacker to hit a more valuable target. In positions like this, the side to move often has a forcing sequence that turns active piece placement into a decisive material gain, even when the board looks balanced at first glance.