Learn How to Win Material: Discovered Attack
This middlegame puzzle is a classic example of a discovered attack turning into a forcing tactical sequence. One piece is already lined up on a key target, but it is blocked by a more active piece in front of it. When that blocker moves with tempo, it reveals a direct threat against the enemy king and also creates a second tactical idea on the back line. These double-purpose moves are common in classical chess and often decide games instantly.