Learn How to Spot a Mate in 2: Discovered Check
This middlegame puzzle comes from the Queen's Gambit Declined Exchange Variation and shows how a discovered check can create a forced mating net. White has a huge material edge, but the real lesson is tactical: when the king is exposed and your pieces coordinate on the same lines, a forcing move can turn a winning position into immediate mate. The key idea is that one piece can give check while uncovering another attacker, creating a double threat the defender cannot meet.