Learn How to Mate in 1: Queen Sacrifice
This middlegame puzzle comes from the Queen's Gambit Accepted, Central Variation, and it shows how a well-placed queen and bishop can create an immediate mating net against an exposed king. Even when one side is down material, king safety can outweigh everything else. The key idea is to recognize when the enemy king has no escape squares and the final attack is supported by pieces already aimed at the king zone.