Learn How to Spot a Mate in 3: Ruy Lopez Berlin Defense
This middlegame puzzle comes from the Ruy Lopez Berlin Defense and shows how active pieces can turn a material edge into a forced attack. Black’s queen and bishop coordinate against the white king, using checks, pins, and the open g-file to create a mating net. The key idea is that a seemingly loose attacking piece can still be powerful when it supports a forcing sequence and limits the defender’s options.