Learn How to Spot Back Rank Mate: X-Ray Attack
This chess puzzle is a classic example of a back rank mate idea in a practical middlegame-to-endgame setting. The key tactical feature is the x-ray attack: a major piece lines up through another piece to create a forcing sequence against the king. Even though material is already imbalanced, the side to move can turn defense into a mating net by using checks and captures in the right order. The position rewards calculation over material counting.