Pillsbury's Mate Puzzle (Rated 1123): Spot a Mate in 3 — Discovered Attack

This chess endgame puzzle is a classic example of a mating net built around an exposed king and a powerful discovered attack. White’s material edge looks overwhelming, but the king’s safety is the real story: once the attacking rook creates a forcing check, the defender is dragged into a narrow corridor where the bishop can join with decisive pressure. The position rewards pattern recognition, not calculation alone, and it shows how a seemingly safe king can become vulnerable in a simplified classical chess setting.