Sacrifice Puzzle (Rated 1406): Spot Mate in 3 — Pillsbury's Mate

This chess endgame puzzle is a classic example of a forcing mating net where activity matters more than material. White’s queen and rook coordinate to drive the enemy king into a boxed-in corner, and the key idea is a sacrifice that removes the defender and opens the final line. In practical classical chess, these patterns often appear when the king has limited escape squares and one precise check starts a forced sequence.