Learn How to Spot: Mate in 2
This puzzle is a classic tactical refutation in a sharp middlegame-to-endgame transition. White’s active pieces coordinate to exploit a loose back rank and an exposed black king. The key idea is forcing play: a checking move creates a reply that blocks the king’s escape, allowing a second check to finish the game. In chess endgame puzzles like this, activity matters more than material count, and the best move often turns defense into a mating net.