Learn How to Spot: Back Rank Mate
This middlegame puzzle comes from the Indian Defense and shows how king safety can decide a game instantly. Even when material is balanced, a vulnerable king and cramped piece placement can create a forced finish. Here, the key idea is a classic mating pattern: the enemy king has very limited escape squares, while its own pieces and pawns help restrict flight. In classical chess, these tactical refutations often appear after a quiet-looking position becomes overloaded.