Learn How to Spot Mate in 2: Back Rank Mate
This puzzle is a classic middlegame mating pattern where the attacking side uses a forcing check to drive the enemy king onto a vulnerable rank. The key idea is that the defender is overloaded and cannot cover every entry square at once. Once the king is restricted, a rook-based finish becomes possible because the back rank is weak and the pieces around the king are poorly coordinated. In classical chess, these tactical refutations often appear when active rooks and a knight create direct king-side pressure.