Grunfeld Defense Fork Intermediate Puzzle (Rated 849): Spot Mate in 2 — Back Rank Mate

This puzzle is a classic tactical refutation where the attacking side uses a forcing check to drag the enemy king into a helpless square. The key idea is that the opponent’s back rank and loose major pieces create a mating net, so material count matters less than king safety. In middlegame positions like this, a single active queen can decide the game by exploiting overloaded defenders and a trapped king.