Black To Move Puzzle (Rated 922): Win Material — Tactical Refutation

This puzzle shows a classic tactical refutation in a simplified middlegame-to-endgame transition. Black’s active rook and bishop coordinate against loose white rooks, turning an apparently balanced position into a decisive material win. The key idea is to notice when an undefended piece sits on an open file and can be hit with forcing moves. In classical chess, these positions often reward direct calculation over slow maneuvering, especially when one side’s king is exposed and piece coordination is poor.