Russian Game Cozio Attack Puzzle (Rated 855): Win Material — Tactical Refutation

This middlegame puzzle is about recognizing a tactical refutation when a pinned piece and loose coordination create a direct material win. White’s active rook on the open file and the centralized knight work together to punish Black’s last move. The key idea is that one capture forces a response, and the resulting exchanges leave White ahead in material with no compensation. In classical chess, these moments often decide the game long before any endgame is reached.