Ponziani Opening Jaenisch Counterattack Fork Puzzle (Rated 1065): Win with a Fork — Decisive Material Gain
This middlegame puzzle is a classic example of tactical refutation: one active queen move creates immediate pressure against the enemy king while also winning material. The key idea is that checks often force the opponent into a narrow set of replies, and that can expose a hanging piece or create a fork on a valuable target. Even when White appears materially ahead, king safety and piece activity can completely flip the evaluation in classical chess.