Zukertort Opening Discovered Attack Puzzle (Rated 857): Exploit a Discovered Attack — Decisive Gain
This middlegame puzzle is a classic discovered attack idea: one piece moves with tempo, uncovering a stronger line for a rook behind it. The position is especially sharp because the black knight on f3 is active, the white rook on e1 is overloaded, and the e-file is open. Once the tactical trigger appears, White’s king safety collapses and the defense becomes difficult. The key lesson is that active pieces on open files can create immediate tactical pressure.