Petrovs Defense Karklins Martinovsky Variation Puzzle (Rated 1130): Win Material — Discovered Check

This classical chess middlegame shows how a discovered check can turn an active position into a decisive material win. White’s king is exposed, the black rook is active, and the board contains loose pieces that can be targeted by forcing moves. In positions like this, the best tactic is often not a direct capture, but a move that opens a line for a check while also creating a second threat. That combination of check and pressure is what makes the tactic so strong.