Petrov's Defense Puzzle (Rated 1241): Win Material — Discovered Attack
This middlegame puzzle is a classic example of a discovered attack that turns a loose king position into a tactical win. Black’s active pieces coordinate against White’s queen and bishop, and the key idea is to force a capture that opens a line for the rook. Once the king is drawn onto the wrong square, the follow-up wins material immediately. The position rewards accurate calculation and recognition of tactical refutation over static material count.