Petrov's Defense Puzzle (Rated 907): Fork — Win Material

A fork is a powerful tactical idea in which one piece creates multiple threats at once, often attacking valuable targets while gaining time. In this Petrov's Defense middlegame, active queen placement exposes a loose enemy piece and creates a decisive material advantage. The key lesson is that equal material does not mean equal safety: an overloaded defender, an exposed king, or a rook placed too aggressively can allow a forcing tactical sequence.