Dutch Defense Korchnoi Attack Puzzle (Rated 1420): Trap a Piece — Decisive Material Gain

This middlegame puzzle is a classic example of how a trapped piece can decide the game even when the material count looks close. White’s active queen and knight coordination create immediate pressure against loose black pieces, especially the queen and rook on the queenside. The key idea is not a flashy mating attack, but a tactical refutation that wins material by exploiting overload, poor piece coordination, and a piece with no safe squares.