Queen's Gambit Declined Marshall Defense Puzzle (Rated 1109): Skewer — Decisive Material Gain

This middlegame puzzle shows a classic tactical refutation built around king safety and piece alignment. White’s active bishops and queen create immediate pressure against the exposed black king, while Black’s back rank and loose central pieces make the position vulnerable to a forcing sequence. The key idea is a short skewer: a checking move that drives the king onto a worse square and exposes a high-value target behind it. In classical chess, these motifs often decide games when development and king safety outweigh raw material.