Xu Yuhua (Black) Puzzle: Win — Material
This middlegame puzzle demonstrates how a material advantage can suddenly disappear when several pieces are aligned on the same file. The key tactical idea is a skewer: an attacked high-value piece cannot move safely because a second valuable target lies behind it. At the same time, a hanging rook and an exposed knight create overlapping threats. Strong tactical play begins by comparing captures, identifying loose pieces, and finding the move that produces the greatest net material gain.