Bishop's Opening Berlin Defense Puzzle (Rated 1306): Win Material — Crushing Middlegame Tactic

This middlegame puzzle is built around a powerful pin and a hanging piece. White’s bishop creates pressure on the e7-knight, but Black can turn the tables by attacking the queen and exploiting the loosened king shelter. The key idea is to force a simplification that removes White’s active defenders and wins material. In practical classical chess, these are the moments where active piece placement and direct threats matter more than long-term structure.