Russian Game Puzzle (Rated 989): Pin — Winning Tactic

This middlegame position demonstrates how a pin can turn a seemingly active piece into a tactical liability. A rook aligns with an enemy bishop and the rook behind it, making the bishop difficult to move safely. At the same time, the queen is under attack, creating a forcing-move challenge. The key strategic idea is to recognize that material can be won by exploiting overloaded defenders and king-zone pressure rather than retreating automatically.