Modern Defense Gellers System Puzzle (Rated 1313): Win Material — Pin Tactic

This middlegame puzzle is about exploiting a pinned defender and turning a tactical detail into a decisive material gain. White’s active bishop and rook coordination create pressure against Black’s kingside, where one defender is overloaded and another piece becomes vulnerable once the tension is resolved. The key idea is not a flashy mating attack, but a clean sequence that wins material by forcing exchanges and leaving Black’s pieces hanging.