Modern Defense Gellers System Puzzle (Rated 962): Win a Fork — Decisive Material Gain

This middlegame puzzle shows how a single active knight can change the evaluation by creating a fork and forcing the opponent into a passive response. Black’s pieces are coordinated well enough to exploit White’s exposed queen-side placement and the loose bishop on d3. The key idea is not a flashy checkmate, but a tactical sequence that wins material by attacking multiple targets at once while keeping White’s king under pressure.