Modern Defense Bishop Attack Beginner Puzzle (Rated 921): Win Material — Discovered Attack

This middlegame puzzle is a classic example of a discovered attack: one move opens a line for a long-range piece while creating a direct tactical threat. Black’s active bishop and queen coordinate against White’s loose back-rank and queenside pieces, and the position punishes slow defense. The key idea is not a flashy sacrifice, but a forcing sequence that exploits alignment, piece placement, and the fact that White’s rook can be attacked through the newly opened line.