Bishop's Opening Puzzle (Rated 859): Fork — Decisive Material Gain

This middlegame puzzle is built around a forcing knight tactic that creates a decisive material gain. White’s pieces are active, the black king is exposed, and a key rook is vulnerable to a fork. The idea is to use a check to drag the king into a worse square, then win the hanging rook on the next move. These positions reward fast calculation, especially when the opponent’s king and heavy pieces are lined up on the same rank or file.