Bishop's Opening Puzzle (Rated 890): Spot a Fork — Endgame

A knight fork is especially powerful in a chess endgame because one forcing check can attack the king and a valuable piece at the same time. In this position, Black’s knight uses an active outpost to create a double attack against White’s exposed king and rook. White has extra material, but the rook’s advanced placement and limited escape squares make it vulnerable. The winning idea is a tactical refutation that converts king safety concerns into a clear material advantage.