Tan Zhongyi (White) Puzzle: Fork — Win Material

A fork is a tactical idea in which one piece creates two or more simultaneous threats. In this chess endgame, Black’s rook uses a forcing check to attack the exposed king while also targeting a valuable piece. The centralized white king has limited freedom, and the rook’s activity is strengthened by the bishop’s control of key squares. Once the king responds, the second threat becomes decisive, allowing Black to win material and convert the advantage.