Nxd4 Puzzle (Rated 1500): Fork — Win Material
A knight fork is a powerful tactical idea in which one knight attacks two or more valuable targets at once. In this chess endgame, the knight can check the exposed king while simultaneously attacking a rook. The fork is especially effective because the rook has no useful escape squares, allowing White to convert the tactical opportunity into a decisive material gain. Active piece placement and forcing checks are the key strategic features.