French Defense Advance Variation Puzzle (Rated 882): Fork — Win Material
A knight fork is a powerful tactical pattern in which one knight attacks two or more valuable targets at once. In this middlegame position, Black uses a forcing check to place the knight on an exceptionally strong square, attacking the king while creating an unavoidable threat against the queen. The key idea is not simply checking, but checking with tempo and exploiting a hanging piece. This transforms a material deficit into a decisive advantage.