Efim Bogoljubov (Black) Puzzle: Fork — Win Material
A fork attacks two or more valuable targets at once, often combining a check with an attack on a loose rook, queen, or bishop. In this position, the queen can exploit the exposed king and the alignment of Black’s pieces. The key idea is to calculate forcing checks first, then identify whether the king’s movement leaves another major piece vulnerable. This creates a decisive material gain while maintaining pressure against the weakened king.