Sicilian Defense Accelerated Dragon Puzzle (Rated 927): Fork — Material Gain

A fork is powerful when one piece attacks two valuable targets at once, especially when the fork comes with check. In this middlegame position, Black can exploit an apparently favorable situation for White by identifying an undefended bishop and a queen that becomes vulnerable after the forcing move. The key idea is a tactical refutation: remove a valuable piece with tempo, then attack the queen before White can consolidate the extra material.