Baltic Defense Puzzle (Rated 1106): Fork the Queen — Win Material in the QGD
When a knight is attacked, retreat feels natural — but in this Queen's Gambit Declined position the 'attacked' knight is actually the aggressor. A knight that can leap deep into enemy territory and land on a square that gives check while simultaneously attacking the queen and a rook is a decisive fork. Because the king must answer the check first, Black gains a free tempo, then collects the loose queen. Winning a whole queen from a single tactical blow converts an opening struggle into a technically won game.