Hard chess puzzles are exactly what the name suggests. If you managed to ignore the "Hint" button through the Mate-in-1 and Intermediate levels, you might finally want to reach for it now. Don't worry—it won't make the move for you. On a crowded board, it simply highlights the piece you need to move, leaving the exact destination for you to figure out; a lifesaver when the path forward gets murky. Ever seen Anastasia’s mate executed after a staggering queen sacrifice? Ever witnessed Blackburne — 'The Black Death' of 19th-century chess — dismantle a king using no queens or rooks, but merely two bishops and a knight? Dive into these hard chess puzzles and discover them for yourself. Just be sure to bring your strategic thinking: calculating three or four moves ahead on a crowded board is nothing short of Napoleonic mastery.