Rated chess puzzles - 'mate in 5' or more.

hard chess puzzles – Daily Chess Musings

500 Chess Puzzles, Mate In 6, Expert Level 9781006892387

Best Chess Puzzles, Jan.-June, 2019 - Harvey, Bill: 9781081378134 - AbeBooks

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500 Chess Puzzles, Mate in 5, Advanced & Expert Level: Solve chess problems and improve your tactical chess skills (I'm progressing in Chess)

Difficult Chess Puzzles for Advanced Players

How to Solve Any Chess Tactics Puzzle

What is the hardest mate-in-4 puzzle? - Quora

14 Chess Puzzles for Intermediate Players –

Puzzle Academy Content Update 3, including two complete endgames

Chess puzzles usually involve the sacrifice of the queen or several other pieces. How often does this occur in real games? Have you ever sacrificed a queen to mate the opponent?