This puzzle is rated 4000 on chess.com and has a 100% fail rate

Rage Against The Machines

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100 “Hanging Piece” Chess Puzzles for Expert Players (Rating 1800-2100): 100 real-life chess tactics puzzles to make you a better player by Chess Puzzles

Chess.com - This is the hardest puzzle on Chess.com. Rated

Microsoft Entertainment Pack: The Puzzle Collection (PC, 1997) for sale online

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Does number of chess puzzles solved influence average player rating after controlling for total hours played? A critical two-factor analysis based on data from lichess.org (statistical analysis - part 6) : r/chess

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I Reached 4000 Rating In Chess Puzzles!

I solved 5 chess tactic puzzles per day for 2 years. Here's a graph of my improvement over the period (x-post /r/dataisbeautiful) : r/chess

Puzzles with very low pass rates now appearing often - Chess Forums - Chess. com

Why do I struggle to beat 1200s if my puzzle rating is 2000 on chess.com? - Quora

Rex Parker Does the NYT Crossword Puzzle: Botanical opening / FRI 3-20-20 / Chess concession / Kind of horn pitched in E flat / Acted cheekily in two senses / Required wear

Rated 1827, pass rate 68% : r/chess