Lichess puzzle ratings are completely puzzling. For example this
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Puzzles vs. Games - by Nate Solon - Zwischenzug

CheckRaiseMate's Blog • Puzzles vs. Games •
Mate in 1 (Chess Puzzles) - Apps on Google Play

The vision of Lichess and its founder Thibault Duplessis - ChessBase India

Lichess Puzzles are too easy. • page 1/12 • General Chess Discussion •

Lichess' Number 1 puzzle according to google, and it's WRONG!!!!! • page 1/2 • Game analysis •

Seriously? What is the point is putting 13 moves tactics (26 ply deep) with 3800 rating??? - Chess Forums

Quantity over quality (ChessTech News)
How good can you get at chess by just completing puzzles, (specifically the training on Lichess app)? - Quora

The vision of Lichess and its founder Thibault Duplessis - ChessBase India

Grandmaster Guide to Learn and Improve Chess Tactics

The Tactics Ladder, Vol. I, Red Series: 1000 Chess Puzzles, A Chess Tactics Book for Expert Players - 2000 FIDE Level eBook : Justesen, Martin: Kindle Store
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