Lichess puzzle ratings are completely puzzling. For example this is rated 1813. I would expect a complete novice to solve this. Whereas I've seen mate in 6 with brilliant moves being rated

Puzzle ratings become bogus, +400 rating once you hit puzzle 121xxx series • page 1/3 • General Chess Discussion •

What kind of penalty is there in chess for flipping over the board or scattering the pieces? - Quora

Puzzles •

It's too easy to accidentally get rated when reviewing failed Puzzle Storm problems · Issue #11379 · lichess-org/lila · GitHub

The lower the puzzle rating, the more likely the solution is a check or capture! : r/chess

Why is it advised to not move the same piece twice in a chess game? - Quora

Found this Beautiful 1900 rated puzzle on lichess. White to move and win material. : r/chess

Some Puzzling Analysis

In chess, why isn't it possible/legal to take your own pieces if it would save your king? How would this feature affect the game? - Quora

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

What is meant by Sicilian in chess? - Quora