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Value of the puzzles

#1

How are the points for the training puzzles determined? Specifically,

a) How are the games selected?
b) How is the initial value calculated?
c) Do the points depend on the strength of the player solving them?
d) Does the evaluation get adjusted with more player solving or failing to solve them?

I've got the impression that points for the puzzle of the day are different from “normal” puzzles, maybe because in general many more players have tried the puzzle of the day? As for a) and b), the beauty of a puzzle probably plays a role but does chess software know about it?

How are the points for the training puzzles determined? Specifically, a) How are the games selected? b) How is the initial value calculated? c) Do the points depend on the strength of the player solving them? d) Does the evaluation get adjusted with more player solving or failing to solve them? I've got the impression that points for the puzzle of the day are different from “normal” puzzles, maybe because in general many more players have tried the puzzle of the day? As for a) and b), the beauty of a puzzle probably plays a role but does chess software know about it?
#2

"Generating these chess puzzles took more than 50 years of CPU time. We went through 300,000,000 analysed games from the Lichess database, and re-analyzed interesting positions with Stockfish 12/13/14/15 NNUE at 40 meganodes. The resulting puzzles were then automatically tagged. To determine the rating, each attempt to solve is considered as a Glicko2 rated game between the player and the puzzle. Finally, player votes refine the tags and define popularity." - https://database.lichess.org/#puzzles

You may find further answers here:

https://lichess.org/blog/X-S6gRUAAGjNX4ki/new-puzzles-are-here
https://github.com/ornicar/lichess-puzzler

"Generating these chess puzzles took more than 50 years of CPU time. We went through 300,000,000 analysed games from the Lichess database, and re-analyzed interesting positions with Stockfish 12/13/14/15 NNUE at 40 meganodes. The resulting puzzles were then automatically tagged. To determine the rating, each attempt to solve is considered as a Glicko2 rated game between the player and the puzzle. Finally, player votes refine the tags and define popularity." - https://database.lichess.org/#puzzles You may find further answers here: https://lichess.org/blog/X-S6gRUAAGjNX4ki/new-puzzles-are-here https://github.com/ornicar/lichess-puzzler

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