blog post about mining puzzles

There was a post with technical description about how the present puzzle set was generated from Lichess database.

I couldn't find it now. Anybody have the link?

lichess.org/blog/YXgv5xMAAMxG4VeC/how-long-does-it-take-to-get-good
This?

@passionate_player said in #2:
> lichess.org/blog/YXgv5xMAAMxG4VeC/how-long-does-it-take-to-get-good
> This?
This is regarding analysis of player improvement. Yeah I came across this too. But not this one.

Thanks anyway.