How is the 5-character code of a puzzle calculated

Each puzzle, as far as I know, has a 5-character code. I would like to know how it is calculated and if it uniquely defines a position. I am not asking if I can search a position using the code. I mean to ask if the code actually encodes a position uniquely. Does lichess use Zobrist hashing or any other known algorithm?

you can probably figure this out from the source code on github

@pkill said in #3:

github.com/ornicar/lichess-puzzler

This is where I was looking but could not find. I will search more.

Of course, I understand that the number of legal positions is enormous, and a 5-character id won't be sufficient. But it could still be useful and unique in practice.

I would guess it's a hash sum (see on wikipedia: hash function) of the original game where the puzzle is taken from.

or maybe it's just a random string :)
https://github.com/ornicar/lichess-puzzler/blob/8ba76ed1b81a2e3458b19743a131622f07d2b0ab/bin/migrate-ids.js#L5

@RandomProcess said in #8:

or maybe it's just a random string :)
github.com/ornicar/lichess-puzzler/blob/8ba76ed1b81a2e3458b19743a131622f07d2b0ab/bin/migrate-ids.js#L5

Thank a lot you for the information.