What are “threads” in the analysis and what should i keep it set to?

The little arrows point in the middle, and sometime i keep it there, and sometime i turn it off, and sometimes its on 4/4, but i dont know what it is

It's roughly the amount of CPU power you'd like to commit to the engine, if you put it to max your device may get slow, when the engine is running.

You can set it lower if you have problems with the system getting slow otherwise max-1 is probably good.

It's the number of CPU cores used.

More threads means more speed, but it may make other things slower on your device. And it consumes more power (equals shorter battery life), and generates more heat.

@lonelypeanut said in #2:

It's roughly the amount of CPU power you'd like to commit to the engine, if you put it to max your device may get slow, when the engine is running.

You can set it lower if you have problems with the system getting slow otherwise max-1 is probably good.

Whats CPU sorry im bad with computers

@Planet_CHESS465 said in #4:

Whats CPU sorry im bad with computers

Central processing unit, basically the more your computer has the faster the computer, if you set threads as high as it goes without making your device slow your analysis will go as fast as it can, if you set it lower it's going to be slower.

Really explaining what threats are is actually not that easy if you're not a computer nerd type person.

It's really all not too relevant either as long as it's working.

Also look at this: https://stockfishchess.org/blog/2020/introducing-nnue-evaluation/

Can someone please explain this a bit better, i dont understabd the difference between the “classical” and “nnue” which is better/stronger?

The new "NNUE" versions are generally stronger than classical ones. However, that does not necessarily mean they would be also more useful for you. The problem is that chess engines already reached the point where it's often quite hard to interpret the results in a way that would be actually helpful - and further development makes it worse, not better.

See e.g. https://lichess.org/forum/general-chess-discussion/help-me-please-tech-guys-tournament-preparation#5 where I wrote a bit more about this problem.

@Planet_CHESS465 said in #6:

which is better/stronger?
The truth is that unless you are doing master-level opening prep, running a chess engine tournament, or solving anti-engine puzzle compositions, none of these settings will matter, the engine will play far stronger than any human regardless of how it is set up.

@corvusmellori said in #8:

The truth is that unless you are doing master-level opening prep, running a chess engine tournament, or solving anti-engine puzzle compositions, none of these settings will matter, the engine will play far stronger than any human regardless of how it is set up.

Thats true, but which is stronger? :D

@Planet_CHESS465 said in #9:

Thats true, but which is stronger? :D
If you care at all about engine strength, you shouldn't be using the lichess web engine at all - you should be downloading a native stockfish binary, and running on your PC locally using a tool like Scid.

The exact settings that are strongest depend strongly on how long you're letting the engine run. For deep analysis, I'd start by looking at the settings used by the stockfish time at TCEC.