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Why local evaluation and server side analysis are different (all reasons)?

#1

Hi dear Lichess community.
I used to think that when I request a computer analysis I get a more precise result (exact rating?) compared to local evaluation. and I used to think the reason is the deeper (seeing more moves ahead) analysis (the exact number?) and also stronger computational power of Lichess servers compared to my computer. and those assumptions could explain the slight difference of those two methods of evaluation.
but I am starting to doubt those assumptions.
the puzzle that comes after could serve as good evidence:
https://lichess.org/training/121518

and this is the link to the related game:

https://lichess.org/8AxD0P4r/white#42

you can notice that the SERVER analysis could not find the answer to the puzzle, and strangely enough chooses black as the better side (-1 is the positional evaluation) and suggests 22. Ba2 as the best move for white, which is only the second best move according to the LOCAL evaluation! (the first suggested move of local evaluation IS the answer of the puzzle)

can anyone please explain this matter, and tell the rating of local and server analysis???

Hi dear Lichess community. I used to think that when I request a computer analysis I get a more precise result (exact rating?) compared to local evaluation. and I used to think the reason is the deeper (seeing more moves ahead) analysis (the exact number?) and also stronger computational power of Lichess servers compared to my computer. and those assumptions could explain the slight difference of those two methods of evaluation. but I am starting to doubt those assumptions. the puzzle that comes after could serve as good evidence: https://lichess.org/training/121518 and this is the link to the related game: https://lichess.org/8AxD0P4r/white#42 you can notice that the SERVER analysis could not find the answer to the puzzle, and strangely enough chooses black as the better side (-1 is the positional evaluation) and suggests 22. Ba2 as the best move for white, which is only the second best move according to the LOCAL evaluation! (the first suggested move of local evaluation IS the answer of the puzzle) can anyone please explain this matter, and tell the rating of local and server analysis???
#2

Local bot run WASM binary on server. Not too efficient while server analysis runs it on native application hence more efficient. on server analysis by necessity runs for shorter time - it is shared pool - and hence might miss something.

Install you own copy of stockfish then you can get as good analysis as you want.

Local bot run WASM binary on server. Not too efficient while server analysis runs it on native application hence more efficient. on server analysis by necessity runs for shorter time - it is shared pool - and hence might miss something. Install you own copy of stockfish then you can get as good analysis as you want.
#4

many thanks @petri999
how can I install stockfish so that I can use as a local browser in lichess?!
or maybe you mean to use it in other applications like chessbase?

many thanks @petri999 how can I install stockfish so that I can use as a local browser in lichess?! or maybe you mean to use it in other applications like chessbase?
#5

The computer deep analysis was 3 years old , Lower level of stockfish had analyzed it with lower depth
The local engine is latest Stockfish 12

The computer deep analysis was 3 years old , Lower level of stockfish had analyzed it with lower depth The local engine is latest Stockfish 12
#6

You can literally google "download stockfish"

If you need an interface then google "Arena chess" or "scid chess" and watch a youtube video on how to get it working.

You can literally google "download stockfish" If you need an interface then google "Arena chess" or "scid chess" and watch a youtube video on how to get it working.
#8

@Saeed_tz the computer deep analysis was level 3. Lower level of stockfish had analyzed it with lower depth.

Hope this helps!!

@Saeed_tz the computer deep analysis was level 3. Lower level of stockfish had analyzed it with lower depth. Hope this helps!!
#9

Hi @Diaconu_Teodora. many thanks

how do you know that the level had been 3 ??

Hi @Diaconu_Teodora. many thanks how do you know that the level had been 3 ??

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