Interpreting Stockfish Info

Questions and answers for COW Macintosh and Windows
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TomR
Posts: 31
Joined: Wed Apr 26, 2017 11:43 pm

Interpreting Stockfish Info

Post by TomR »

Using Mac Express Build 64 I get the following eval output for Stockfish 8:

Image

Is this output directly from Stockfish or is it interpreted by COW? I'm guessing the +147 is in fact +1.47? Also what is the 10,480,971 number - the number of positions evaluated?
Last edited by TomR on Mon May 29, 2017 7:16 pm, edited 1 time in total.
sagisag
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Joined: Sun May 07, 2017 11:03 pm

Re: Interpreting Stockfish Info

Post by sagisag »

TomR wrote:Using Mac Express Build 64 I get the following eval output for Stockfish 8:

Image

Is this output directly from Stockfish or is it interpreted by COW? I'm guessing the +147 is in fact +1.47? Also what is the 10,480,971 number - the number of positions evaluated?
+147 is an evaluation in centipawn unit or +1.47 pawn unit.
10480971 is indeed the number of positions.
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MikeAtBookup
Posts: 187
Joined: Mon Aug 01, 2016 2:02 pm

Re: Interpreting Stockfish Info

Post by MikeAtBookup »

If there was a screenshot, I cannot see it.

Yes, by convention, chess engines report their evaluations in centipawns. An eval of +147 would equate to approximately 1.47 pawns for White.
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Mike Leahy
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TomR
Posts: 31
Joined: Wed Apr 26, 2017 11:43 pm

Re: Interpreting Stockfish Info

Post by TomR »

I did post screenshots (in other posts too). I think it's a permissions issue. Can you see the image now?
MikeAtBookup
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Re: Interpreting Stockfish Info

Post by MikeAtBookup »

I still cannot see the screen shot.
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Mike Leahy
:geek: Head Geek at bookup.com
sagisag
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Joined: Sun May 07, 2017 11:03 pm

Re: Interpreting Stockfish Info

Post by sagisag »

TomR wrote:I did post screenshots (in other posts too). I think it's a permissions issue. Can you see the image now?
I can see the image now.
Chess Opening Wizard Professional Build 68
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sagisag
Posts: 31
Joined: Sun May 07, 2017 11:03 pm

Re: Interpreting Stockfish Info

Post by sagisag »

TomR wrote:Using Mac Express Build 64 I get the following eval output for Stockfish 8:

Image

Is this output directly from Stockfish or is it interpreted by COW? I'm guessing the +147 is in fact +1.47? Also what is the 10,480,971 number - the number of positions evaluated?
According to the image this is black to move and COW is showing it as positive score (white advantage +-). If you run Stockfish 8 in console it will show negative score, but same score value. So yes this is an interpretation from COW.

Usually GUI change the sign of the score (if side to move is black), they call it "(WPOV) or White Point of View" if white is better gui will show a positive score, if black is better gui will show a negative score. COW follows this convention.

For the uci engines, it will show the score sign based on the side to move, they call it "(SPOV) or Side Point of View" if side to move is black and score is bad for black it will show a negative score. If side to move is black and score is good for black it will show a positive score. If side to move is white and score is good for white, it will show a positive score. This is specified in uci protocol which all uci engines follow.
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MikeAtBookup
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Re: Interpreting Stockfish Info

Post by MikeAtBookup »

That is correct. In COW, a positive score (with the matching Informant symbol) always means White is favored. Negative means Black is favored.
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Mike Leahy
:geek: Head Geek at bookup.com
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