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Very Hot Topic (More than 25 Replies) Stockfish 9 Released ! (Read 10712 times)
proustiskeen
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Re: Stockfish 9 Released !
Reply #43 - 11/30/18 at 22:33:37
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I sent all the files to virustotal and they all came back clean. (Links to the results on the 'stockfish for analysis' page.) It must be your AV being cautious.
  
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Re: Stockfish 9 Released !
Reply #42 - 11/30/18 at 08:08:17
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proustiskeen wrote on 11/30/18 at 04:40:09:
Now that SF10 is out, I went ahead and made a similar C0 compile.

https://firstlookchess.com/blog/2018/11/29/stockfish-10-c0/


Thank you!

I had a slight install problem (windows 10, 64bit), when my virus application F-Secure didn't allow install. After I manually allowing the install, the engine is ok. Hopefully I do not get any problems because of that.
  
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Re: Stockfish 9 Released !
Reply #41 - 11/30/18 at 04:40:09
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Now that SF10 is out, I went ahead and made a similar C0 compile.

https://firstlookchess.com/blog/2018/11/29/stockfish-10-c0/

@TonyK, let me know if this 32 bit version works?
  
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proustiskeen
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Re: Stockfish 9 Released !
Reply #40 - 06/26/18 at 18:04:09
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Glad you found the compile useful, Brabo. It's not fancy - I don't know all the flags, bells and whistles to get the fastest thing imaginable - but it gets the job done.
  
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Re: Stockfish 9 Released !
Reply #39 - 06/25/18 at 11:56:38
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I just published an article about the contempt on my blog: https://chess-brabo.blogspot.com/2018/06/contempt.html

One thing which (slightly) surprised me about this contempt is that the impact seems only to happen for the first 20 moves. I guess the code of the program is written in such way that the bonus (= contemptvalue) is only given above a number of pieces on the board. Once some pieces are exchanged then no bonus can be received anymore and the effect of the contempt disappears. Probably the developers saw no gain of rating anymore in an active contempt for positions with few (or below x number of) pieces on the board.
  
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Keano
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Re: Stockfish 9 Released !
Reply #38 - 05/19/18 at 17:11:51
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an ordinary chessplayer wrote on 05/15/18 at 13:54:48:
Yes there is this option in ChessBase, but the trick is getting it to be the default when you load the engine, as opposed to changing it each time you load the engine. Read back through this thread, GMTonyKosten gave a simple method for a new engine install, and I gave a slightly harder method for an existing engine.


well I have set my existing engine contempt to 0 and it seems to stay --> options --> engines --> select engine --- advanced

I hope I am right in doing this like, trusting you lot  Wink
  
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Re: Stockfish 9 Released !
Reply #37 - 05/16/18 at 11:45:31
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an ordinary chessplayer wrote on 05/14/18 at 15:08:45:
Contempt is for practical play, where the engine only plays one side. In analysis mode, we use the engine to examine both sides. When the engine switches from looking at white candidates to looking at black candidates (e.g. spacebar), it will also switch from "contempt for black" to "contempt for white" - a swing in evaluation of 2*contempt for any "normal" move. It's confusing.


ah, that's perhaps why I've found it to be so volatile.

an ordinary chessplayer wrote on 03/02/18 at 02:45:39:
Find the .uci file and add the following line to the [OPTIONS] section:
Contempt=0


sorted, thanks Smiley
  

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an ordinary chessplayer
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Re: Stockfish 9 Released !
Reply #36 - 05/15/18 at 13:54:48
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Yes there is this option in ChessBase, but the trick is getting it to be the default when you load the engine, as opposed to changing it each time you load the engine. Read back through this thread, GMTonyKosten gave a simple method for a new engine install, and I gave a slightly harder method for an existing engine.
  
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Keano
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Re: Stockfish 9 Released !
Reply #35 - 05/15/18 at 10:32:49
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an ordinary chessplayer wrote on 05/14/18 at 15:08:45:
Contempt is for practical play, where the engine only plays one side. In analysis mode, we use the engine to examine both sides. When the engine switches from looking at white candidates to looking at black candidates (e.g. spacebar), it will also switch from "contempt for black" to "contempt for white" - a swing in evaluation of 2*contempt for any "normal" move. It's confusing.


It certainly is confusing. So in Chessbase UCI engine there is an option to set contempt to zero?
  
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an ordinary chessplayer
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Re: Stockfish 9 Released !
Reply #34 - 05/14/18 at 15:08:45
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Contempt is for practical play, where the engine only plays one side. In analysis mode, we use the engine to examine both sides. When the engine switches from looking at white candidates to looking at black candidates (e.g. spacebar), it will also switch from "contempt for black" to "contempt for white" - a swing in evaluation of 2*contempt for any "normal" move. It's confusing.
  
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Re: Stockfish 9 Released !
Reply #33 - 05/14/18 at 13:47:14
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So its better to not have any contempt factor (i.e. set to zero)?

Are we sure on this?
  
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Re: Stockfish 9 Released !
Reply #32 - 03/28/18 at 18:43:16
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I still wonder what rating it will reach at the end (on a given hardware of course). Obviously it can improve yet in some kinds of positions (queen vs. 3 pieces & so on...).
  
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Re: Stockfish 9 Released !
Reply #31 - 03/02/18 at 10:06:04
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brabo wrote on 02/27/18 at 16:46:17:
each time I switch between engines the default setting is restored and I have to do it over again.


I decided to download the 'stock' Stockfish 9 for Windows, set the contempt factor to 0 when creating the UCI and this works fine ... and the contempt factor appears to stay at 0 on my machine whenever I change engines!
I've no idea what the problem was before, maybe the ZIP file was corrupted somewhere along the line?
  
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an ordinary chessplayer
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Re: Stockfish 9 Released !
Reply #30 - 03/02/18 at 06:03:21
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proustiskeen wrote on 03/02/18 at 00:42:13:
if you put a 32 bit exe in 'Program Files' instead of 'Program Files x86' perhaps the OS balks?

Nope. I tried it with your 32-bit stockfish and it ran fine.

Based on TD's and GMTonyKosten's results, I would say that someone tampered with your first effort... Sad
  
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an ordinary chessplayer
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Re: Stockfish 9 Released !
Reply #29 - 03/02/18 at 03:06:22
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I was testing the ChessBase 14 GUI with Stockfish 9, using the same random position as in the command-line session earlier ... position after 1.e4 e5 2.Qh5 Na6. There was nothing unexpected in my results:

Depth Score Bestmove "Engine" (Option)
30 1.41 3.Qxe5+ "Stockfish 9 64" (Contempt=20)
30 1.13 3.Qxe5+ "Stockfish 9 64" (Contempt=0)
30 1.18 3.Bxa6 "Stockfish 9 64 C0"

But since I was online, ChessBase also fed the position to some cloud engines. Be forewarned, it looks like the cloud versions of Stockfish are also using the contempt factor:

Depth Score Bestmove "Engine" 
33 1.35 3.Qxe5+ "Stockfish 9"
27 1.48 3.Qxe5+ "Stockfish 180218"
26 1.05 3.Bxa6 "Komodo 9.02 64-bit"
26 1.04 3.Qxe5+ "Komodo 10.2 64-bit"

  
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an ordinary chessplayer
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Re: Stockfish 9 Released !
Reply #28 - 03/02/18 at 02:45:39
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brabo wrote on 02/27/18 at 16:46:17:
Yes I know it is easy to switch off this contempt factor but each time I switch between engines the default setting is restored and I have to do it over again. Does somebody has an easy fix for that?


Find the .uci file and add the following line to the [OPTIONS] section:
Contempt=0

Mine is at:
C:\Users\redacted\AppData\Roaming\ChessBase\Engines.UCI\Stockfish 9 64.uci
  
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proustiskeen
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Re: Stockfish 9 Released !
Reply #27 - 03/02/18 at 00:42:13
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Does a 64 bit file work?

Edit - if you put a 32 bit exe in 'Program Files' instead of 'Program Files x86' perhaps the OS balks?
« Last Edit: 03/02/18 at 03:28:32 by proustiskeen »  
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an ordinary chessplayer
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Re: Stockfish 9 Released !
Reply #26 - 03/02/18 at 00:34:14
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I think that's the message you get when you try to run a 16-bit .exe on a 64-bit system.

Edited:
I just downloaded from the amazon link.
$ stockfish_9_x32_analysis.exe
Stockfish 9 C0 by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
uci
id name Stockfish 9 C0
id author T. Romstad, M. Costalba, J. Kiiski, G. Linscott

option name Debug Log File type string default
option name Contempt type spin default 0 min -100 max 100
etc.

I am on Windows 10 Home, 64-bit.
  
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Re: Stockfish 9 Released !
Reply #25 - 03/02/18 at 00:13:37
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proustiskeen wrote on 03/01/18 at 20:13:03:
What version of Windows are you using, Tony?


I'm on Win 10.
From the command line I get: 'stockfish_9_x32_analysis.exe is not compatible with the version of Windows you're running. Check your computer's system information and then contact the software publisher.'
  
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an ordinary chessplayer
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Re: Stockfish 9 Released !
Reply #24 - 03/01/18 at 23:31:05
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@brabo - Thanks for pointing out the Contempt. I didn't notice that myself so probably would have made some strange decisions based on it.

@GMTonyKosten - I was pretty sure those errors did not apply to you, but it is hard to think what else might be wrong with your setup, besides a bad compile which you have no control over. I can't download proustikeen's version on this machine, but I can try it when I get home.

It is possible to run the engine from the command line to see if everything is okay. Here is a session I just did on the official release. My commands are in bold. The difference is not quite 20 centipawns, but it's close.

Quote:
$ stockfish_9_x64.exe
Stockfish 9 64 by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
uci
id name Stockfish 9 64
id author T. Romstad, M. Costalba, J. Kiiski, G. Linscott

option name Debug Log File type string default
option name Contempt type spin default 20 min -100 max 100
option name Threads type spin default 1 min 1 max 512
option name Hash type spin default 16 min 1 max 131072
option name Clear Hash type button
option name Ponder type check default false
option name MultiPV type spin default 1 min 1 max 500
option name Skill Level type spin default 20 min 0 max 20
option name Move Overhead type spin default 30 min 0 max 5000
option name Minimum Thinking Time type spin default 20 min 0 max 5000
option name Slow Mover type spin default 89 min 10 max 1000
option name nodestime type spin default 0 min 0 max 10000
option name UCI_Chess960 type check default false
option name SyzygyPath type string default <empty>
option name SyzygyProbeDepth type spin default 1 min 1 max 100
option name Syzygy50MoveRule type check default true
option name SyzygyProbeLimit type spin default 6 min 0 max 6
uciok
isready
readyok
ucinewgame
isready
readyok
position startpos moves e2e4 e7e5 d1h5 b8a6
go depth 30
(... output snipped ...)
info depth 30 seldepth 41 multipv 1 score cp 134 nodes 134484918 nps 1603320 has
hfull 999 tbhits 0 time 83879 pv h5e5 d8e7 e5e7 g8e7 a2a3 d7d5 e4d5 e7d5 g1f3 f8
d6 b1c3 d5f6 f1c4 e8g8 e1g1 c7c6 d2d3 a6c7 f1e1 c8g4 f3g5 g4f5 c3e4 f5e4 g5e4 f6
e4 d3e4 a8e8 c1d2 b7b5 c4d3 g7g6 d2c3
bestmove h5e5 ponder d8e7
stop
setoption name Contempt value 0
isready
readyok
ucinewgame
isready
readyok
position startpos moves e2e4 e7e5 d1h5 b8a6
go depth 30
(... output snipped ...)
info depth 30 seldepth 43 multipv 1 score cp 118 nodes 146824403 nps 1572989 has
hfull 999 tbhits 0 time 93341 pv h5e5 d8e7 e5e7 g8e7 f1a6 b7a6 f2f3 d7d5 d2d3 d5
e4 f3e4 f7f5 b1c3 f5e4 c3e4 c8f5 g1f3 e7c6 c1e3 f5e4 d3e4 e8c8 e1e2 f8d6 f3d2 d6
e5 c2c3 h8e8 a1f1 e5f6 f1e1 a6a5 e1f1 a5a4 h2h3
bestmove h5e5 ponder d8e7
quit

$



  
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proustiskeen
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Re: Stockfish 9 Released !
Reply #23 - 03/01/18 at 20:13:03
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What version of Windows are you using, Tony? I've only tested on 8 and 10.
  
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Re: Stockfish 9 Released !
Reply #22 - 03/01/18 at 20:03:26
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an ordinary chessplayer wrote on 03/01/18 at 14:16:36:
  • It should be unzipped before finding it in the Create UCI Engine dialog.
  • ChessBase says it doesn't matter what folder the engine is in, but it was suggested on the web that it does matter. If you have a working engine then try a folder in the same neighborhood.


  • Yes, I unzipped it and put the appropriate files in an adjacent directory to the Stockfish 8 one.
      
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    TD
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    Re: Stockfish 9 Released !
    Reply #21 - 03/01/18 at 19:40:01
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    proustiskeen wrote on 03/01/18 at 14:22:24:
    If Mediafire is serving bad ads, you can also try this link:

    https://www.amazon.com/clouddrive/share/gCUFWYDJDjDMurP95tGEFZSMzteh1gzjZ7WTuqVB...

    This one worked. Thank you!
      
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    proustiskeen
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    Re: Stockfish 9 Released !
    Reply #20 - 03/01/18 at 14:22:24
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    If Mediafire is serving bad ads, you can also try this link:

    https://www.amazon.com/clouddrive/share/gCUFWYDJDjDMurP95tGEFZSMzteh1gzjZ7WTuqVB...
      
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    proustiskeen
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    Re: Stockfish 9 Released !
    Reply #19 - 03/01/18 at 14:20:02
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    Did you unzip the file and extract the folder with the uci engines in it?
      
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    an ordinary chessplayer
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    Re: Stockfish 9 Released !
    Reply #18 - 03/01/18 at 14:16:36
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    A couple of ideas.
    1. It should be unzipped before finding it in the Create UCI Engine dialog.
    2. ChessBase says it doesn't matter what folder the engine is in, but it was suggested on the web that it does matter. If you have a working engine then try a folder in the same neighborhood.

      
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    Re: Stockfish 9 Released !
    Reply #17 - 03/01/18 at 14:01:15
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    proustiskeen wrote on 03/01/18 at 13:32:12:
    There are four different compiles in the zip folder, and you should choose one according to the notes in the info.txt and on the website. (You want to match your processor.)
                       


    I tried downloading again but when I 'Create UCI engine' and find the .exe file nothing happens, no name, no parameters.
      
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    proustiskeen
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    Re: Stockfish 9 Released !
    Reply #16 - 03/01/18 at 13:32:12
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    Or, rather, they are. There are four different compiles in the zip folder, and you should choose one according to the notes in the info.txt and on the website. (You want to match your processor.)
      
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    Re: Stockfish 9 Released !
    Reply #15 - 03/01/18 at 13:28:43
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    Yes, Tony, it's for Windows.
      
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    proustiskeen
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    Re: Stockfish 9 Released !
    Reply #14 - 03/01/18 at 13:28:30
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    The file host is serving up bad ads. Let me know if this is better.

    http://www.mediafire.com/file/fvhatra7r5asaru/Stockfish-9-analysis-win.zip
      
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    Re: Stockfish 9 Released !
    Reply #13 - 03/01/18 at 12:25:39
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    proustiskeen wrote on 03/01/18 at 03:17:28:
    I compiled Stockfish 9 with contempt=0. You can download it here:


    I downloaded this OK (I ignored the 'notification'), but it wouldn't run on my ChessBase, is it a Windows version?
      
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    Re: Stockfish 9 Released !
    Reply #12 - 03/01/18 at 08:12:20
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    proustiskeen wrote on 03/01/18 at 03:17:28:
    I compiled Stockfish 9 with contempt=0. You can download it here:

    https://chessbookreviews.wordpress.com/stockfish-9-for-analysis/

    I tried to download this, but got some voice telling me that my computer was infected by a virus and I had to follow their instructions???
      
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    Re: Stockfish 9 Released !
    Reply #11 - 03/01/18 at 03:17:28
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    I compiled Stockfish 9 with contempt=0. You can download it here:

    https://chessbookreviews.wordpress.com/stockfish-9-for-analysis/
      
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    Re: Stockfish 9 Released !
    Reply #10 - 02/28/18 at 09:40:13
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    GMTonyKosten wrote on 02/28/18 at 09:17:37:
    brabo wrote on 02/27/18 at 16:46:17:
    I am really annoyed by this contempt factor which was increased to 0,2


    Does this make game analysis less accurate than when using Stockfish 8?

    Very good question but very hard to answer. I see 2 reasons.
    1) It depends if you are able to properly interpret the effect of the contempt factor. I just checked a position in which Stockfish 9 with contempt gives a small edge. However without the contempt it shows equal as the evaluation just drops below the threshold. Equal is definitely a more accurate assessment. Not taking the effect of the contempt into account will definitely cause for some positions a less accurate assessment with Stockfish 9 compared to Stockfish 8.
    2) However it would be an error to attribute the full rating-gain of Stockfish 9 purely to the contempt-introduction. Many other things were also adapted. I have noticed for some specific positions already an improvement in analysis by Stockfish 9 which reverted some earlier done analysis by Stockfish 8.

    So the answer isn't straightforward. Anyway I do believe that Stockfish 9 without contempt is better to analyze than Stockfish 8.
      
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    Re: Stockfish 9 Released !
    Reply #9 - 02/28/18 at 09:27:19
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    El_Commandante wrote on 02/28/18 at 09:05:38:
    [quote author=5A4A595A57380 link=1517489222/6#6 date=1519804771]

    As far as I know, in tournaments the settings of an engines must be on default. Under this circumstances setting the contempt factor to 0 would mean, that Stockfish would make a lot of draws against weaker engines (i.e. by allowing a repetition in a slightly worse position). This can be avoided by setting the contempt factor to 20.

    Which tournaments are you talking about? For TCEC any programmer can submit their preferred version of the engine. That has nothing to do with providing a site with 1 or more versions of an engine (I would like best version to analyze and best version to play). In fact stockfish does provide different versions to download on their development page. I couldn't find the one specific without contempt but you could find e.g. a brand-new one introducing a dynamic contempt feature.
      
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    Re: Stockfish 9 Released !
    Reply #8 - 02/28/18 at 09:17:37
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    brabo wrote on 02/27/18 at 16:46:17:
    I am really annoyed by this contempt factor which was increased to 0,2


    Does this make game analysis less accurate than when using Stockfish 8?
      
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    Re: Stockfish 9 Released !
    Reply #7 - 02/28/18 at 09:05:38
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    brabo wrote on 02/28/18 at 07:59:31:
    Yes that works fine. It would be good to have such version available to download for everybody. Maybe it is already somewhere but I couldn't find so via a general search. I guess many will find it difficult to execute your solution. I believe most players are using the engines in the first place to analyze positions and only secondary to let them play. More I will likely write about in a later article on my blog.


    As far as I know, in tournaments the settings of an engines must be on default. Under this circumstances setting the contempt factor to 0 would mean, that Stockfish would make a lot of draws against weaker engines (i.e. by allowing a repetition in a slightly worse position). This can be avoided by setting the contempt factor to 20.
      
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    Re: Stockfish 9 Released !
    Reply #6 - 02/28/18 at 07:59:31
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    proustiskeen wrote on 02/27/18 at 19:57:19:
    The short answer is that you'll have to compile your own version and modify the ucioptions.cpp file to remove the contempt by setting it to 0.

    Yes that works fine. It would be good to have such version available to download for everybody. Maybe it is already somewhere but I couldn't find so via a general search. I guess many will find it difficult to execute your solution. I believe most players are using the engines in the first place to analyze positions and only secondary to let them play. More I will likely write about in a later article on my blog.
      
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    Re: Stockfish 9 Released !
    Reply #5 - 02/28/18 at 04:38:26
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    ErictheRed wrote on 02/28/18 at 02:43:02:
    What is the contempt factor?

    ‘The contempt feature of Stockfish tries to prevent the engine from  simplifying the position too quickly when it feels that it is very slightly behind, instead keeping the tension a little bit longer. This november discussion left open the decision of which “default”  value for contempt we should use for Stockfish, taking into account  the various uses of Stockfish (opening preparation for humans, computer online tournaments,analysis tool for web pages, human/computer play,
    etc).  This pull request proposes to set the default contempt value of SF to twenty centipawns, which turns out to be the highest value which is not a regression against current master, as this seemed to be a good compromise between risk and safety.’
      
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    Re: Stockfish 9 Released !
    Reply #4 - 02/28/18 at 02:43:02
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    What is the contempt factor?
      
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    Re: Stockfish 9 Released !
    Reply #3 - 02/27/18 at 19:57:19
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    The short answer is that you'll have to compile your own version and modify the ucioptions.cpp file to remove the contempt by setting it to 0.
      
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    Re: Stockfish 9 Released !
    Reply #2 - 02/27/18 at 18:26:56
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    brabo wrote on 02/27/18 at 16:46:17:
    I started to use Stockfish 9 but I am really annoyed by this contempt factor which was increased to 0,2. I am used to classify lines of an opening by their engine-evaluation but now this contempt factor spoils the accuracy.
    Yes I know it is easy to switch off this contempt factor but each time I switch between engines the default setting is restored and I have to do it over again. Does somebody has an easy fix for that?

    Brabo, I have mentioned your problem at the Dutch site https://www.schaaksite.nl/2018/02/23/stockfish-9-sterker-door-minachting-tegenst....
    Maybe that will provide you with an answer.
      
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    Re: Stockfish 9 Released !
    Reply #1 - 02/27/18 at 16:46:17
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    IM_Serious wrote on 02/01/18 at 12:47:02:
    Stockfish 9 Released !

    stockfishchess.org/download/

    I started to use Stockfish 9 but I am really annoyed by this contempt factor which was increased to 0,2. I am used to classify lines of an opening by their engine-evaluation but now this contempt factor spoils the accuracy.
    Yes I know it is easy to switch off this contempt factor but each time I switch between engines the default setting is restored and I have to do it over again. Does somebody has an easy fix for that?
      
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    Stockfish 9 Released !
    02/01/18 at 12:47:02
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    Stockfish 9 Released !

    stockfishchess.org/download/
      
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