Sting SF 1.0 is out

[lech]

Sting SF is open source code software (thread) based on Stockfish (2.1.1) without exe-files.
Sting SF is to help detect, impossible to find or time consuming for engines, sacrifices.
Unfortunately, but just Stockfish is very weak to find difficult sacrifices and thus is not a good tool to make any analysis.
Sting SF project should very help you to get a reliable result in analysis.
Sting SF uses the option : “Sacrifice detection” (0 – 8, 8 = default, 0 = disabled).
BTW. I tested a strength (Sacrifice detection = 8). Sting seems to be stronger than Stockfish.

I ask Jim Ablett to compile my project and to make it available for all (thanks in advance!):
www.free.of.pl/c/ccintorun/g/sting.rar

The difference in the code - my idea - is below:

Code: Select all

// Step extra (after step 7) - detection of good sacrifices.
if (    depth >= 8 * ONE_PLY          
        &&  SacrificeDetection // default option = 8    
        && !ss->skipSacrificeDetection
        &&  pos.captured_piece_type() != PIECE_TYPE_NONE
        && !Root
        &&  beta < VALUE_KNOWN_WIN&#41;
    &#123;
       Value q;
       if (&#40;ss-1&#41;->captureValue != VALUE_NONE&#41; q = -&#40;ss-1&#41;->captureValue;
       else if &#40;tte && tte->depth&#40;) >= 8 * ONE_PLY&#41; q = ss->eval;
       else q = ss->eval = qsearch<PV>&#40;pos, ss, -VALUE_INFINITE, VALUE_INFINITE, DEPTH_ZERO&#41;);
       
       TT.store&#40;posKey, VALUE_NONE, VALUE_TYPE_NONE, DEPTH_NONE, ttMove, ss->eval, ss->evalMargin&#41;;
                
       Depth d = depth - depth/10;
       int i = 0;
       Value step = PawnValueMidgame / SacrificeDetection;
       Value v = q;

       while &#40;true&#41;
       &#123;  
         ss->captureValue = v;        
         Value rAlpha = Min&#40;alpha, v + step&#41;;
         if &#40;rAlpha == alpha && d <= depth&#41; break;
         if &#40;d >= depth + depth/10&#41; rAlpha = alpha;
         Value rBeta = rAlpha == alpha ? beta &#58; rAlpha + 1;

         ss->skipSacrificeDetection = true;          
         v = search<PvNode>&#40;pos, ss, rAlpha, rBeta, d&#41;;
         ss->skipSacrificeDetection = false;          
        
         i++;

         if &#40;v > rAlpha && d >= depth&#41; 
         &#123; 
           if &#40;v > alpha&#41; return v;
           if &#40;v >= PawnValueMidgame + step&#41;
           &#123;
             Value bonus = Min&#40;QueenValueMidgame, &#40;v - q&#41; / step * &#40;i * i * SacrificeDetection&#41;);             
             if &#40;v + bonus > alpha&#41;
             &#123;
               TT.store&#40;posKey, VALUE_NONE, VALUE_TYPE_NONE, DEPTH_NONE, ss->bestMove, ss->eval, ss->evalMargin&#41;;
               return v + bonus;
             &#125;            
           &#125;          
         &#125;
         if &#40;v <= rAlpha&#41; return v;         

         d = d + ONE_PLY;         
       &#125;       
    &#125;
 

[MikeGL]

I have problem connecting to .pl domains I guess.
Can we grab it in mediafire or some other sites with different URL without .pl

[Ajedrecista]

Hello Mike:

I have problem connecting to .pl domains I guess.
Can we grab it in mediafire or some other sites with different URL without .pl

It seems that this file contains the sources. Mediafire link:

http://www.mediafire.com/?jf1omcgkejq1b4d

Enjoy! And thanks to Marek for his effort. Of course, thank you very much to SF team for programming an excellent engine such as StockFish is.

Regards from Spain.

Ajedrecista.

[MM]

Hello Mike:

I have problem connecting to .pl domains I guess.
Can we grab it in mediafire or some other sites with different URL without .pl

It seems that this file contains the sources. Mediafire link:

http://www.mediafire.com/?jf1omcgkejq1b4d

Enjoy! And thanks to Marek for his effort. Of course, thank you very much to SF team for programming an excellent engine such as StockFish is.

Regards from Spain.

Ajedrecista.

Sorry, i don't see the executable.

Regards

[Ajedrecista]

Hello Maurizio:

Marek said in the first post of this topic that he will try that Jim Ablett will do executables for Sting 1.0. In my previous post I reminded that this file onlycontains the source code (well, the only was not include). So, someone has to compile the source code for getting the executable. Please be patient.

Regards from Spain.

Ajedrecista.

[MM]

Hello Maurizio:

Marek said in the first post of this topic that he will try that Jim Ablett will do executables for Sting 1.0. In my previous post I reminded that this file onlycontains the source code (well, the only was not include). So, someone has to compile the source code for getting the executable. Please be patient.

Regards from Spain.

Ajedrecista.

Hello,

sorry, i misunderstood.
i hope it will be much stronger than SF.
Community needs new engines generation.

Thank you

Regards

[Jim Ablett]

Hi Marek,

I ask Jim Ablett to compile my project and to make it available for all (thanks in advance!):

Unfortunately I have an agreement with the Stockfish team only to compile the official Stockfish version,
but I wish you much success with your project.

Jim.

[lech]

Hi Marek,

I ask Jim Ablett to compile my project and to make it available for all (thanks in advance!):

Unfortunately I have an agreement with the Stockfish team only to compile the official Stockfish version,
but I wish you much success with your project.

Jim.

Hi Jim,
I expected this.
I realized myself elsewhere.
Now, it is a problem of all users only. Not mine.
Marek

BTW
The ELO of Sting is irrelevant to me.
Sting may be a new generation of engines, but it requires a lot of team work.
I hope that my idea will go to the others.

[rodolfoleoni]

Hi Marek,

I ask Jim Ablett to compile my project and to make it available for all (thanks in advance!):

Unfortunately I have an agreement with the Stockfish team only to compile the official Stockfish version,
but I wish you much success with your project.

Jim.

It's not easy to understand why this agreement could involve the Sting engine. Author has been respectful of glp rules and it's not an "unofficial" Stockfish as many others we recently saw. It's a legal derivative (as well as Tinapa). A fork, not a clone.

I hope Stockfish team will allow you to compile it.

[mcostalba]

Hi Marek,

I ask Jim Ablett to compile my project and to make it available for all (thanks in advance!):

Unfortunately I have an agreement with the Stockfish team only to compile the official Stockfish version,
but I wish you much success with your project.

Jim.

It's not easy to understand why this agreement could involve the Sting engine. Author has been respectful of glp rules and it's not an "unofficial" Stockfish as many others we recently saw. It's a legal derivative (as well as Tinapa). A fork, not a clone.

I hope Stockfish team will allow you to compile it.

We asked Jim to not compile sources directly downloaded from our repo to avoid fostering random bianaries of a still in development software. But we have nothing against derived engines of official release: sources based on an officially released version, like Stockfish 2.1.1, and then further modified by the author and, of course, with the name changed. I think Sting belongs to this second group.