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Dann Corbit

Joined: 08 Mar 2006
Posts: 5125
Location: Redmond, WA USA

Post subject: Re: Stockfish 1.7    Posted: Fri Apr 09, 2010 12:38 am

Eelco de Groot wrote:
Dann Corbit wrote:
Aaron Becker wrote:
 nepossiver wrote: Was Dann Corbit smooth scaling introduced into the source? I remember the few tests done showed either no difference or a 20-30 increase in ELO (which is what I found in 1+1 games).

Here is the new nullmove depth reduction calculation:

 Code: // Null move dynamic reduction based on depth         int R = 3 + (depth >= 5 * OnePly ? depth / 8 : 0);         // Null move dynamic reduction based on value         if (refinedValue - beta > PawnValueMidgame)             R++;

I don't know how close this is to Dann's formulation.

it's a new and very interesting idea (I never saw it before) that will prune more and more aggressively as a function of existing search depth.

For instance, if you are at a depth of 32, R would be 3+4=7.
Did you ever see a 7 ply reduction before? It's the most unheard of thing I have ever heard of!

Am I hearing some criticism here? This too simple Dann ? You want to do a reduction of seven plies only for very promising moves and the rest should be reduced by cos²ln√π(α + Δ(approximateEval - β) + depth) + log(number of days between Easter 2010 and the start of the new Mayan calendar)?

I'm sure we can arrange that!

We can nullmove, faster, deeper, better than anybody in the business regards,

Eelco

I am interested to try also a factor that depends on mobility, but for the current stockfish, it seems that it is only available for the root move search.
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Dann Corbit Thu Apr 08, 2010 9:22 pm
Aaron Becker Thu Apr 08, 2010 9:56 pm
Daniel Shawul Fri Apr 09, 2010 1:03 am
Eelco de Groot Fri Apr 09, 2010 12:17 am
Re: Stockfish 1.7 Dann Corbit Fri Apr 09, 2010 12:38 am
James Constance Thu Apr 08, 2010 7:33 pm
BrandonSi Thu Apr 08, 2010 8:16 pm
James Constance Fri Apr 09, 2010 1:42 pm
Eelco de Groot Fri Apr 09, 2010 2:00 pm
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