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Stockfish 1.7
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Dann Corbit



Joined: 08 Mar 2006
Posts: 5125
Location: Redmond, WA USA
PostPost subject: Re: Stockfish 1.7    Posted: Fri Apr 09, 2010 12:38 am Reply to topic Reply with quote
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!
Wink


Am I hearing some criticism here? This too simple Dann Smile ? 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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Subject Author Date/Time
Stockfish 1.7 Marco Costalba Thu Apr 08, 2010 5:29 am
      Re: Stockfish 1.7 Graham Banks Thu Apr 08, 2010 5:34 am
      Re: Stockfish 1.7 Aaron Becker Thu Apr 08, 2010 6:08 am
            Re: Stockfish 1.7 Gian-Carlo Pascutto Thu Apr 08, 2010 8:07 am
                  Re: Stockfish 1.7 Graham Banks Thu Apr 08, 2010 8:12 am
                        Re: Stockfish 1.7 Jeremy Bernstein Thu Apr 08, 2010 9:55 am
                        Re: Stockfish 1.7 Carl Bicknell Thu Apr 08, 2010 10:18 am
                  Re: Stockfish 1.7 Marco Costalba Thu Apr 08, 2010 11:11 am
                  Re: Stockfish 1.7 Gian-Carlo Pascutto Fri Apr 09, 2010 10:46 am
                        Re: Stockfish 1.7 Marco Costalba Fri Apr 09, 2010 10:51 am
                        Re: Stockfish 1.7 Tord Romstad Fri Apr 09, 2010 11:00 am
                        Re: Stockfish 1.7 Uri Blass Fri Apr 09, 2010 11:27 am
                              Re: Stockfish 1.7 mishmash Fri Apr 09, 2010 11:42 am
                        Re: Stockfish 1.7 Uri Blass Fri Apr 09, 2010 11:41 am
                        Re: Stockfish 1.7 Eelco de Groot Fri Apr 09, 2010 11:54 am
                              Re: Stockfish 1.7 Gian-Carlo Pascutto Fri Apr 09, 2010 2:04 pm
                                    Re: Stockfish 1.7 M ANSARI Fri Apr 09, 2010 2:59 pm
                                          Re: Stockfish 1.7 Gian-Carlo Pascutto Fri Apr 09, 2010 4:01 pm
                                          Re: Stockfish 1.7 Uri Blass Fri Apr 09, 2010 10:26 pm
                                                Re: Stockfish 1.7 john dalhem Sat Apr 10, 2010 12:12 am
                                                Re: Stockfish 1.7 M ANSARI Sat Apr 10, 2010 6:36 am
                                    Re: Stockfish 1.7 Marco Costalba Fri Apr 09, 2010 5:24 pm
      Re: Stockfish 1.7 Volker Pittlik Thu Apr 08, 2010 6:27 am
            Re: Stockfish 1.7 Norbert Raimund Leisner Thu Apr 08, 2010 6:36 am
                  Re: Stockfish 1.7 Marek Kwiatkowski Thu Apr 08, 2010 1:03 pm
      Re: Stockfish 1.7 Vael Jean-Paul Thu Apr 08, 2010 7:28 am
      Re: Stockfish 1.7 Frank Quisinsky Thu Apr 08, 2010 10:52 am
      Re: Stockfish 1.7 Uri Blass Thu Apr 08, 2010 5:42 pm
      Re: Stockfish 1.7 Horacio Montenegro Thu Apr 08, 2010 6:04 pm
            Re: Stockfish 1.7 Aaron Becker Thu Apr 08, 2010 7:57 pm
                  Re: Stockfish 1.7 Dann Corbit Thu Apr 08, 2010 9:22 pm
                        Re: Stockfish 1.7 Aaron Becker Thu Apr 08, 2010 9:56 pm
                              Re: Stockfish 1.7 Daniel Shawul Fri Apr 09, 2010 1:03 am
                        Re: Stockfish 1.7 Eelco de Groot Fri Apr 09, 2010 12:17 am
                              Re: Stockfish 1.7 Dann Corbit Fri Apr 09, 2010 12:38 am
      Re: Stockfish 1.7 James Constance Thu Apr 08, 2010 7:33 pm
            Re: Stockfish 1.7 BrandonSi Thu Apr 08, 2010 8:16 pm
                  Re: Stockfish 1.7 James Constance Fri Apr 09, 2010 1:42 pm
                        Re: Stockfish 1.7 Eelco de Groot Fri Apr 09, 2010 2:00 pm
                              Re: Stockfish 1.7 James Constance Fri Apr 09, 2010 6:00 pm
                                    Re: Stockfish 1.7 Marco Costalba Fri Apr 09, 2010 6:03 pm
                                          Re: Stockfish 1.7 James Constance Fri Apr 09, 2010 6:32 pm
                                                Re: Stockfish 1.7 Marco Costalba Fri Apr 09, 2010 6:39 pm
                                                      Re: Stockfish 1.7 James Constance Fri Apr 09, 2010 7:31 pm
      Re: Stockfish 1.7 john dalhem Thu Apr 08, 2010 7:49 pm
            Re: Stockfish 1.7 Louis Zulli Thu Apr 08, 2010 8:31 pm
                  Re: Stockfish 1.7 john dalhem Thu Apr 08, 2010 8:34 pm
                  Re: Stockfish 1.7 Tord Romstad Thu Apr 08, 2010 8:34 pm
                  Re: Stockfish 1.7 Peter C Thu Apr 08, 2010 8:37 pm
                        Re: Stockfish 1.7 Marco Costalba Thu Apr 08, 2010 9:05 pm
                              Re: Stockfish 1.7 Ted Summers Thu Apr 08, 2010 9:15 pm
                              Re: Stockfish 1.7 Christian Goralski Thu Apr 08, 2010 9:24 pm
                              Re: Stockfish 1.7 Benigno Hdez Bacallado Thu Apr 08, 2010 9:27 pm
                              Re: Stockfish 1.7 Werner Schüle Thu Apr 08, 2010 9:31 pm
                              Re: Stockfish 1.7 Louis Zulli Thu Apr 08, 2010 10:53 pm
                              Re: Stockfish 1.7 Miguel A. Ballicora Thu Apr 08, 2010 10:57 pm
                                    Re: Stockfish 1.7 Eelco de Groot Thu Apr 08, 2010 11:36 pm
                                    Re: Stockfish 1.7 Marco Costalba Fri Apr 09, 2010 5:36 am
                                          Re: Stockfish 1.7 Louis Zulli Fri Apr 09, 2010 6:32 am
                                          Re: Stockfish 1.7 Bigler Fri Apr 09, 2010 9:58 am
                                    Re: Stockfish 1.7 Tord Romstad Fri Apr 09, 2010 5:44 am
                              Re: Stockfish 1.7 Peter C Thu Apr 08, 2010 10:59 pm
                              Re: Stockfish 1.7 BrandonSi Fri Apr 09, 2010 12:26 am
                              Re: Stockfish 1.7 Paulo Soares Fri Apr 09, 2010 12:53 am
                              Re: Stockfish 1.7 Bigler Fri Apr 09, 2010 9:53 am
                              Re: Stockfish 1.7 Joerg Oster Fri Apr 09, 2010 6:39 pm
                                    Re: Stockfish 1.7 Marco Costalba Fri Apr 09, 2010 6:42 pm
                                          Re: Stockfish 1.7 Russell Murray Sat Apr 10, 2010 1:27 am
      Re: Stockfish 1.7 Benigno Hdez Bacallado Thu Apr 08, 2010 8:09 pm
            Re: Stockfish 1.7 Tord Romstad Thu Apr 08, 2010 8:14 pm
            Re: Stockfish 1.7 Louis Zulli Thu Apr 08, 2010 8:15 pm
            Re: Stockfish 1.7 Louis Zulli Thu Apr 08, 2010 8:21 pm
      Re: Stockfish 1.7 bigo Fri Apr 09, 2010 12:25 am
            Re: Stockfish 1.7 Uri Blass Fri Apr 09, 2010 12:57 am
      Re: Stockfish 1.7 Paulo Soares Fri Apr 09, 2010 12:28 am
      Re: Stockfish 1.7 john dalhem Fri Apr 09, 2010 1:24 am
            Re: Stockfish 1.7 john dalhem Fri Apr 09, 2010 4:03 am
                  Re: Stockfish 1.7 Marc MP Fri Apr 09, 2010 4:13 am
                  Re: Stockfish 1.7 Louis Zulli Fri Apr 09, 2010 6:13 am
      Re: Stockfish 1.7 Gary Fri Apr 09, 2010 5:40 am
            Re: Stockfish 1.7 Marco Costalba Fri Apr 09, 2010 6:01 am
                  Re: Stockfish 1.7 Gary Fri Apr 09, 2010 6:10 am
                        Re: Stockfish 1.7 Gary Fri Apr 09, 2010 6:48 am
                              Re: Stockfish 1.7 Josh Manion Fri Apr 09, 2010 7:08 am
                              Re: Stockfish 1.7 Gary Fri Apr 09, 2010 7:12 am
      Re: Stockfish 1.7 Alex Lobanov Fri Apr 09, 2010 7:23 am
            Re: Stockfish 1.7 Swaminathan Fri Apr 09, 2010 7:36 am
                  Re: Stockfish 1.7 Jeremy Bernstein Fri Apr 09, 2010 7:46 am
                        Re: Stockfish 1.7 sitwala mungunda Fri Apr 09, 2010 9:07 am
                              Re: Stockfish 1.7 Jeremy Bernstein Fri Apr 09, 2010 9:16 am
                                    Re: Stockfish 1.7 sitwala mungunda Fri Apr 09, 2010 9:43 am
                                          Re: Stockfish 1.7 Jeremy Bernstein Fri Apr 09, 2010 9:47 am
                                          Re: Stockfish 1.7 Dr.Wael Deeb Fri Apr 09, 2010 10:01 am
                                                Re: Stockfish 1.7 sitwala mungunda Fri Apr 09, 2010 12:12 pm
                                                      Re: Stockfish 1.7 BrandonSi Fri Apr 09, 2010 1:01 pm
                                                            Re: Stockfish 1.7 sitwala mungunda Fri Apr 09, 2010 1:24 pm
                                                      Re: Stockfish 1.7 Uri Blass Fri Apr 09, 2010 1:52 pm
                                                            Re: Stockfish 1.7 Milos Stanisavljevic Fri Apr 09, 2010 1:56 pm
                                                            Re: Stockfish 1.7 Swaminathan Fri Apr 09, 2010 3:33 pm
                                    Re: Stockfish 1.7 Uri Blass Fri Apr 09, 2010 10:26 am
                                          Re: Stockfish 1.7 Jeremy Bernstein Fri Apr 09, 2010 10:42 am
      Re: Stockfish 1.7 Osipov Jury Fri Apr 09, 2010 2:03 pm
            Re: Stockfish 1.7 Milos Stanisavljevic Fri Apr 09, 2010 2:45 pm
                  Re: Stockfish 1.7 Osipov Jury Fri Apr 09, 2010 3:01 pm
                        Re: Stockfish 1.7 Milos Stanisavljevic Fri Apr 09, 2010 3:29 pm
                              Re: Stockfish 1.7 Osipov Jury Fri Apr 09, 2010 4:46 pm
      Re: Stockfish 1.7 Ingo Bauer Fri Apr 09, 2010 7:32 pm
            Re: Stockfish 1.7 Marco Costalba Fri Apr 09, 2010 7:44 pm
                  Re: Stockfish 1.7 Dr.Wael Deeb Fri Apr 09, 2010 7:52 pm
                  Re: Stockfish 1.7 Ingo Bauer Fri Apr 09, 2010 7:52 pm
                  Re: Stockfish 1.7 Zagalo Martini Fri Apr 09, 2010 8:46 pm
                  Re: Stockfish 1.7 Gian-Carlo Pascutto Sat Apr 10, 2010 10:52 am
            Re: Stockfish 1.7 Tord Romstad Fri Apr 09, 2010 8:15 pm
                  Re: Stockfish 1.7 Uri Blass Fri Apr 09, 2010 8:25 pm
                  Re: Stockfish 1.7 Ingo Bauer Fri Apr 09, 2010 8:36 pm
            Re: Stockfish 1.7 Joona Kiiski Sat Apr 10, 2010 6:31 am
                  Re: Stockfish 1.7 Ingo Bauer Sat Apr 10, 2010 7:50 am
                  Re: Stockfish 1.7 Milos Stanisavljevic Sat Apr 10, 2010 11:00 am
      Re: Stockfish 1.7 Michael Golub Sat Apr 10, 2010 12:11 pm
            Re: Stockfish 1.7 Tord Romstad Sat Apr 10, 2010 12:19 pm
                  Re: Stockfish 1.7 Michael Golub Sat Apr 10, 2010 3:16 pm
                        Re: Stockfish 1.7 Milos Stanisavljevic Sat Apr 10, 2010 3:34 pm
                        Re: Stockfish 1.7 Joona Kiiski Sat Apr 10, 2010 4:36 pm
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