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Verification search
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Vincent Diepeveen



Joined: 09 Mar 2006
Posts: 1738
Location: The Netherlands
PostPost subject: Re: Verification search    Posted: Sun Jun 24, 2012 10:32 am Reply to topic Reply with quote
lkaufman wrote:
diep wrote:

You see typically Houdini picks up massive elo by not needing a too extreme search depth there either to find it. It needs a minute or 90 for such positions. Basically what Houdini doesn't find within 3 minutes, it's going to find slower than Diep,Hiarcs,DeepJunior it seems.

Now the evaluation of all those rybka type clones is similar if not the same, so that ain't the difference. If you compare it with Ivanhoe, ivanhoe is 100% the same, yet needs factor 4 more in time to find the same best moves.


How is it possible that Ivanhoe and Houdini are "100% the same, yet (Ivanhoe) needs factor 4 more in time..."? Can you offer any theory that could explain this paradox? I think on average the factor is about 2, not 4, but still, the paradox remains.


Evaluation is 100% the same. Search is slightly different.

It's not a paradox. Just a small change in search can total cripple you or make you better.

Ivanhoe searches 2 ply deeper than houdini 1.5a here does. Yet it needs factor 4 more TIME to find on average deep difficult to find moves. Usually deep tactics.

That factor 4 has nothing to do with branching factor. It's actually requiring easily on average 4-6 ply more than houdini.

Ivanhoe versus Houdini is the perfect example to show that just forward pruning everything in order to get another 2 ply deeper isn't the holy grail of computerchess.
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Display posts from previous:   
Subject Author Date/Time
Verification search Lucas Braesch Thu Jun 14, 2012 1:07 pm
      Re: Verification search Robert Hyatt Thu Jun 14, 2012 1:19 pm
            Re: Verification search Pawel Koziol Thu Jun 14, 2012 2:54 pm
            Re: Verification search Lucas Braesch Fri Jun 15, 2012 4:00 am
                  Re: Verification search Eelco de Groot Fri Jun 15, 2012 12:54 pm
                  Re: Verification search Daniel Homan Fri Jun 15, 2012 3:00 pm
                  Re: Verification search Lucas Braesch Sat Jun 16, 2012 3:18 am
                        Re: Verification search Vincent Diepeveen Thu Jun 21, 2012 2:47 pm
                              Re: Verification search Larry Kaufman Sat Jun 23, 2012 5:06 am
                                    Re: Verification search Vincent Diepeveen Sun Jun 24, 2012 10:32 am
                                          Re: Verification search Larry Kaufman Sun Jun 24, 2012 2:40 pm
                                                Re: Verification search Vincent Diepeveen Tue Jun 26, 2012 10:40 am
                                                      Re: Verification search Don Dailey Tue Jun 26, 2012 11:09 am
                                                            Very minor verification search modification. Eelco de Groot Tue Jun 26, 2012 4:47 pm
                                                                  Re: Very minor verification search modification. Vincent Diepeveen Wed Jun 27, 2012 1:30 am
                  Re: Verification search Vincent Diepeveen Sat Jun 16, 2012 2:58 pm
      Re: Verification search Karlo Bala Jr. Fri Jun 15, 2012 7:30 am
            Re: Verification search Lucas Braesch Fri Jun 15, 2012 11:02 am
                  Re: Verification search Pawel Koziol Fri Jun 15, 2012 12:13 pm
                  Re: Verification search Karlo Bala Jr. Fri Jun 15, 2012 1:58 pm
      Re: Verification search J. Wesley Cleveland Sat Jun 16, 2012 12:12 am
      Re: Verification search Don Dailey Sat Jun 16, 2012 10:32 pm
            Re: Verification search Lucas Braesch Sun Jun 17, 2012 3:13 am
                  Re: Verification search Don Dailey Sun Jun 17, 2012 3:41 am
                  Re: Verification search Miguel A. Ballicora Sun Jun 17, 2012 4:21 am
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