Author: Robert Hyatt
Date: 07:50:06 09/09/04
Go up one level in this thread
On September 08, 2004 at 22:07:37, Michael Henderson wrote: >On September 08, 2004 at 19:59:57, Robert Hyatt wrote: > >>On September 07, 2004 at 23:56:26, Stuart Cracraft wrote: >> >>>On September 06, 2004 at 22:41:32, Robert Hyatt wrote: >>> >>>>On September 06, 2004 at 22:05:58, Stuart Cracraft wrote: >>>> >>>>>On September 06, 2004 at 18:33:47, Robert Hyatt wrote: >>>>> >>>>>>On September 06, 2004 at 04:47:12, Alessandro Scotti wrote: >>>>>> >>>>>>>On September 05, 2004 at 22:12:35, Stuart Cracraft wrote: >>>>>>> >>>>>>>>I walk the PV until there is no further position. No limit. This can then >>>>>>>>either be left in the hash table if you don't clear between searches >>>>>>>>but like Bob, you should keep the PV entries and restore them in the >>>>>>>>hash table before the next search whether or not you table-clear due to >>>>>>>>potential changes. >>>>>>>> >>>>>>>>I don't do this. It's a simple fix. I don't know why I've delayed putting >>>>>>>>it in. >>>>>>> >>>>>>>I don't either. But since I get my PV from the hash table, it's already there. >>>>>> >>>>>> >>>>>>It won't _always_ be there . That is the problem. You can overwrite a key >>>>>>position and lose a move in the PV, and hence the _rest_ of the PV will not be >>>>>>useful. >>>>> >>>>>I understand that. But unless you record the PV with an alternate technique, >>>>>you can't fill it since source == destination. >>>> >>>>I was assuming a non-flawed method of maintaining the PV. :) >>>> >>>> >>>> >>>>> >>>>>And I am not sure I want to do the triangular array gubbish. >>>> >>>> >>>>That's _the_ answer to do it right, however. And it is trivial to do. >>> >>>The method I saw at Bruce's webpage doesn't look great to me. >> >> >>In Crafty, it adds 3 lines of code to quiesce.c, and another three lines of code >>to the points in search.c where I return a value other than alpha or beta... > >Is he thinking it's slow? because it is not, i have done tests, < 1% speed >change. I think he was saying it was "messy to add the code"... it is harder to explain how to do it than it is to write the actual code to do it. :)
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