Author: Vincent Diepeveen
Date: 05:17:49 08/07/99
Go up one level in this thread
On August 05, 1999 at 22:43:29, Robert Hyatt wrote: >On August 05, 1999 at 17:13:28, Tom King wrote: > >>On August 04, 1999 at 20:00:49, Robert Hyatt wrote: >> >>[snip] >>> >>> >>>I find the following: >>> >>>using SEE to order captures in the q-search, without eliminating any, will >>>shrink the tree about 10% over using something simple like MVV/LVA. But the >>>SEE code will likely cost you more than 10% (unless you are a bitmap program >>>where this can be done fairly efficiently). >>> >>>using SEE to eliminate losing captures can speed you up another 50%, or a factor >>>of two, which is very significant. And no matter how slow your SEE code is, >>>that become a 'winner' of an idea. >> >>I'm seeing a big speedup - it's just the (possible) loss of accuracy which >>concerns me. Having said that, my Q search is pretty "quick and nasty" anyway, >>although I do still do things like probe the hash tables. > > >This is only my opinion, but I spend my time working on the full-width part of >the search (extensions, etc.). The q-search already has _so many_ errors in it >(it is highly selective since throwing out everything but captures is a drastic >step, of course) that I don't trust it at all. I just want it to handle simple >hung pieces and not much else... I'll trust my extensions to find the deep >tactical tricks since then I won't be overlooking pins, forks, skewers, etc. > >When you think about it like that, shrink the q-search and use those nodes in >places where they are more useful. > >Just an opinion, of course... Right, my opinion is different. A good qsearch will give more accurate scores for leafs, so in a set of leafs X, for all leafs x in X we will have a more reliable score. So whatever plydepth we get, we will get a positional more trustworthy score, which with backtracking will result in a better and more reliable score. Greetings, Vincent
This page took 0.02 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.