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Subject: Re: What to do with Horizon effect?

Author: Robert Hyatt

Date: 13:32:02 11/01/98

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On November 01, 1998 at 13:41:20, Roberto Waldteufel wrote:

>On November 01, 1998 at 10:20:02, Amir Ban wrote:
>>On October 31, 1998 at 17:50:48, Robert Hyatt wrote:
>>>not much you can do...  horizon effect happens anytime you stop the search
>>>in a non-quiet position...  everybody sees it...  just get faster.. :)
>>I don't agree with this statement. The exposure to horizon effects is what
>>usually limits a program's strength, more than the depth it can reach. The fact
>>that it cannot be totally overcome is irrelevant to the fact that limiting its
>>damage is a first priority. Just getting generally deeper is a poor way to do
>>that, and not very effective either.
>So what do you do to "limit the damage" of the horizon effect. Do you perform
>any special quiescence tests other than following captures/pawn promotions and
>perhaps a few checks beyond the main search? Whereas it may be a crude solution
>to try to "outrun" the horizon with fast searching, it is the only practical
>solution of which I am aware. Greater depth makes it less likely, but never
>impossible, for a horizon misevaluation to propogate back to the root.

he likely does the same thing all of us do... extend checking moves, capture
moves, passed pawn pushes and so forth.  But it doesn't matter what you do,
the problem doesn't go away... see the position I posted already in this thread.
It's a cute one...

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