Computer Chess Club Archives




Subject: Re: What to do with Horizon effect?

Author: Roberto Waldteufel

Date: 10:41:20 11/01/98

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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.


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