Author: Robert Hyatt
Date: 08:52:53 01/30/06
Go up one level in this thread
On January 30, 2006 at 03:59:07, Renze Steenhuisen wrote: >On January 29, 2006 at 23:10:30, masros tukiran wrote: > >>What is phenomenon called "horizon effect" in chess computer?.I don't >>understand what it is.Can somebody give me an example to desribe it.Thank you. > >You can only make a decision based on what you know, see, or so. >It is not different with computers. >When something is unknown to you but would have changed your decision if you >knew, then going from the situation that you don't know to the state that you >do know is called horizon effect. > >Or sometimes people call the horizon effect just the former situation, that a >wrong decission is made because the engine is uninformed, or at least >under-informed. > >Cheers, > >Renze Not quite correct. The "horizon effect" is something caused by a fixed search horizon that the search can't penetrate. If the search can therefore force something out beyond the horizon, in effect "delaying the problem for a while" that delaying can appear to be a "permanent solution" to the problem, since if the problem is pushed beyond the horizon, so far as the search is concerned, the problem no longer exists. search extensions are one way to mitigate this, but it is impossible to eliminate. These "big searches" are quite good at pushing things off far enough that they appear to disappear, only to come back on the next move...
This page took 0.01 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.