Author: Michael Diosi
Date: 06:52:53 01/30/06
Go up one level in this thread
On January 30, 2006 at 09:35:38, Uri Blass wrote: >On January 30, 2006 at 09:08:09, Michael Diosi wrote: > >>On January 30, 2006 at 08:58:24, Uri Blass wrote: >> >>>On January 30, 2006 at 08:51:12, Uri Blass wrote: >>> >>>>On January 30, 2006 at 08:40:09, Uri Blass wrote: >>>> >>>>>On January 30, 2006 at 07:49:53, Michael Diosi wrote: >>>>> >>>>>> >>>>>>Hello. >>>>>> >>>>>>I have a few, this one is from Russel/ Norvig : Advances in Artificial >>>>>>Intelligence A Modern Approach (page 130) >>>>>>[d]8/1p1P4/k1p5/8/8/3PPPPP/r7/7K b - - 0 1 >>>>>> >>>>>>You can see here that black can give a series of checks "pushing" the inevitable >>>>>>queening over the horizon. So programs how don't see it will have a positive >>>>>>score for black. >>>>>> >>>>>> >>>>>>I can look for more if you want. >>>>>> >>>>>>MD >>>>> >>>>>This is a bad example >>>>> >>>>>Amir Ban is correct. >>>>> >>>>>The horizon effect is effect that cause the program to play worse move because >>>>>it does not see deep enough. >>>>> >>>>>This example is not the horizon effect but only not seeing deep enough. >>>>> >>>>>Uri >>>> >>>>Note that not every case that the program play worse move because of not seeing >>>>deep enough means the horizon effect. >>>> >>>>The idea is that the program has some illusion that it can prevent some problem >>>>but only cause itself a bigger problem because it delay the problem to position >>>>that it does not see. >>>> >>>>In the example the program has an illusion that it can prevent the pawn from >>>>promotion but it does not cause it to do mistakes and sacrifice material so I do >>>>not think that it is good example. >>>> >>>>Without check extensions if the program sacrifice the rook then it can be a good >>>>example. >>>> >>>>Uri >>> >>>The following sentence from the article summerize it: >>> >>>"The horizon effect is said to occur when >>>the delaying moves unnecessarily >>>weaken the position or give up additional material >>>to pospone the evantual loss" >>> >>>Uri >> >>Hi, >> >>This is exactly what its happenening. It is delaying moves unnecessarily giving >>checks and in the end material (the rook). The pawn promoting move is beyond the >>horizon of the program (not really in this case). In other words the program >>can't see that white will promote anyway. Each black move brings white closer to >>promotion and to the horizon. >> >> >> >>MD > >The delaying checks in your example do not weaken the position and there is >simply no better choice. > >Uri Hi, Hmm I still think it was a good example but how about this one then: [d]8/6k1/6p1/5p2/1p2p3/1P6/b1PK3R/8 w - - 0 1 http://www.ics.uci.edu/~eppstein/180a/990204.html MD
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