Author: Dave Gomboc
Date: 09:02:43 04/03/00
Go up one level in this thread
On April 03, 2000 at 09:37:55, Bernhard Bauer wrote: >On April 03, 2000 at 07:52:35, Jeremiah Penery wrote: > >>On April 03, 2000 at 07:35:44, guy haworth wrote: >> >>> >>>An interesting situation! >>> >>>On the one hand, if you assume that your opponent is infallible (e.g. HAS the >>>EGT), you will want to avoid the EGT situation. >> >>At least in my example case, the opponent wins easily if you avoid the TB >>position. :( Even in _less_ moves than the TB would have required, because he >>now has QNN vs. NP instead of only NN vs. P. >> >>>On the other hand, if you assume that your opponent might be fallible (i.e. does >>>not have the EGT) you could go - as you did with the hard-to-win 'EGT' situation >>>in preference to the other. >>> >>>If an 'infallible opponent' would also win the non-EGT situation, maybe it is a >>>'no brainer' situation but certainly one where you have to override the >>>computer's automatic avoidance of lost EGT-positions. >> >>It seems to be a problem of computers in general - they assume their opponent is >>always 'optimal' according to their own standards, and so they can get into >>trouble because of this. If the program searches 50 ply in the middlegame (a >>ridiculous example, I know, but it makes the point) and sees a spectacular >>winning combination for the opponent, it will sacrifice a piece immediately with >>a better score, but will go on to lose easily. It's possible that the opponent >>didn't even see the combination, and the piece loss wasn't necessary. A very >>interesting problem... >> >>Jeremiah > >Yes, a very interesting problem. Don't know what to do in such a situation. >The 100:1 time odds game between Crafty and Rebel comes to mind. >Crafty avoided lines that Rebel had no idea of - and lost. May be Crafty could >avoid the loss by playing non optimal lines. >Sometimes it's better to know less :-) >Kind regards >Bernhard I recall Bob and Ed debating at the time of the NPS match, and I think Bob thought this was happening, but I think Ed disagreed. Bob pointed out some instances where Crafty's material score was over 1.00 more negative than what Rebel reported, and Ed replied that his pawns were worth only 0.75 and that Rebel was seeing the win of the same amount of material than Crafty was seeing the loss of. Dave
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