Author: Thorsten Czub
Date: 10:19:01 08/26/98
Go up one level in this thread
On August 26, 1998 at 12:31:13, Robert Hyatt wrote: >Here I disagree. I have versions of Crafty that won't touch Qxg7... the ones >playing in Paris are good examples... but they don't play that well either, >because they get over-concerned about king safety... > >My interest in such positions would be for programs that don't play Qg7 when >the attack on the g-file will work, but which do play it when the attack won't >work. I'd bet that you can move a piece or two around, so that the g-file ends >up being useless, and these same programs will still avoid taking the pawn. Now >for the *wrong* reasons... In CSTal e.g. part of the evaluation-functions are connected to other parts. It does not play a move BECAUSE THE G-FILE IS OPEN alone. The evaluation parts are connected with each other. There must be few more criteria to be fullfilled... and in this position THESE criteria are realized. 1.The g-file is open 2.white is developed weak 3.black has bishop pair 4.white has (after g3) a finachetto king-position without having a fianchetto-bishop, meanwhile BLACK has the bishop AND the queen !! 5.both bishops x-ray on the king. 6.the more pawns black would eat (f7/g7/h7), the more would this HELP black. CSTal knows this. I am sure chris could tell you better how many of those criteria are fullfilled. It is not ONE alone. >So it isn't a breakthrough to not take such pawns, *unless* it is not taken for >the right reasons. How do you know that cstal is taking it for wrong reason ?! Do you want to see the main-line and evaluation of cstal win95 after Qxg7 to be sure ?! > Here, I bet that is not the case... And I'm not saying the >reasons for not taking are all wrong... but when such "intuition" is embedded >into a program, it often leads to problems... Ah. thats what we are working on. We are trying to implement complex evaluation terms that are related to each other. Like experience in the mind of a human. And these connections make sure not ONE reason will cause ONE reaction. Only if some reasons appear, cstal begins to sac or to increase tal or whatever. But not ONE g-file. I can show you many positions where cstal eats this pawn, because in those positions it is ok. In this position it is NOT ok. > because for every case it is >wrong, another opponent will push you into such situations and let the error >lead to a loss... Zugzwang lost with such a stupid queen move in paderborn against tiger. I have quoted the game. Rainer Feldmann told me they have thrown out the queen-malus for early opening-takes-on b7/g7 pawns. So - at least for zugzwang a knowledge lack caused it... >If anyone is interested, we could take the position, and start subtly changing >it and see how the programs fare then... Ok. If you want i am ready. Please PGN (with FEN)... that i can easily test with fritz... :-))
This page took 0 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.