Author: Drexel,Michael
Date: 13:25:44 10/18/05
Go up one level in this thread
On October 18, 2005 at 15:02:20, Uri Blass wrote: >On October 18, 2005 at 14:49:41, chandler yergin wrote: > >>On October 18, 2005 at 12:11:56, Drexel,Michael wrote: >> >>>[D]1n1r3k/1p1n4/2p5/8/3B4/8/4K3/R7 b - - 0 1 >>> >>>Analysis by Fritz 9: >>> >>>5...Se5 6.Lc3 b5 7.Ta7 Kg8 8.Tc7 Te8 >>> ³ (-0.34) Depth: 7/19 00:00:00 72kN >>>5...Se5 6.Lc3 b5 7.Ta8 Kh7 8.Ta5 Sd3 9.Ke3 >>> ³ (-0.37) Depth: 8/19 00:00:00 169kN >>>5...Se5 6.Lc5 b5 7.Le7 Te8 8.Lf6+ Kh7 9.Kd2 Sbd7 10.Th1+ Kg6 >>> ³ (-0.38) Depth: 9/28 00:00:00 490kN >>>5...Se5 6.Lc3 b5 7.Tb1 Kh7 8.La1 Sa6 9.Lc3 Kg6 10.Th1 >>> ³ (-0.38) Depth: 10/26 00:00:00 1234kN >>>5...Se5 6.Lc3 b5 7.Ta7 Sa6 8.Kf1 c5 9.Ke2 Kg8 10.Tb7 Sc7 >>> ³ (-0.38) Depth: 11/29 00:00:01 2285kN >>>5...Se5 6.Lc3 b5 7.Th1+ Kg8 8.Tb1 Td3 9.La1 Sbd7 10.Tb4 Kf7 11.Lb2 >>> ³ (-0.40) Depth: 12/30 00:00:04 6291kN >>>5...Se5 6.Lc3 b5 7.Th1+ Kg8 8.Tb1 Kf7 9.La5 Td3 10.Lc7 Sbd7 11.Tb4 Kg6 >>> ³ (-0.41) Depth: 13/40 00:00:11 15607kN >>>5...Se5 6.Lc3 b5 7.Th1+ Kg8 8.Tb1 Kf7 9.Tf1+ Ke6 >>> ³ (-0.43) Depth: 14/38 00:00:30 42044kN >>>5...Se5 6.Lc3 b5 7.Th1+ Kg8 8.Tb1 Kf7 9.Tf1+ Ke6 >>> ³ (-0.43) Depth: 14/46 00:01:27 121127kN >>> >>>This is not supposed to be the Giveaway chess engine :) >> >>It's not, and it's not a Bug. >>Right click in your analysis window, you will get a menu >>One of the selections is 'scroll main line' >>If this is checkmarked you will get what you posted. >>Click on 'scroll main line again', this deactivates it, and you will see the >>normal PV Analysis. > >The problem is that Fritz9 choose Ne5 that is a stupid move that gives a piece >for nothing and I do not see what it has to do with scroll main line. > >It seems that it has a bug in evaluating some positions when one side is piece >and 2 pawns down This kind of wrong evaluation can happen with 1,2,...,8 pawns down, not only with 2 pawns down. [d]1n1r2k1/3b4/8/8/8/8/1B2K3/R7 b - - 0 5 Fritz 8 evaluated this position about -3. Now Fritz 9 says its a draw. I guess there went something badly wrong with the new insufficient material implementation. If this is correct it would mean the Bug can only happen in the endgame. This would explain why the engine performed very good in tests so far. The positions which are completey wrong evaluated by Fritz 9 do not happen very often in games and only sometimes it will lead to a huge blunder. Michael and it evaluate them as close to draw. > >Uri
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