Author: Ricardo Gibert
Date: 05:30:05 01/21/03
Go up one level in this thread
On January 21, 2003 at 07:48:51, James T. Walker wrote: >Here is the analysis by Fritz 8. The first few moves are perfect and I really >believe that Fritz 8 would win this ending easily. > >New game >8/1p1R2pk/5p2/7P/7P/5Kn1/4r3/8 b - - 0 1 > >Analysis by Fritz 8: > >1...b5 2.Rb7 Re5 3.Kxg3 Rxh5 4.Kg4 Kg6 5.Kf3 > -+ (-1.47) Depth: 7/14 00:00:00 28kN >1...Re8 2.Kxg3 Rb8 3.Rd4 b5 4.Rb4 Kh6 5.Kg4 > -+ (-1.88) Depth: 8/16 00:00:00 51kN >1...Re8 2.Kxg3 Rb8 3.Rd4 b5 4.Rb4 Kh6 5.Kg4 > -+ (-1.88) Depth: 8/16 00:00:00 51kN >1...Re8 2.Kxg3 Rb8 3.Rd4 b5 4.Rb4 Kh6 5.Kg4 > -+ (-1.88) Depth: 8/16 00:00:00 51kN >1...Re8 2.Kxg3 Rb8 3.Rd4 b5 4.Rb4 Kh6 5.Kg4 Rb7 > -+ (-1.81) Depth: 9/17 00:00:00 101kN >1...Re8 2.Kxg3 Rb8 3.Rd4 b5 4.Rb4 Kh6 5.Kg4 Rb7 6.Re4 > -+ (-1.97) Depth: 10/21 00:00:00 208kN >1...Re8! > -+ (-2.25) Depth: 11/20 00:00:00 409kN, tb=2 >1...Re8 2.Kxg3 Rb8 3.Rd4 b5 4.Rb4 Kh6 5.Kg4 > -+ (-2.19) Depth: 12/20 00:00:01 832kN, tb=17 >1...Re8-- > -+ (-1.91) Depth: 13/24 00:00:02 1749kN, tb=171 >1...Re8 2.Kxg3 Rb8 > -+ (-1.91) Depth: 13/25 00:00:03 1927kN, tb=174 >1...Re8! > -+ (-2.19) Depth: 14/25 00:00:06 4103kN, tb=595 >1...Re8-- > -+ (-1.91) Depth: 15/26 00:00:12 7285kN, tb=2014 >1...Re8 2.Kxg3 Rb8 > -+ (-1.91) Depth: 15/26 00:00:13 7914kN, tb=2061 >1...Re8! > -+ (-2.19) Depth: 16/28 00:00:26 17073kN, tb=5446 >1...Re8! > -+ (-2.47) Depth: 17/32 00:00:49 30631kN, tb=13041 >1...Re8 2.Kxg3 Rb8 3.Kf4 b5 4.Ke3 b4 5.Kd2 b3 6.Kc1 b2+ 7.Kb1 Kh6 8.Rd5 Rb7 >9.Rc5 Rb6 10.Rd5 Rb3 > -+ (-2.34) Depth: 18/33 00:01:34 63970kN, tb=32815 >1...Re8 2.Kxg3 Rb8 3.Kf4 b5 4.Ke3 b4 5.Kd2 b3 6.Kc1 b2+ 7.Kb1 Kh6 8.Rd5 Rb7 >9.Rc5 Rb6 10.Rd5 Rb8 > -+ (-2.41) Depth: 19/54 00:03:09 144284kN, tb=78986 > >(, 21.01.2003) This PV is garbage. All this shows is that F8 likes 61...Re8, because all it could find was a weak defense for White (63. Kf4), which does zip to resist the formation of connected passed pawns on the K-side for Black. Like I said, chess programs are clueless when it comes to Rook endings. Also, the fact that it does not switch to 61...Re8 until ply 8 is suggests that it likes 61...Re8 for the wrong reasons. The basic problem with Rook endings for programs is that they are strategic in nature and to make up the difference, programs need to calculate to a depth that is beyond what they can do. Just adding a bonus for getting a Rook behind a passed Pawn is not enough, because it happens often enough that this is not even the right idea and that bonus will then work against the program instead of for it.
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