Author: Dusan Dobes
Date: 13:49:53 01/08/99
Go up one level in this thread
On January 08, 1999 at 04:22:09, Howard Exner wrote:
>b5k1/7p/4p1pP/4P1P1/8/8/8/N5K1 w
>
>Here is a position based on a game between Cm6000 and Fritz 5.32.
>( the recent game with the move d3 thread).
>I created this position to see if Chess programs have
>an accurate assessment of the relative values that the Bishop and
>Knight have. Material is equal yet all endgame authors I've read usually
>comment on positions like this in the following manner - "White has
>a huge advantage as all the pawns are on the same side of the board.
>Furthermore whites pawns cannot be attacked and once the powerfull
>white Knight reaches f6 the game will be over."
>
>
>How will programs eventually come to deal with assessing this position
>correctly? Will this be a kind of position that programs will never
>quite understand? Do any programs penalize the bishop here or
>conversely, give the Knight extra value in this position?
My program (Phalanx XX) penalizes black pawns blocked on light squares
as black has light squared bishop. It also understands d6 and f6 as
strong outposts for knight because these are protected by white pawns
and black cannot attack these squares with pawns or minors. Phalanx
evaluates this position only +0.70 in search depth 14,15,16,17, then it
finds a knight path to f6. I have run it on a Pentium/150, 12MB hash
(depth 1 to 16 deleted):
17 70 14302 3721078 Na1-c2 Ba8-e4 Nc2-e3 Be4-f5 Kg1-f2 Kg8-f8
Ne3-c4 Kf8-e8 Nc4-d6
17 71 19582 5142019 Na1-b3 Kg8-f7 Kg1-f2 Ba8-d5
17 -> 4:08.69 6689536 1 turn
18 86 35079 9280730 Na1-b3 Kg8-f7 Kg1-f2 Ba8-d5 Nb3-c5 Kf7-e7
Kf2-e3 Bd5-g2 Ke3-f4 Bg2-c6 Nc5-d3 Ke7-d7
Nd3-f2
18 -> 6:15.22 9956693 0 turns
19 93 53185 14285075 Na1-b3 Kg8-f7 Kg1-f2 Ba8-d5 Nb3-c5 Kf7-e7
Kf2-e3 Bd5-g2 Ke3-f4 Bg2-c6 Nc5-d3 Ke7-f7
Nd3-f2 Kf7-f8 Nf2-g4 Kf8-g8 Ng4-f6 Kg8-h8
Kf4-e3 Bc6-d5
19 -> 9:26.21 15280078 0 turns
20 98 82221 21972123 Na1-b3 Kg8-f7 Kg1-f2 Ba8-d5 Nb3-c5 Kf7-e7
Kf2-e3 Bd5-g2 Ke3-f4 Bg2-d5 Nc5-d3
20 -> 14:46.71 23689155 0 turns
21 100 156617 41742432 Na1-b3 Kg8-f7 Kg1-f2 Ba8-d5 Nb3-c5 Kf7-e7
Kf2-e3 Bd5-g2 Ke3-f4 Bg2-d5 Nc5-d3 Ke7-f7
Nd3-f2 Kf7-g8 Nf2-g4 Kg8-h8 Kf4-e3 Bd5-c4
Ke3-d4 Bc4-d5
21 -> 28:14.75 45060511 0 turns
Dusan Dobes
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