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Subject: Re: Why is this position so difficult to evaluate?

Author: Graham Laight

Date: 01:52:57 01/11/00

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On January 10, 2000 at 17:32:56, Torstein Hall wrote:

>
>From the game Shebarkov - Rebel.
>
>Why is it so difficult for a program to see a bad bishop?
>
>[D] 8/p3kp2/2pr1pb1/2b1p3/P3P1Pp/1PNB1P1P/2K5/3R4 w - - 0 26
>
>Torstein

What surprises me, and I suspect will surprise other observers as well, is that
I assumed that a big part of the eval would be piece mobility.

Looking at the diagram above, one would assume that Rebel wouldn't like to play
itself into that position on the basis of poor piece mobility.

-g

>Shebarkov - Rebel [D17]
>
>1.d2-d4 d7-d5 2.c2-c4 c7-c6 3.Ng1-f3 Ng8-f6 4.Nb1-c3 d5xc4 5.a2-a4 Bc8-f5
>6.Nf3-e5 e7-e6 7.f2-f3 Bf8-b4 8.Bc1-g5 h7-h6 9.Bg5-h4 c6-c5 10.d4xc5 Qd8-a5
>11.Qd1-d4 Nb8-c6 12.Ne5xc6 b7xc6 13.e2-e4 Bb4xc5 14.Qd4xc4 Bf5-g6 15.Qc4-a6
>Qa5xa6 16.Bf1xa6 Ra8-b8 17.Bh4xf6 g7xf6 18.0-0-0 Ke8-e7 19.Kc1-c2 Rh8-d8
>20.Rd1xd8 Rb8xd8 21.Ba6-d3 e6-e5 22.g2-g4 h6-h5 23.h2-h3 h5-h4 24.Rh1-d1 Rd8-d4
>25.b2-b3 Rd4-d6 26.Nc3-e2 Bc5-e3 27.Bd3-a6 Rd6xd1 28.Kc2xd1 Ke7-d7 29.Kd1-c2
>Kd7-c7 30.b3-b4 Be3-g5 31.Ba6-c4 Kc7-d6 32.Kc2-d3 Kd6-d7 33.Ne2-c3 Bg5-h6
>34.Nc3-b1 Bh6-f8 35.Kd3-c3 Kd7-d6 36.Nb1-d2 Bf8-h6 37.Kc3-d3 Kd6-c7 38.Bc4-b3
>Bh6-f8 39.Kd3-c4 Bf8-g7 40.Kc4-d3 Kc7-d7 41.Nd2-c4 Bg7-f8 42.Kd3-c3 Bf8-h6
>43.a4-a5 Kd7-c7 44.Bb3-a4 Bh6-f4 45.a5-a6 Bf4-g3 46.Kc3-d2 Bg3-f2 47.Nc4-a5
>c6-c5 48.b4-b5 Bf2-g1 49.Kd2-d3 Kc7-b6 50.Na5-c4+ Kb6-c7 51.Ba4-b3 Kc7-b8
>52.b5-b6 a7xb6 53.Nc4-d6 Kb8-a7 54.Bb3-c4 b6-b5 55.Bc4xb5 c5-c4+ 56.Kd3xc4
>Bg1-e3 1-0



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