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Subject: Re: Good (IMO) Endgame test

Author: Richard Pijl

Date: 04:25:03 01/08/03

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On January 07, 2003 at 11:47:41, Drexel,Michael wrote:

>[D] 1r4k1/pp1R2p1/2n1p2p/8/8/2b1B1PP/P4PB1/6K1 w - - 0 23
>
>IMHO this was the key moment of Kramnik-DF match last October. Kramnik blundered
>his winning chances away with 23.Bxc6. Dorian Rogozenko (not a top
>grandmaster, but strong anyway) criticized this move after the 4th game on
>chessbase server.
>23.Kf1 seems to be better, even in case black is able to defend this. can your
>programs avoid 23.Bxc6?
>

Baron 0.99.4 beta 4 avoids Bxc6 from the start. It presents another option
though: 23.f4
Baron switches a few times between 23.f4 and 23.Be4, then choses 23.a4 and later
23.Kf1, and back to 23.a4 (Mobile PII-500). Because of this (and because of the
slow computer used) I let it run for quite a while:

 ply       time     nodes  score  pv

  4( 7)&      0      4023    102  f2f4 h6h5 g2e4 g8f8
  4( 7).      0      5593    102  f2f4 h6h5 g2e4 g8f8
  5( 9)&      0     17863     94  f2f4 c3a5 g2c6 b7c6 d7a7 a5c3
  5( 9)&      0     28488     95  g2e4 e6e5 f2f3 c3d4 e3d4
  5( 9).      0     31232     95  g2e4 e6e5 f2f3 c3d4 e3d4
  6(10)&      0     55783     88  g2e4 e6e5 e4d5 g8h8 g1g2 c3d4 e3d4
  6(13)&      0    102016     94  f2f4 e6e5 f4e5 c3e5 g3g4 a7a6 g2c6
  6(13).      1    125782     94  f2f4 e6e5 f4e5 c3e5 g3g4 a7a6 g2c6
  7(13)&      2    231448     97  f2f4 e6e5 g2d5 g8h8 f4e5 c3e5 g1f2 b8f8 f2g2
f8g8
  7(14).      3    360052     97  f2f4 e6e5 g2d5 g8h8 f4e5 c3e5 g1f2 b8f8 f2g2
f8g8
  8(14)&      4    499100     92  f2f4 c3a5 g2e4 a5b6 e3b6 a7b6 e4c6 b7c6 g1g2
  8(17).     10   1210294     92  f2f4 c3a5 g2e4 a5b6 e3b6 a7b6 e4c6 b7c6 g1g2
  9(16)&     12   1444167     79  f2f4 c3a5 g2e4 a5b6 e3b6 a7b6 a2a3 e6e5 g1f2
e5f4
  9(18)&     16   1919562     94  g2e4 e6e5 e3c1 c3d4 c1a3 c6a5 a3d6 b8c8 e4b7
  9(19).     37   4415915     94  g2e4 e6e5 e3c1 c3d4 c1a3 c6a5 a3d6 b8c8 e4b7
 10(19)&     53   6461315     86  g2e4 c3a5 e4c6 b7c6 d7a7 a5b6 e3b6 b8b6 a2a4
b6b2 a7e7 g8h7
 10(20)&     69   8307643     92  f2f4 c3a5 g1f2 a5b6 e3b6 a7b6 a2a3 g7g5 f4g5
h6g5
 10(20).    101  12220814     92  f2f4 c3a5 g1f2 a5b6 e3b6 a7b6 a2a3 g7g5 f4g5
h6g5
 11(20)&    119  14397494     80  f2f4 c3a5 h3h4 a5b6 e3b6 a7b6 a2a3 e6e5 g2d5
g8h8 f4e5 c6e5 d7e7 e5c6
 11(21)&    151  18466155     94  g2e4 c3a5 g1g2 a5b6 e3f4 e6e5 f4c1 b8f8 f2f3
f8f7 d7f7
 11(22).    238  29182671     94  g2e4 c3a5 g1g2 a5b6 e3f4 e6e5 f4c1 b8f8 f2f3
f8f7 d7f7
 12(22)&    282  34767957     88  g2e4 c3a5 g1g2 a5b6 e3b6 a7b6 a2a3 c6e5 d7c7
b8d8 c7b7 d8d4 b7b6
 12(23)&    592  71069265     95  a2a4 e6e5 e3c1 c6a5 g2d5 g8h8 f2f3 a7a6 g1f1
b7b5 d7c7 c3b4
 12(23).    724  87147384     95  a2a4 e6e5 e3c1 c6a5 g2d5 g8h8 f2f3 a7a6 g1f1
b7b5 d7c7 c3b4
 13(24)&   1169 140826181     94  a2a4 e6e5 g2d5 g8h8 e3c1 c6a5 f2f3 a7a6 g1g2
b7b5 a4b5 a6b5 d5e4 b5b4 c1h6
 13(24)&   2233 263419155     95  g1f1 c3a5 g2c6 b7c6 d7a7 a5b6 e3b6 b8b6 f1e2
 13(24).   2407 284768257     95  g1f1 c3a5 g2c6 b7c6 d7a7 a5b6 e3b6 b8b6 f1e2
 14(25)&   3041 361382570     91  g1f1 c3a5 g2c6 b7c6 d7a7 a5b6 e3b6 b8b6 f1e2
c6c5 a2a4 b6b2 e2e3 b2b3 e3f4
 14(26)&   4354 523444212     92  a2a4 a7a6 g2e4 e6e5 e4d5 g8h8 g1f1 c3d4 e3d2
d4b6 d5c6 b7c6




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