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Subject: Re: endgame position - null move problem

Author: Richard Pijl

Date: 01:28:31 02/07/03

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On February 06, 2003 at 16:57:29, Jon Dart wrote:

>Here's a position that occurred in a recent offline test game:
>
>[D] 8/6r1/p7/1p6/3kBn1P/P2p1P2/1P6/3R1K2 b - -
>
>Ke3 is winning here, but Arasan 6.3 doesn't get this, in fact it wants to play
>Rg8. It is apparently a null move issue. If I turn off null moves, or restrict
>the null move in the case where the opponent has an advanced passer, then it is
>solved quickly.
>

I can't test here without nullmove, but with (double) nullmove it is fast
anyway. On my P3-500 laptop the Baron 0.99.5a switches to Ke3 after 6 seconds
and is really happy about it in about 14:

 ply       time     nodes  score  pv

  5(11)&      0     12188    -31  g7g8 h4h5 g8h8 e4b7 h8h5
  5(11).      0     14926    -31  g7g8 h4h5 g8h8 e4b7 h8h5
  6(12)&      0     26387    -30  g7g8 b2b4 g8h8 e4b7 h8h4 b7a6
  6(13).      0     34144    -30  g7g8 b2b4 g8h8 e4b7 h8h4 b7a6
  7(14)&      0     80329    -22  g7g8 b2b4 d4e3 h4h5 g8h8 d1e1 e3d2 e4b7
  7(16).      0    100316    -22  g7g8 b2b4 d4e3 h4h5 g8h8 d1e1 e3d2 e4b7
  8(17)&      1    194229    -21  g7g8 b2b4 d4e3 h4h5 d3d2 e4c2 e3f3 a3a4
  8(18).      2    262770    -21  g7g8 b2b4 d4e3 h4h5 d3d2 e4c2 e3f3 a3a4
  9(20)&      5    599961      0  g7g8 b2b3 g8h8 f1f2 h8g8 f2f1 <rep>
  9(22)>      6    759442      1  d4e3
  9(22)+      7    849233     14  d4e3 h4h5 d3d2 h5h6 g7g5 e4b1 f4e2 b1c2
  9(22)&      9   1045761     73  d4e3 b2b4 d3d2 e4f5 f4e2 f5g4 e2c3 h4h5 c3d1
h5h6 g7g8
  9(22).      9   1092843     73  d4e3 b2b4 d3d2 e4f5 f4e2 f5g4 e2c3 h4h5 c3d1
h5h6 g7g8
 10(21)+     14   1704638    108  d4e3 a3a4 d3d2 a4b5 f4h3 b5a6
 10(21)+     18   2100911    198  d4e3 h4h5 d3d2 h5h6 g7g3 e4c2 f4e2 h6h7
 10(21)&     21   2501257    197  d4e3 e4f5 g7g3 f5e4 d3d2
 10(21).     22   2586821    197  d4e3 e4f5 g7g3 f5e4 d3d2
 11(22)+     31   3680559    232  d4e3 e4f5 d3d2 f5e4
 11(24)&     36   4362940    258  d4e3 h4h5 d3d2 h5h6 g7g3 d1d2 e3d2 f1f2 g3g2
f2f1 g2h2 h6h7 f4d3 a3a4 b5a4
 11(24).     38   4688716    258  d4e3 h4h5 d3d2 h5h6 g7g3 d1d2 e3d2 a3a4 b5a4
e4c2
 12(24)+     63   7557040    293  d4e3 h4h5 d3d2 h5h6 g7g3 d1d2 e3d2 e4b7

Richard.



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