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Subject: Re: A difficult position: only Rybka finds the solution...

Author: Richard Pijl

Date: 07:53:48 12/15/05

Go up one level in this thread


On December 15, 2005 at 10:08:38, Ernest Bonnem wrote:

>From the German CSS Forum (Frank v/d Muysenberg, 30 July 2005):
>
>[D]r3r1k1/npq1pp1p/6p1/p1P2bN1/5P2/1P4P1/PQ4BP/2R2RK1 w - - 0 1
>
>at the time no program could find 1.g4!
>... except Shredder 6 Paderborn (5 hours on P4-2.53GHz)
>
>6 months later, I am told Fritz 9, on Athlon64-2.4GHz, also gets it , in over 5
>hours.
>
>But look at Rybka, on my "slow" AMD mobile 1.66GHz, 256MB hash:
>
>VP (Default: Very Positional):
>Rybka Beta 107 min     Rybka Preview 89 min
>SP (Default: Slightly Positional):
>Rybka Beta  47 min     Rybka Preview 47 min
>ST (Default: Slightly Tactical):
>Rybka Beta 125 min
>VT (Default: Very Tactical):
>Rybka Beta  84 min
>

the Baron 1.7.1 beta 4 on a Xeon 2.8 Ghz (single CPU) finds it in just 3
minutes:

 ply       time        nodes   score  pv
  6(12)&   0:01.19    267863   +0.72  Qb2-e5 Qc7xe5 f4xe5 h7-h6 g3-g4
                                      Bf5xg4 (Ng5xf7)
  6(12).   0:01.30    294224   +0.72  Qb2-e5 Qc7xe5 f4xe5 h7-h6 g3-g4
                                      Bf5xg4 (Ng5xf7)
  7(14)&   0:01.45    331504   +0.87  Qb2-e5 Qc7xe5 f4xe5 Na7-c6 g3-g4
                                      Bf5xg4 Bg2xc6
  7(14).   0:02.59    596764   +0.87  Qb2-e5 Qc7xe5 f4xe5 Na7-c6 g3-g4
                                      Bf5xg4 Bg2xc6
  8(13)&   0:03.11    715171   +0.87  Qb2-e5 Qc7xe5 f4xe5 Na7-c6 g3-g4
                                      Bf5xg4 Bg2xc6 b7xc6 (Rf1xf7)
  8(14).   0:04.48   1038641   +0.87  Qb2-e5 Qc7xe5 f4xe5 Na7-c6 g3-g4
                                      Bf5xg4 Bg2xc6 b7xc6 (Rf1xf7)
  9(13)&   0:05.59   1310925   +0.73  Qb2-e5 Qc7xe5 f4xe5 Na7-c6 g3-g4
                                      Bf5xg4 Bg2xc6 b7xc6 Rf1xf7 (h7-h6)
  9(14).   0:14.44   3344746   +0.73  Qb2-e5 Qc7xe5 f4xe5 Na7-c6 g3-g4
                                      Bf5xg4 Bg2xc6 b7xc6 Rf1xf7 (h7-h6)
 10(15)&   0:16.86   3949156   +0.78  Qb2-e5 Qc7xe5 f4xe5 Na7-c6 Bg2-d5
                                      Re8-d8 Bd5xf7 Kg8-h8 Rc1-c4 Nc6xe5 Rc4-h4
                                      (h7-h5)
 10(17).   0:30.31   6858671   +0.78  Qb2-e5 Qc7xe5 f4xe5 Na7-c6 Bg2-d5
                                      Re8-d8 Bd5xf7 Kg8-h8 Rc1-c4 Nc6xe5 Rc4-h4
                                      (h7-h5)
 11(16)&   0:42.41   9766539   +0.60  Qb2-e5 Qc7xe5 f4xe5 Ra8-b8 h2-h3
                                      h7-h6 g3-g4 Bf5-d3 Rf1-f3 Bd3-c4 e5-e6
                                      (h6xg5) (Rc1xc4)
 11(18).   1:42.86  23655923   +0.60  Qb2-e5 Qc7xe5 f4xe5 Ra8-b8 h2-h3
                                      h7-h6 g3-g4 Bf5-d3 Rf1-f3 Bd3-c4 e5-e6
 12(19)&   2:04.89  28996155   +0.74  Qb2-e5 Qc7xe5 f4xe5 Na7-c6 Bg2-d5
                                      e7-e6 Bd5xc6 b7xc6 g3-g4 Bf5xg4 Rf1xf7
                                      h7-h6 (Rf7-f4)
 12(19)&   2:59.40  40295255   +0.76  g3-g4 Bf5-d3 Rf1-f3 Ra8-d8 b3-b4
                                      a5-a4 Qb2-e5 Na7-b5 Qe5xc7 Nb5xc7 Rf3xd3
                                      Rd8xd3 (Bg2xb7)
 12(20).   3:48.01  50882577   +0.76  g3-g4 Bf5-d3 Rf1-f3 Ra8-d8 b3-b4
                                      a5-a4 Qb2-e5 Na7-b5 Qe5xc7 Nb5xc7 Rf3xd3
                                      Rd8xd3 (Bg2xb7)
 13(22)+   6:34.07  83312030   +1.11  g3-g4 (Bf5-d3) (Rf1-f3) (Ra8-d8) (f4-f5)
                                      (g6xf5) (g4xf5)
 13(23)&  10:45.29 131662800   +1.43  g3-g4 Bf5-d3 Rf1-f3 Re8-d8 f4-f5
                                      Qc7-d7 Rf3-h3 Qd7-d4 Qb2xd4 Rd8xd4 f5xg6
                                      h7xg6 Bg2xb7 Rd4xg4 Rh3-g3
 13(23).  11:32.68 142674760   +1.43  g3-g4 Bf5-d3 Rf1-f3 Re8-d8 f4-f5
                                      Qc7-d7 Rf3-h3 Qd7-d4 Qb2xd4 Rd8xd4 f5xg6
                                      h7xg6 Bg2xb7 Rd4xg4 Rh3-g3


Richard.



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