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Subject: Re: couple positions

Author: Richard Pijl

Date: 01:09:19 09/13/05

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On September 13, 2005 at 01:16:48, Will Singleton wrote:

>[d]5r2/2q3k1/3p1pp1/3Pp1p1/Q1N1P3/2pB1P1P/5PK1/8 b - - bm Rh8; "anything else
>loses";
>
>after 48...Rh8, Kg3 leads to nothing, due to Qc8 etc... but, 49.Qb5 continues
>the pressure, with perhaps Rb8 or Qc8 keeping things interesting.  Lots of sharp
>continuations.

The Baron 1.7.0 initially selects Rh8, finds a problem with it and changes to
Qc5. Switches back to Rh8 as it discovers that Qc5 isn't good either:

 ply       time        nodes   score  pv
  7(13)&   0:00.52    149905   -0.04  Rf8-h8 Qa4-b4 Qc7-c8 Kg2-f1 Rh8xh3
                                      Kf1-e2 c3-c2 (Bd3xc2)
  7(13).   0:00.72    212770   -0.04  Rf8-h8 Qa4-b4 Qc7-c8 Kg2-f1 Rh8xh3
                                      Kf1-e2 c3-c2 (Bd3xc2)
  8(14)&   0:01.30    391565   -0.04  Rf8-h8 Qa4-c2 Qc7-d7 Kg2-f1 Rh8xh3
                                      Qc2xc3 Rh3xf3 (Nc4-e3)
  8(14).   0:01.66    494998   -0.04  Rf8-h8 Qa4-c2 Qc7-d7 Kg2-f1 Rh8xh3
                                      Qc2xc3 Rh3xf3 (Nc4-e3)
  9(16)-   0:09.08   2700393   -0.39  Rf8-h8 (Bd3-f1)
  9(16)&   0:09.95   2986176   -0.85  Rf8-h8 Bd3-f1 Kg7-f8 Qa4-c2 Qc7-c8
                                      Kg2-g1 Qc8-c5 Qc2xc3 (Rh8-h4)
  9(16)&   0:11.39   3436929   -0.63  Qc7-c5 Qa4-b3 f6-f5 Qb3xc3 f5xe4
                                      Bd3xe4 Rf8-c8 Be4-d3
  9(16).   0:13.38   4028810   -0.63  Qc7-c5 Qa4-b3 f6-f5 Qb3xc3 f5xe4
                                      Bd3xe4 Rf8-c8 Be4-d3
 10(16)&   0:17.41   5257867   -0.60  Qc7-c5 Qa4-b3 f6-f5 e4xf5 g6xf5
                                      Qb3xc3 Kg7-h6 Qc3-a3 Qc5xa3
 10(16).   0:22.13   6701189   -0.60  Qc7-c5 Qa4-b3 f6-f5 e4xf5 g6xf5
                                      Qb3xc3 Kg7-h6 Qc3-a3 Qc5xa3
 11(18)&   0:27.47   8427189   -0.91  Qc7-c5 Qa4-b3 f6-f5 e4xf5 g6xf5
                                      Qb3xc3 g5-g4 h3xg4 f5xg4 Bd3-e2 Qc5xd5
                                      (Kg2-g1)
 11(18).   0:39.77  12318962   -0.91  Qc7-c5 Qa4-b3 f6-f5 e4xf5 g6xf5
                                      Qb3xc3 g5-g4 h3xg4 f5xg4 Bd3-e2 Qc5xd5
 12(21)&   0:50.25  15553142   -0.90  Qc7-c5 Qa4-b3 f6-f5 e4xf5 g6xf5
                                      Qb3xc3 f5-f4 Qc3-c2 Qc5xd5 Bd3-e4 Qd5-e6
                                      Qc2-e2 (Rf8-f6)
 12(21).   1:08.84  21295294   -0.90  Qc7-c5 Qa4-b3 f6-f5 e4xf5 g6xf5
                                      Qb3xc3 f5-f4 Qc3-c2 Qc5xd5 Bd3-e4 Qd5-e6
                                      Qc2-e2 (Rf8-f6)
 13(23)&   1:47.03  32733039   -1.00  Qc7-c5 Qa4-b3 f6-f5 e4xf5 g6xf5
                                      Nc4-e3 Qc5-c8 Qb3-b4 Rf8-f6 h3-h4 e5-e4
                                      f3xe4 g5xh4 (Ne3xf5)
 13(23)&   3:00.61  54310766   -0.94  Rf8-h8 Bd3-f1 f6-f5 Qa4-c2 Rh8-h4
                                      Qc2xc3 f5xe4 f3xe4 Rh4xe4 f2-f3 (Re4-d4)
                                      (Bf1-d3)
 13(25).   3:18.55  59892295   -0.94  Rf8-h8 Bd3-f1 f6-f5 Qa4-c2 Rh8-h4
                                      Qc2xc3 f5xe4 f3xe4 Rh4xe4 f2-f3
 14(25)&   5:23.75  96058266   -0.68  Rf8-h8 Bd3-f1 Qc7-b7 Nc4xd6 Rh8-a8
                                      Nd6xb7 Ra8xa4 Bf1-d3 Ra4-a2 Nb7-c5 Ra2-b2
                                      Bd3-c4 c3-c2 Nc5-d3
 14(25).   6:49.17 120604097   -0.68  Rf8-h8 Bd3-f1 Qc7-b7 Nc4xd6 Rh8-a8
                                      Nd6xb7 Ra8xa4 Bf1-d3 Ra4-a2 Nb7-c5 Ra2-b2
                                      Bd3-c4 c3-c2 Nc5-d3
 15(28)&   9:54.80 173369918   -0.92  Rf8-h8 Bd3-f1 Qc7-b7 Nc4xd6 Rh8-a8
                                      Nd6xb7 Ra8xa4 Bf1-d3 Ra4-a2 d5-d6 Ra2-d2
                                      Nb7-c5 Kg7-f8 f3-f4 c3-c2
>
>And from later on in the same game...
>
>[d]2q5/6k1/3p1r2/3Pppp1/1Q6/2pBNP1P/5PK1/8 w - - bm h4!

the Baron doesn't consider anything else:
 ply       time        nodes   score  pv
  6(14)+   0:00.48    124053   +1.65  h3-h4 (g5xh4) (Qb4xh4) (Qc8-d7) (Qh4-h3)
                                      (Rf6-g6) (Kg2-f1)
  6(14)&   0:00.58    146486   +1.69  h3-h4 g5xh4 Qb4xh4 Qc8-f8 Kg2-f1
                                      Kg7-g8 Qh4-g3
  6(14).   0:00.64    166870   +1.69  h3-h4 g5xh4 Qb4xh4 Qc8-f8 Kg2-f1
                                      Kg7-g8 Qh4-g3
  7(14)&   0:01.14    302316   +1.36  h3-h4 g5xh4 Qb4xh4 Qc8-d7 Kg2-f1
                                      Kg7-f7 Qh4-h5 Kf7-e7 (Bd3xf5)
  7(14).   0:01.31    360367   +1.36  h3-h4 g5xh4 Qb4xh4 Qc8-d7 Kg2-f1
                                      Kg7-f7 Qh4-h5 Kf7-e7 (Bd3xf5)
  8(15)+   0:02.94    783830   +1.71  h3-h4 (g5xh4) (Qb4xh4) (Qc8-d7) (Kg2-f1)
                                      (Kg7-f7) (Qh4-h5) (Kf7-e7) (Ne3xf5)
(Ke7-d8) (Kf1-e1)
  8(20)&   0:04.64   1254281   +1.90  h3-h4 g5-g4 f3xg4 f5xg4 Qb4-e4
                                      Kg7-f8 Ne3-f5 Kf8-e8 (h4-h5)
  8(20).   0:04.98   1373579   +1.90  h3-h4 g5-g4 f3xg4 f5xg4 Qb4-e4
                                      Kg7-f8 Ne3-f5 Kf8-e8 (h4-h5)
  9(22)&   0:09.03   2466440   +1.90  h3-h4 g5-g4 f3xg4 f5xg4 Qb4-e4
                                      Kg7-f8 Ne3-f5 Kf8-e8 h4-h5 (Qc8-c5)
  9(22).   0:10.31   2894415   +1.90  h3-h4 g5-g4 f3xg4 f5xg4 Qb4-e4
                                      Kg7-f8 Ne3-f5 Kf8-e8 h4-h5 (Qc8-c5)
 10(20)&   0:18.89   5288270   +1.91  h3-h4 g5xh4 Qb4xh4 Qc8-d7 Kg2-f1
                                      Rf6-f7 Qh4-g5 Kg7-f8 Ne3xf5 Kf8-e8
(Bd3-b5)
 10(21).   0:20.98   6008479   +1.91  h3-h4 g5xh4 Qb4xh4 Qc8-d7 Kg2-f1
                                      Rf6-f7 Qh4-g5 Kg7-f8 Ne3xf5 Kf8-e8
(Bd3-b5)
 11(23)&   0:51.06  14630839   +2.19  h3-h4 g5-g4 f3xg4 f5xg4 Qb4-e4
                                      Kg7-f8 Qe4-h7 Qc8-c5 Bd3-g6 Rf6xg6
 11(23).   0:54.95  15946395   +2.19  h3-h4 g5-g4 f3xg4 f5xg4 Qb4-e4
                                      Kg7-f8 Qe4-h7 Qc8-c5 Bd3-g6 Rf6xg6
Richard.



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