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Subject: Re: interesting evaluation problem

Author: Richard Pijl

Date: 07:52:40 12/14/03

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On December 14, 2003 at 10:07:15, Jon Dart wrote:

>A recent game between Arasan and The Baron on ICC led to this position:
>
[D] 1k3nr1/p2r1p2/1p1PpQ2/2q5/P2R1PP1/5KB1/3R4/8 w - - 0 1
>
>Here, Arasan actually thinks Black is ahead, by over a pawn. The reason
>is that it gives a high king safety penalty to White, since White's
>king is on the third rank, and since the rook on g8 atacks a pawn
>near the king. But in truth, Black does not have an attack.
>
>Black does not get a high king safety penalty because his king is
>behind the pawns on the 1st rank, and because no White pieces are
>near enough to trigger a "proximity" score.
>
>Also Arasan does not give White a high score for the pawn on d6, because
>it is blocked by the Black rook. But the pawn is dangerous.
>
>Crafty gives about a 1/2 pawn advantage to White here, which seems much
>more reasonable (Black lost this game). There is no quick win here, but
>Black is in trouble.

The Baron liked its own position here. It immediately values the position with
over half a pawn for white. Elements valued by the Baron:
- passer on the 6th rank without minor pieces to block it
- Intact pawn shield in front of the white king
- Space advantage for white

 ply       time        nodes   score  pv

  4( 8).   0:00.11     12634   +0.52  Rd4-e4 Qc5-a3 Re4-e3 Qa3xa4 Qf6-c3
  5( 9)>   0:00.16     24203   +0.19  Qf6-h6
  5( 9)&   0:00.16     26556   +0.50  Qf6-h6 f7-f5 g4-g5 Qc5-c6 Kf3-f2 Nf8-g6
  5( 9)>   0:00.22     29225   +0.51  Qf6-e5
  5( 9)&   0:00.22     34190   +0.64  Qf6-e5 Qc5-c3 Rd2-d3 Qc3-c2 Qe5-b5 f7-f6
  5(10).   0:00.33     53277   +0.64  Qf6-e5 Qc5-c3 Rd2-d3 Qc3-c2 Qe5-b5 f7-f6
  6(11)&   0:00.44     76270   +0.76  Qf6-e5 Qc5-c3 Rd2-d3 Qc3-c2 Qe5-b5 f7-f5
                                      g4-g5
  6(13).   0:00.55     92510   +0.76  Qf6-e5 Qc5-c3 Rd2-d3 Qc3-c2 Qe5-b5 f7-f5
                                      g4-g5
  7(15)&   0:01.04    172139   +0.79  Qf6-e5 Qc5-c6 Qe5-e4 Qc6-c3 Rd2-d3 Qc3-c5
                                      Qe4-e1 Nf8-h7 Qe1-c3
  7(17).   0:01.26    224697   +0.79  Qf6-e5 Qc5-c6 Qe5-e4 Qc6-c3 Rd2-d3 Qc3-c5
                                      Qe4-e1 Nf8-h7 Qe1-c3
  8(18)&   0:03.18    609492   +0.79  Qf6-e5 Qc5-c6 Qe5-e4 Qc6-c1 Qe4-e1 Kb8-b7
  8(22).   0:03.95    792589   +0.79  Qf6-e5 Qc5-c6 Qe5-e4 Qc6-c1 Qe4-e1 Kb8-b7
  9(22)&   0:09.45   2044084   +0.73  Qf6-e5 Qc5-c6 Qe5-e4 Qc6-c1 Rd2-d1 Qc1-c3
                                      Rd1-d3 Rg8-g5 Rd3xc3 Rg5xg4
  9(22).   0:12.96   2846018   +0.73  Qf6-e5 Qc5-c6 Qe5-e4 Qc6-c1 Rd2-d1 Qc1-c3
                                      Rd1-d3 Rg8-g5 Rd3xc3 Rg5xg4
 10(26)&   0:28.23   6382608   +0.73  Qf6-e5 Qc5-c6 Qe5-e4 Qc6-c3 Rd2-d3 Qc3-c1
                                      Rd3-d1 Qc1-c3 Rd1-d3 <rep>
 10(26).   0:37.62   8582334   +0.73  Qf6-e5 Qc5-c6 Qe5-e4 Qc6-c3 Rd2-d3 Qc3-c1
                                      Rd3-d1 Qc1-c3 Rd1-d3 <rep>

Richard.



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