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Subject: Waht is the biggest positional score of your program?(Crafty >37 pawns)

Author: Uri Blass

Date: 03:47:41 09/25/01

I find that Deep Fritz can get positional score of more than 26 pawns and Crafty
can get a positional score of more than 37 pawns.

Here is the proof

Deep Fritz certainly does not see a promotion at depth 1/2 but the score is
34.44 pawns for white

8 pawns for white is the material score and it means that the positional score
is 26.44 pawns

New position
[D]8/8/PPPPPPPP/8/8/4K3/8/4k3 w - - 0 1

Analysis by Deep Fritz:

1.h7!
  +-  (31.63)   Depth: 1/1   00:00:00
1.h7!
  +-  (34.44)   Depth: 1/2   00:00:00
1.h7 Kd1
  +-  (34.63)   Depth: 2/3   00:00:00
1.h7!
  +-  (34.94)   Depth: 3/4   00:00:00
1.h7! Kd1 2.g7
  +-  (35.44)   Depth: 3/4   00:00:00
1.h7--
  +-  (35.06)   Depth: 4/6   00:00:00
1.h7-- Kd1 2.g7
  +-  (34.81)   Depth: 4/6   00:00:00
1.a7!
  +-  (34.94)   Depth: 4/6   00:00:00
1.f7!
  +-  (35.03)   Depth: 4/8   00:00:00
1.f7!
  +-  (35.38)   Depth: 5/8   00:00:00
1.f7!
  +-  (35.72)   Depth: 6/8   00:00:00  1kN
1.f7! Kd1 2.g7 Kc2
  +-  (36.16)   Depth: 6/12   00:00:00  2kN
1.f7--
  +-  (35.81)   Depth: 7/14   00:00:00  10kN
1.f7-- Kd1 2.Kd3 Ke1 3.g7 Kf2 4.h7
  +-  (35.38)   Depth: 7/14   00:00:00  11kN
1.a7!
  +-  (35.41)   Depth: 7/14   00:00:00  11kN
1.a7! Kd1 2.b7 Kc2 3.c7 Kd1 4.d7
  +-  (36.41)   Depth: 7/14   00:00:00  12kN
1.d7!
  +-  (36.59)   Depth: 7/15   00:00:00  23kN
1.d7!
  +-  (37.75)   Depth: 8/16   00:00:00  26kN
1.d7! Kd1 2.d8Q+
  +-  (#6)   Depth: 8/16   00:00:00  69kN

(Blass, Tel-aviv 25.09.2001)

Crafty's positional scores are even higher and you can see  that the positional
score of Crafty is 37.31 based on the analysis at depth 1

I remember a discussion when vincent rejected the idea of futility pruning
because he may have positional scores of +20.
It seems that Diep is no exception and other programs can have even higer
positional scores

New position
8/8/PPPPPPPP/8/8/4K3/8/4k3 w - - 0 1

Analysis by Crafty 18.10:

1.h7 Kf1
  +-  (45.31)   Depth: 1/2   00:00:00
1.h7 Kf1
  +-  (45.71)   Depth: 2/3   00:00:00
1.h7 Kd1 2.h8Q
  +-  (50.58)   Depth: 2/3   00:00:00
1.h7 Kd1 2.a7 Kc2 3.a8Q
  +-  (50.91)   Depth: 3/5   00:00:00
1.h7 Kd1 2.c7 Ke1 3.h8Q Kd1
  +-  (51.09)   Depth: 4/8   00:00:00
1.h7 Kd1 2.c7 Ke1 3.h8Q Kd1
  +-  (51.49)   Depth: 5/9   00:00:00
1.h7 Kd1 2.h8Q Kc2 3.a7 Kc3 4.a8Q
  +-  (53.86)   Depth: 5/9   00:00:00
1.a7
  +-  (54.26)   Depth: 5/9   00:00:00
1.a7 Kf1 2.a8Q Kg2 3.h7 Kg3 4.h8Q
  +-  (54.31)   Depth: 5/9   00:00:00
1.a7 Kf1 2.a8Q Kg2 3.h7 Kg3 4.h8Q
  +-  (54.71)   Depth: 6/11   00:00:00  63kN
1.a7 Kf1 2.a8Q Kg2 3.c7+ Kg1 4.h7 Kh2 5.h8Q+ Kg3
  +-  (54.80)   Depth: 6/11   00:00:00  91kN
1.a7 Kf1 2.a8Q Kg2 3.c7+ Kg1 4.h7 Kh2 5.h8Q+ Kg3
  +-  (55.20)   Depth: 7/14   00:00:01  240kN
1.a7 Kd1 2.c7 Kc2 3.c8Q+ Kb1 4.b7 Ka2 5.a8Q+ Kb1 6.b8Q#
  +-  (#6)   Depth: 7/14   00:00:02  680kN
1.d7 Kd1 2.b7 Kc1 3.d8Q Kb1 4.b8Q+ Ka1 5.Qa5#
  +-  (#5)   Depth: 7/14   00:00:03  1322kN
1.d7 Kd1 2.b7 Kc1 3.d8Q Kb1 4.b8Q+ Ka1 5.Qa5#
  +-  (#5)   Depth: 8/18   00:00:10  3830kN

(Blass, Tel-aviv 25.09.2001)

Uri

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