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Subject: Triple a-pawn and wrong bishop

Author: Kai Skibbe

Date: 22:28:15 03/26/00

Crafty 17.07 has special code for detecting rookpawns and wrong bishop.
But in the following position Crafty evaluates the position with a positive
score.
Why is the score of Crafty positive ?
I have tested the position with the fritzengine of Crafty 17.07 with 32MB
hashtables on a Celeron 500MHz and no tablebases. BTW with only two pawns on
a-file Crafty shows a drawscore.

[D]k7/8/P7/P7/P7/8/1K6/B7 w - - 0 1

Analysis by Crafty 17.07:

...
1.Kb2-c3 Ka8-a7 2.La1-b2 Ka7xa6 3.Lb2-a3 Ka6xa5 4.La3-f8 Ka5xa4
  =  (0.00)   Tiefe: 8/11   00:00:00  13kN
1.Kb2-c3 Ka8-a7 2.La1-b2 Ka7xa6 3.Lb2-a3 Ka6xa5 4.La3-f8 Ka5xa4 5.Lf8-g7
  =  (0.00)   Tiefe: 9/13   00:00:00  32kN
1.Kb2-c3 Ka8-a7 2.La1-b2 Ka7xa6 3.Lb2-a3 Ka6xa5 4.La3-f8 Ka5xa4 5.Lf8-g7 Ka4-a5
  =  (0.00)   Tiefe: 10/14   00:00:00  64kN
1.Kb2-c3 Ka8-a7 2.La1-b2 Ka7xa6 3.Lb2-a3 Ka6xa5 4.La3-f8 Ka5xa4 5.Lf8-g7 Ka4-a5
6.Lg7-h8
  =  (0.00)   Tiefe: 11/15   00:00:00  128kN
1.Kb2-c3 Ka8-a7 2.La1-b2 Ka7xa6 3.Lb2-a3 Ka6xa5 4.La3-f8 Ka5xa4 5.Lf8-g7 Ka4-a5
6.Lg7-h8 Ka5-a6
  =  (0.00)   Tiefe: 12/17   00:00:00  236kN
1.Kb2-c3 Ka8-a7 2.La1-b2 Ka7xa6 3.Lb2-a3 Ka6xa5 4.La3-f8 Ka5xa4 5.Lf8-g7 Ka4-a5
6.Lg7-h8 Ka5-a6 7.Lh8-g7
  =  (0.00)   Tiefe: 13/18   00:00:01  415kN
1.Kb2-b3
  ²  (0.40)   Tiefe: 13/18   00:00:01  544kN
1.Kb2-b3 Ka8-a7 2.La1-d4+ Ka7xa6 3.Kb3-b4 Ka6-b7 4.Kb4-b5 Kb7-a8 5.a5-a6 Ka8-b8
6.a6-a7+ Kb8-b7 7.Ld4-b6 Kb7-a8 8.Kb5-c4 Ka8-b7
  =  (0.00)   Tiefe: 14/19   00:00:01  807kN
1.Kb2-b3 Ka8-a7 2.La1-d4+ Ka7xa6 3.Kb3-b4 Ka6-b7 4.Kb4-b5 Kb7-a8 5.a5-a6 Ka8-b8
6.a6-a7+ Kb8-b7 7.Ld4-b6 Kb7-a8 8.Kb5-c4 Ka8-b7
  ²  (0.40)   Tiefe: 15/21   00:00:02  1065kN
1.Kb2-b3 Ka8-a7 2.La1-d4+ Ka7xa6 3.Kb3-b4 Ka6-b7 4.Kb4-b5 Kb7-a8 5.a5-a6 Ka8-b8
6.a6-a7+ Kb8-b7 7.Ld4-b6 Kb7-a8 8.Kb5-c4 Ka8-b7
  ±  (0.79)   Tiefe: 16/24   00:00:03  1669kN
1.Kb2-b3 Ka8-a7 2.La1-d4+ Ka7xa6 3.Kb3-b4 Ka6-b7 4.Kb4-b5 Kb7-a8 5.a5-a6 Ka8-b8
6.a6-a7+ Kb8-b7 7.Ld4-b6 Kb7-a8 8.Kb5-c4 Ka8-b7
  ±  (1.18)   Tiefe: 17/24   00:00:04  2195kN
1.Kb2-b3 Ka8-a7 2.La1-d4+ Ka7xa6 3.Kb3-b4 Ka6-b7 4.Kb4-b5 Kb7-a8 5.a5-a6 Ka8-b8
6.a6-a7+ Kb8-b7 7.Ld4-b6 Kb7-a8 8.Kb5-c4 Ka8-b7
  +-  (1.57)   Tiefe: 18/25   00:00:05  2868kN
1.Kb2-b3 Ka8-a7 2.La1-d4+ Ka7xa6 3.Kb3-b4 Ka6-b7 4.Kb4-b5 Kb7-a8 5.a5-a6 Ka8-b8
6.a6-a7+ Kb8-b7 7.Ld4-b6 Kb7-a8 8.Kb5-c4 Ka8-b7
  +-  (1.96)   Tiefe: 19/31   00:00:07  3668kN
1.Kb2-b3 Ka8-a7 2.La1-d4+ Ka7xa6 3.Kb3-b4 Ka6-b7 4.a5-a6+ Kb7xa6 5.Ld4-c5 Ka6-b7
6.Kb4-b5 Kb7-a8 7.Kb5-a6 Ka8-b8 8.Lc5-b6 Kb8-a8 9.Lb6-a5 Ka8-b8 10.La5-c7+
Kb8xc7 11.Ka6-a7 Kc7-c8 12.Ka7-b6
  +-  (1.55)   Tiefe: 20/31   00:00:16  8308kN
1.Kb2-b3 Ka8-a7 2.La1-d4+ Ka7xa6 3.Kb3-b4 Ka6-b7 4.a5-a6+ Kb7xa6 5.Ld4-c5 Ka6-b7
6.Kb4-b5 Kb7-a8 7.Kb5-a6 Ka8-b8 8.Lc5-b6 Kb8-a8 9.Lb6-a5 Ka8-b8 10.La5-c7+
Kb8xc7 11.Ka6-a7 Kc7-c8 12.Ka7-b6
  +-  (1.95)   Tiefe: 21/31   00:00:18  9013kN
1.Kb2-b3 Ka8-a7 2.La1-d4+ Ka7xa6 3.Kb3-b4 Ka6-b7 4.a5-a6+ Kb7xa6 5.Ld4-c5 Ka6-b7
6.Kb4-b5 Kb7-a8 7.Kb5-a6 Ka8-b8 8.Lc5-b6 Kb8-a8 9.Lb6-a5 Ka8-b8 10.La5-c7+
Kb8xc7 11.Ka6-a7 Kc7-c8 12.Ka7-b6
  +-  (2.34)   Tiefe: 22/45   00:00:50  22555kN

Re: Triple a-pawn and wrong bishop Ernst A. Heinz 09:17:57 03/28/00
Re: Triple a-pawn and wrong bishop Dann Corbit 12:02:03 03/27/00
- Re: Triple a-pawn and wrong bishop Robert Hyatt 18:17:00 03/27/00
  - Re: Triple a-pawn and wrong bishop Dann Corbit 18:27:31 03/27/00
    - Re: Triple a-pawn and wrong bishop Robert Hyatt 20:08:13 03/27/00
      - Re: Triple a-pawn and wrong bishop blass uri 02:14:56 03/28/00
        
        Re: Triple a-pawn and wrong bishop Robert Hyatt 12:36:29 03/28/00
        
        Re: Triple a-pawn and wrong bishop Kai Skibbe 20:49:23 03/28/00
        
        Re: Triple a-pawn and wrong bishop Robert Hyatt 06:37:55 03/29/00
        
        Re: Triple a-pawn and wrong bishop KarinsDad 07:17:30 03/29/00
        
        Re: Triple a-pawn and wrong bishop Robert Hyatt 19:00:04 03/29/00
        
        Re: Triple a-pawn and wrong bishop blass uri 12:45:11 03/28/00

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