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Subject: Re: evaluation function

Author: Uri Blass

Date: 10:23:47 08/28/02

Go up one level in this thread

On August 28, 2002 at 12:13:11, Vincent Diepeveen wrote:

>On August 28, 2002 at 11:01:52, Jayakumar Ramanathan wrote:
>
>the truth is that all you will find out is a very primitif information
>about it in programs like gnuchess and crafty which are open source.
>
>the real good evaluations are top secret, both from most amateurs as well
>as from commercials.

I believe that most amateur have simpler evaluation than crafty.
I do not think that it is correct to call crafty evaluation primitive.

There are things that crafty knows when part of the commercial programs do not
know and I am talking about evaluation

Here is a simple example

Crafty knows to evaluate unstoppable passed pawns in pawn endgames.
Junior7 does not know it and needs search to find white's advantage.


New position
[D]8/6pp/6p1/6K1/8/8/P7/7k w - - 0 1

Analysis by Junior 7:

1.a2-a4 Kh1-g2
  -+  (-1.67)   Depth: 3   00:00:00
1.a2-a4 Kh1-g2 2.a4-a5 Kg2-g3 3.a5-a6 h7-h6+ 4.Kg5xg6 Kg3-g2 5.a6-a7
  =  (-0.17)   Depth: 9   00:00:00  3kN, tb=4
1.a2-a4 Kh1-g2 2.a4-a5 Kg2-g3 3.a5-a6 h7-h6+ 4.Kg5xg6 Kg3-g2 5.a6-a7
  =  (-0.17)   Depth: 9   00:00:00  3kN, tb=4
1.a2-a4 Kh1-g2 2.a4-a5 Kg2-g3 3.a5-a6 h7-h6+ 4.Kg5xg6 Kg3-g2 5.a6-a7
  =  (-0.17)   Depth: 9   00:00:00  3kN, tb=4
1.a2-a4 Kh1-g2 2.a4-a5 Kg2-g3 3.a5-a6 h7-h6+ 4.Kg5xg6 Kg3-g2 5.a6-a7
  =  (-0.17)   Depth: 9   00:00:00  3kN, tb=4
1.a2-a4 Kh1-g2 2.a4-a5 Kg2-g3 3.a5-a6 h7-h6+ 4.Kg5xg6 Kg3-g2 5.a6-a7
  =  (-0.17)   Depth: 9   00:00:00  3kN, tb=4
1.a2-a4!
  =  (0.13)   Depth: 12   00:00:00  6kN, tb=13
1.a2-a4! Kh1-g2 2.a4-a5 Kg2-g3 3.a5-a6 Kg3-h2 4.a6-a7 h7-h5 5.a7-a8Q
  +-  (3.48)   Depth: 12   00:00:00  10kN, tb=14
 (Blass, Tel-aviv 28.08.2002)


New position
8/6pp/6p1/6K1/8/8/P7/7k w - - 0 1

Analysis by Crafty 18.15:

1.a2-a4
  +-  (3.60)   Depth: 1/2   00:00:00
1.a2-a4 Kh1-g1
  +-  (3.40)   Depth: 2/2   00:00:00
1.a2-a4 Kh1-g1
  +-  (3.80)   Depth: 3/4   00:00:00
1.a2-a4 Kh1-g1 2.a4-a5
  +-  (3.81)   Depth: 3/4   00:00:00
(Blass, Tel-aviv 28.08.2002)

Uri

• Re: evaluation function Robert Hyatt 08:33:29 08/29/02
• Re: evaluation function Gian-Carlo Pascutto 10:40:17 08/28/02
  • Re: evaluation function Uri Blass 10:58:32 08/28/02
    • Re: evaluation function Georg v. Zimmermann 12:17:29 08/28/02
      • Re: evaluation function Uri Blass 12:37:23 08/28/02
        • Re: evaluation function Georg v. Zimmermann 13:35:10 08/28/02
          • Re: evaluation function Uri Blass 14:14:40 08/28/02
    • Re: evaluation function Gian-Carlo Pascutto 11:15:21 08/28/02
  • Re: evaluation function Russell Reagan 10:55:31 08/28/02
    • Re: evaluation function Gian-Carlo Pascutto 11:18:59 08/28/02
    • Re: evaluation function Uri Blass 10:59:30 08/28/02
      • Re: evaluation function Russell Reagan 11:10:47 08/28/02
        • Re: evaluation function Gian-Carlo Pascutto 11:21:17 08/28/02

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