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Subject: Re: Rybka bugs comment

Author: Albert Silver

Date: 06:40:57 12/08/05

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On December 08, 2005 at 05:39:08, Vasik Rajlich wrote:

>Hello,
>
>I appreciate the great feedback from the testers. Rybka played over 5,000 games
>in my testing, but under very limited conditions, and many new things have
>popped up after the Beta release. Here is a list of major known problems with
>comments:
>
>10) Endgame knowledge - this is for Rybka 2.0. It should not be hard in
>principle, in fact I expect it to be easier than middlegame knowledge. There
>just wasn't time. I do apologize to the endgame lovers out there :)

Sounds good, and I'll be in the list of first buyers. As to endgame knowledge,
here's where I'd start (from the recently posted match):

[D]8/8/5k2/5P2/8/4K3/8/8 w - - 0 63

Analysis by Rybka 1.0 Beta 32-bit:

63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8
  ±  (1.34)   Depth: 3   00:00:00
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8
  ±  (1.34)   Depth: 9   00:00:00
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8
  ±  (1.34)   Depth: 9   00:00:00
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8
  ±  (1.34)   Depth: 9   00:00:00  8kN
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8
  ±  (1.34)   Depth: 9   00:00:00  8kN
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8
  ±  (1.34)   Depth: 9   00:00:00  8kN
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8 66.Kf4
  +-  (1.51)   Depth: 9   00:00:00  9kN
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8 66.Kf4 Kf7
  +-  (1.70)   Depth: 10   00:00:00  11kN
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8 66.Kf4 Kf7 67.Kf5
  +-  (1.50)   Depth: 11   00:00:00  19kN
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8 66.Kf4 Kf7 67.Kf5 Kf8
  +-  (1.58)   Depth: 12   00:00:00  23kN
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8 66.Kf4 Kf7 67.Kf5 Kf8
  +-  (1.51)   Depth: 13   00:00:00  29kN
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8 66.Kf4 Kf7 67.Kf5 Kf8
  +-  (1.70)   Depth: 14   00:00:01  36kN
63.Ke4 Kf7 64.Ke5 Ke7 65.f6+ Kf8 66.Kf4 Kf7 67.Kf5 Kf8
  +-  (1.41)   Depth: 15   00:00:01  62kN
63.Ke4 Kf7 64.Kf4 Kf6 65.Kg4 Ke7 66.Kf3 Kf7 67.Kg4 Kf6
  +-  (1.51)   Depth: 16   00:00:01  261kN
63.Ke4 Kf7 64.Kf4 Kf6 65.Kg4 Ke7 66.Kf3 Kf7 67.Kg3 Kf6
  +-  (1.41)   Depth: 17   00:00:02  271kN
63.Ke4 Kf7 64.Kf4 Kf6 65.Kg4 Ke7 66.Kf3 Kf7 67.Kg3 Kf6
  +-  (1.41)   Depth: 18   00:00:02  278kN
63.Ke4 Kf7 64.Kf4 Kf6 65.Kg4 Ke7 66.Kf3 Kf7 67.Kg3 Kf6
  +-  (1.41)   Depth: 19   00:00:03  286kN
63.Ke4 Kf7 64.Kf4 Kf6 65.Kg4 Ke7 66.Kf3 Kf7 67.Kg3 Kf6
  +-  (1.41)   Depth: 20   00:00:03  300kN
63.Ke4 Kf7 64.Kf4 Kf6 65.Kg4 Ke7 66.Kf3 Kf7 67.Kg3 Kf6
  +-  (1.51)   Depth: 21   00:00:03  444kN
63.Ke4 Kf7 64.Kf4 Kf6 65.Kg4 Ke7 66.Kf3 Kf7 67.Kg3 Kf6
  +-  (1.58)   Depth: 22   00:00:04  490kN
63.Ke4 Kf7 64.Kf4 Kf6 65.Kg4 Ke7 66.Kf3 Kf7 67.Kg3 Kf6
  ±  (1.40)   Depth: 23   00:00:04  810kN
63.Ke4 Kf7 64.Kf4 Kf6 65.Kg4 Ke7 66.Kf3 Kf7 67.Kg3 Kf6
  +-  (1.58)   Depth: 24   00:00:04  1115kN

(Silver, Private 08.12.2005)

>11) NPS - please don't worry about this number. Rybka uses the same CPU cycles
>as everyone else. Search is a very weird and complicated thing, every engine is
>searching 99.9% nonsense anyway.
>
>Again, I appreciate all of the great feedback and look forward to being ready
>with a stable 1.0 in a few days.
>
>Best regards,
>Vas



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