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Subject: Re: Testposition - The Pawnbishop

Author: Dieter Buerssner

Date: 06:37:16 03/06/01

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On March 06, 2001 at 05:28:38, Sune Larsson wrote:

>  8/2b2k1K/1pPp1p2/1P1P1P2/5B2/8/8/8 w - - 0 1
>
>  Meyer 19??
>  Test: White to move and win. Good evals for white, while just moving
>        around the pieces, are not enough. Can your program actually
>        play out this position for a win? The distinct kill further down.

I did not try to play this out. However the score looks rather convincing.
Yace thinks, Bh6 is also winning:

   5819943  42.476   6.96 21t  1.Be3 Bd8 2.Bd4 Bc7 3.Bxf6 Kxf6 4.Kg8 Kxf5
                               5.Kf8 Bd8 6.Ke8 Bf6 7.c7 Ke4 8.Kf7 Bd4 9.Ke6
                               Be3 10.c8=Q Bc5 11.Qc6 Kf4 12.Qc7 {651}
   7826658  55.290   6.97 21t+ 1.Bh6 Bb8 2.Bg7 Bc7
   8984993  1:04.4   7.22 21++ 1.Bh6 Bb8 2.Bg7 Bc7 3.Bxf6 Kxf6 4.Kg8 Kxf5
                               5.Kf7 Bd8 6.Ke8 Bf6 7.c7 Bd4 8.c8=Q+ Kf4 9.Ke7
                               Bc5 10.Qxc5 bxc5 11.b6 Ke5 12.b7 Ke4 13.b8=Q
                               Kxd5 {841}
  19465864  2:04.4   7.15 21t  1.Bh6 Bb8 2.Bg7 Bc7 3.Bxf6 Kxf6 4.Kg8 Kxf5
                               5.Kf7 Bd8 6.Ke8 Bf6 7.c7 Ke4 8.c8=Q Kxd5 9.Kd7
                               Be5 10.Qc6+ Kd4 11.Qxb6+ Kc4 12.Qc6+ Kb4 {651}
  19465873  2:04.7   7.15 21.  1.Bh6 Bb8 2.Bg7 Bc7 3.Bxf6 Kxf6 4.Kg8 Kxf5
                               5.Kf7 Bd8 6.Ke8 Bf6 7.c7 Ke4 8.c8=Q Kxd5 9.Kd7
                               Be5 10.Qc6+ Kd4 11.Qxb6+ Kc4 12.Qc6+ Kb4 {651}
  20484319  2:11.3   7.55 22++ 1.Bh6 Bb8 2.Bg7 Bc7 3.Bxf6 Kxf6 4.Kg8 Kxf5
                               5.Kf7 Bb8 6.Ke8 Ke4 7.Kd7 Kd4 8.Kc8 Kc5 9.Kxb8
                               Kxb5 10.c7 Kc5 11.c8=Q+ Kd4 12.Qd7 Kxd5 13.Qc7
                               b5 {841}

-- Dieter



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