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Subject: Re: Chess program improvement project (copy at Winboard::Programming)

Author: Will Singleton

Date: 07:39:40 03/07/06

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On March 07, 2006 at 03:33:12, Richard Pijl wrote:

>On March 06, 2006 at 22:53:05, Dann Corbit wrote:
>
>>Lot's of programs have a problem with this one.  It's a sacrifice leading to a
>>forced mate.  I would not worry about this one too much:
>>[D] 4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - bm Qxf4
>
>Single reply extensions, mate threat extensions and checks in quiescense search
>all help in finding this one quickly. Down-side: When used unrestricted,
>searches will explode. I agree here with Dann, don't worry about this one.
>The Baron finds the move in 7.6 seconds on a Xeon 2.8, reporting the mate in 48
>seconds.
>
> ply       time        nodes   score  pv
>  2( 3)-   0:00.00       285   -1.23  Kg2-g1 (Re8-e2)
>  2( 3)&   0:00.00       383   -1.70  Kg2-f1 Kg8-f8
>  2( 3).   0:00.00       414   -1.70  Kg2-f1 Kg8-f8
>  3( 5)&   0:00.00       757   -1.44  Kg2-f1 Kg8-f8 Qc1-d2
>  3( 5).   0:00.00       903   -1.44  Kg2-f1 Kg8-f8 Qc1-d2
>  4( 7)&   0:00.02      2352   -1.58  Kg2-f1 Kg8-f8 Bf6-g5 Nf4-e2
>  4( 7).   0:00.02      2880   -1.58  Kg2-f1 Kg8-f8 Bf6-g5 Nf4-e2
>  5( 9)&   0:00.09     14038   -1.70  Kg2-f1 Re8-e2 Kf1-g1 Re2xf2 Qc1-e1
>  5( 9).   0:00.09     15667   -1.70  Kg2-f1 Re8-e2 Kf1-g1 Re2xf2 Qc1-e1
>  6(12)&   0:00.28     44250   -1.81  Kg2-f1 Re8-e2 Kf1-g1 Re2xf2 Qc1-e3
>                                      Rf2-g2 Kg1-f1 Kg8-h7
>  6(12).   0:00.30     48368   -1.81  Kg2-f1 Re8-e2 Kf1-g1 Re2xf2 Qc1-e3
>                                      Rf2-g2 Kg1-f1 Kg8-h7
>  7(13)&   0:00.97    153287   -1.93  Kg2-f1 Re8-e2 Rh1-h2 Kg8-f8 a2-a4
>                                      b5xa4 Bb3xa4 Nf4-d3
>  7(13).   0:01.45    232925   -1.93  Kg2-f1 Re8-e2 Rh1-h2 Kg8-f8 a2-a4
>                                      b5xa4 Bb3xa4 Nf4-d3
>  8(16)+   0:04.75    784071   -1.58  Kg2-f1 (Re8-e2) (Rh4xf4) (Bd6xf4) (Qc1-b1)
>
>                                      (Rd7-e7) (Qb1xg6) (Kg8-f8) (Bf6xe7)
>(Qc7xe7) (Qg6xf7)
>  8(16)&   0:07.05   1186288   -1.03  Kg2-f1 Rd7-e7 Bf6xe7 Re8xe7 Rh1-g1
>                                      Kg8-f8 Rg1-g5 f7-f6 Rg5-g3
>  8(16)+   0:07.61   1302604   -0.33  Qc1xf4 (Bd6xf4) (Rh4xh5) (g6xh5) (Rh1xh5)
>                                      (Bf4-h6) (Rh5xh6) (Kg8-f8) (Rh6-h8)
>  8(17)&   0:47.89  10652406  MATE6  Qc1xf4 Bd6xf4 Rh4xh5 g6xh5 Rh1xh5
>                                      Bf4-h6 Rh5xh6 Qc7-h2 Kg2xh2 b5-b4 Rh6-h8
>  8(17).   0:48.12  10697945  MATE6  Qc1xf4 Bd6xf4 Rh4xh5 g6xh5 Rh1xh5
>                                      Bf4-h6 Rh5xh6 Qc7-h2 Kg2xh2 b5-b4 Rh6-h8

Based on the performance of several progs, it's possible that this is a position
you should worry about.  Most find the mate in 5 secs or less.

Will

• Re: Chess program improvement project (copy at Winboard::Programming) Uri Blass 11:13:48 03/07/06
  • Re: Chess program improvement project (copy at Winboard::Programming) Robert Hyatt 12:47:26 03/07/06
    • Re: Chess program improvement project (copy at Winboard::Programming) Stuart Cracraft 16:16:31 03/07/06
      • Re: Chess program improvement project (copy at Winboard::Programming) Robert Hyatt 18:49:28 03/07/06
      • Re: Chess program improvement project (copy at Winboard::Programming) Dann Corbit 16:32:24 03/07/06

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