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Subject: Re: little test position

Author: Dieter Buerssner

Date: 13:29:55 10/17/03

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On October 17, 2003 at 10:30:33, Will Singleton wrote:

>This is from a blitz game Ktulu-Amateur, in which Amateur didn't find the key
>move (takes a few minutes).
>
>7k/8/2R1pn2/1p1r2p1/p6p/P4P2/1P3BPP/7K b - - bm Rd1+

Do you think, it is a force win? My engine finds the move - first with draw
score, then with slightly positive score. But even a long search 2 plies deeper
in the line does not show a convincing score. After Rd1 Bg1 on P4 2.53 GHz:

  57301164  1:13.2   0.07 15t  2...Nh5 3.Rxe6 Nf4 4.Re5 Kh7 5.g3 hxg3 6.hxg3H
                               Nh3H 7.Kg2H Nxg1H 8.Rxg5H Ne2H {180}
  75226677  1:36.1   0.07 15.  2...Nh5 3.Rxe6 Nf4 4.Re5 Kh7 5.g3 hxg3 6.hxg3
                               Nh3 7.Kg2 Nxg1 8.Rxg5 Ne2 {180}
  97314251  2:04.0   0.17 16t  2...Nh5 3.Rxe6 Nf4 4.Re5 Kg7 5.Rxg5+ Kf6 6.Rxb5
                               Ne2 7.Rb6+ Ke7 8.h3 Nxg1 9.Kh2 Ne2H 10.Ra6H
                               Ng3H 11.b4H {HT} {100}
 127216813  2:43.3   0.17 16.  2...Nh5 3.Rxe6 Nf4 4.Re5 Kg7 5.Rxg5+ Kf6 6.Rxb5
                               Ne2 7.Rb6+ Ke7 8.h3 Nxg1 9.Kh2 Ne2 10.Ra6 Ng3
                               11.b4 {HT} {100}
 205582506  4:23.1   0.18 17t  2...Nh5 3.h3 Nf4 4.Rc2 Kg7 5.Kh2 Kf6 6.Be3 Rd3
                               7.Bc5 Kf5 8.Bb4 Rd5 9.Rc6 Nd3 10.Bc3 e5 {-10}
 294698971  6:16.6   0.18 17.  2...Nh5 3.h3 Nf4 4.Rc2 Kg7 5.Kh2 Kf6 6.Be3 Rd3
                               7.Bc5 Kf5 8.Bb4 Rd5 9.Rc6 Nd3 10.Bc3 e5 {-10}
 438664310  9:24.9   0.18 18t  2...Nh5 3.h3 Nf4 4.Rc2 Kg7 5.Kh2 Kf6 6.Be3 Rd3
                               7.Bd2 Kf5 8.Bb4 Rd5H 9.Rc6H Nd3H {HT} {-10}
 754155924 16:30.2   0.18 18.  2...Nh5 3.h3 Nf4 4.Rc2 Kg7 5.Kh2 Kf6 6.Be3 Rd3
                               7.Bd2 Kf5 8.Bb4 Rd5 9.Rc6 Nd3 {HT} {-10}
1015748661 22:11.1   0.23 19t  2...Nh5 3.h3 Nf4 4.Rc2 Kg7 5.Kh2 Kf6 6.Be3 Re1
                               7.Bg1 e5 8.Bf2 Rd1 9.Be3 Rd3 10.Bc5 Ne6 11.Bb4
                               Nd4 {HT} {-10}
1436207548 31:19.3   0.23 19.  2...Nh5 3.h3 Nf4 4.Rc2 Kg7 5.Kh2 Kf6 6.Be3 Re1
                               7.Bg1 e5 8.Bf2 Rd1 9.Be3 Rd3 10.Bc5 Ne6 11.Bb4
                               Nd4 {HT} {-10}
1999567947 43:33.5   0.24 20t  2...Nh5 3.h3 Nf4 4.Rc2 Kg7 5.Kh2 Kf6 6.Be3 Re1
                               7.Bg1 e5 8.Bf2 Rd1 9.Be3 Rd3 10.Rc6+H Kf5H
                               11.Bc5H {HT} {-10}

Regards,
Dieter



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