Author: Will Singleton
Date: 15:14:34 09/25/03
Go up one level in this thread
On September 25, 2003 at 17:20:09, Dieter Buerssner wrote:
>On September 25, 2003 at 12:08:17, Will Singleton wrote:
>
>>6k1/8/p3p2p/2Q5/1N2qp2/8/5K2/8 b - - 0 47
>>
>>Black has the option of Qe3+, going into a 3 pawns vs knight game. It appears
>>from analysis that after the queens are off, white cannot stop all the pawns. I
>>don't know whether it's possible to win without trading queens (doesn't look
>>like it), but it appears certain that Qe3+ will win. However, programs are
>>reluctant to play it.
>
>Kurt showed some analysis by Yace, which choses Qe3+ soon. When I force
>47...Qe3+ 48. Qxe3 fxe3+ 49. Kxe3, it goes to draw score pretty soon, however.
>The shown line starts with 49...a5 {as in the game, you posted} 50. Nd3.
>After the game move, 50. Nc6, the score rises for black.
>
> 74971726 2:49.4 1.42 23t 50...a4 51.Kd4 h5 52.Nb4 a3 53.Na2 Kf7 54.Ke5
> Kg6 55.Kf4 e5+ 56.Kg3 Kg5 57.Nc3 h4+ 58.Kh3 Kf5
> 59.Na2 e4 60.Kg2 Kg4 61.Kf2H h3H 62.Nc1H Kf4H
> 63.Nb3H Kf5H 64.Kf1H e3H 65.Ke1H Kg6H 66.Kf1H
> a2H 67.Na1H h2H 68.Kg2H e2H 69.Nb3H h1=Q+H
> 70.Kxh1H a1=Q+H 71.Nxa1H {HT} {-260}
> 74971740 2:49.4 1.42 23. 50...a4 51.Kd4 h5 52.Nb4 a3 53.Na2 Kf7 54.Ke5
> Kg6 55.Kf4 e5+ 56.Kg3 Kg5 57.Nc3 h4+ 58.Kh3 Kf5
> 59.Na2 e4 60.Kg2 Kg4 61.Kf2 h3 62.Nc1 Kf4
> 63.Nb3 Kf5 64.Kf1 e3 65.Ke1 Kg6 66.Kf1 a2
> 67.Na1 h2 68.Kg2 e2 69.Nb3 h1=Q+ 70.Kxh1 a1=Q+
> 71.Nxa1 {HT} {-260}
> 100302557 4:03.4 1.82 24++ 50...a4 51.Kd4 h5 52.Nb4 a3 53.Na2 Kf7 54.Ke5
> Kg6 55.Kf4 e5+ 56.Kg3 Kf5 57.Kh4 e4 58.Nc3 Ke5
> 59.Na2 e3 60.Kg3H h4+H 61.Kf3H h3H 62.Nb4H h2H
> 63.Nd3+H {HT} {-100}
> 118736525 5:21.0 1.90 24t 50...a4 51.Kd4 h5 52.Nb4 a3 53.Na2 Kf7 54.Ke5
> Kg6 55.Kf4 e5+ 56.Kg3 Kf6 57.Nc3 Kf5 58.Na2H
> h4+H 59.Kh3H e4H 60.Nc3H e3H 61.Kg2H Ke5H
> 62.Kh2H e2H 63.Nd1H exd1=QH 64.Kh3H {1161}
> 118736539 5:21.0 1.90 24. 50...a4 51.Kd4 h5 52.Nb4 a3 53.Na2 Kf7 54.Ke5
> Kg6 55.Kf4 e5+ 56.Kg3 Kf6 57.Nc3 Kf5 58.Na2 h4+
> 59.Kh3 e4 60.Nc3 e3 61.Kg2 Ke5 62.Kh2 e2 63.Nd1
> exd1=Q 64.Kh3 {1161}
> 151288654 6:54.9 2.30 25++ 50...a4 51.Kd4 h5 52.Nb4 a3 53.Na2 Kf7 54.Ke5
> Kg6 55.Kf4 e5+ 56.Kg3 Kf5 57.Kh4 e4 58.Nb4 e3
> 59.Kh3 Ke6 60.Nc2 e2 61.Nd4+ Ke5 62.Nf3+ Kd5
> 63.Kg3 a2 64.Nd2 {-100}
> 165010094 7:20.6 3.30 25++ 50...a4 51.Kd4 h5 52.Nb4 a3 53.Na2 Kf7 54.Ke5
> Kg6 55.Kf4 e5+ 56.Kg3 Kf5 57.Nc3 h4+ 58.Kg2 e4
> 59.Kh1 e3 60.Nd1 e2 61.Ne3+ Ke6 62.Nd1 exd1=Q+
> 63.Kh2
>
>After Nd3 instead, a few minutes of search doesn't show anything besides draw
>score.
>
> 82187229 2:26.7 0.00 27. 50...a4 51.Kd4 a3 52.Kc3 e5 53.Nxe5 {EGTB}
> 53...h5 54.Nc6 h4 55.Ne5 h3 56.Ng4 h2 57.Nxh2!
> a2 58.Kb2! a1=Q+ 59.Kxa1! {No mating material}
> {-340}
>
>Can you suggest a line after Nd3?
>
>Regards,
>Dieter
Ack, you are right. There are pitfalls, and I had assumed 51.Nb4. Apologies to
everyone. Trading the queens does seem to force precise play from white,
though.
Will
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