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Subject: Re: A very hard middlegame/endgame position for computers, who gets it ??

Author: Uri Blass

Date: 22:50:58 12/15/01

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On December 15, 2001 at 22:59:01, Kim Roper Jensen wrote:

>Hi
>
>Here is a little middlegame/endgame position that seems very difficult for
>computers, maybe because its a drawing combination but anyway here it goes
>
>The correct move to get is Bc3, with the idea 1.Bc3,b4 2.axb4,axb4 3.Bxg7!!
>and white either gets the rook and plays Nb6,c4 and have an better endgame or
>the perpetual check f7,h6
>
>the position is from J.Speelman-D.Velimirovic Maribor 1980 round 10

I do not agree.
White has also other options to get a draw.
>
>[D] 2r1nbk1/5ppp/8/pp2BN2/2p5/P5P1/1P2PP1P/3R1K2 w - - 0 1
>
>Junior 7(not deep) with tb and 128Megs of hashtable on a dual P3 1Ghz dont get
>in 10Mins

I think that you should try negative contempt if you want white to force a draw.

Here is some analysis of Junior7(slow p200) with contempt=-100

Junior 7 - ,M
2r1nbk1/5ppp/8/pp2BN2/2p5/P5P1/1P2PP1P/3R1K2 w - - 0 1

Analysis by Junior 7:

1.a4 g6 2.Nd4 bxa4
  ²  (0.38)   Depth: 3   00:00:01
1.g4 Nc7
  ²  (0.50)   Depth: 3   00:00:01
1.Bc3 a4
  ²  (0.62)   Depth: 3   00:00:01
1.Rd7 Bc5
  ²  (0.70)   Depth: 3   00:00:01
1.Rd7 Rc5 2.Ne7+ Bxe7 3.Rxe7 Kf8
  ²  (0.51)   Depth: 6   00:00:02  5kN
1.Bxg7 Rc5 2.Bxf8 Rxf5 3.Bh6 Nf6
  ±  (0.72)   Depth: 6   00:00:02  14kN
1.Bxg7 Rc5 2.Bxf8 Rxf5 3.Be7 Nf6 4.Rd8+ Kg7 5.f3
  ²  (0.57)   Depth: 9   00:00:02  52kN
1.Bxg7 Bxg7 2.Ne7+ Kf8 3.Nxc8 Bxb2 4.Rd8 Bxa3 5.Nb6 c3
  ²  (0.39)   Depth: 12   00:00:07  635kN
1.Bxg7 Bxg7 2.Ne7+ Kf8 3.Nxc8 Bxb2 4.Rd8 Bxa3 5.Na7 c3 6.Rc8 b4 7.Nb5 Bb2 8.Ke1
  =  (0.13)   Depth: 15   00:00:54  6341kN
1.e4 b4 2.Bxg7 Bxg7 3.Ne7+ Kf8 4.Nxc8 Bxb2 5.axb4 c3 6.bxa5 c2 7.Re1 c1Q 8.Rxc1
Bxc1
  =  (0.20)   Depth: 15   00:01:32  11324kN
1.e4 b4 2.Bxg7 Bxg7 3.Ne7+ Kf8 4.Nxc8 Bxb2 5.axb4 axb4 6.Rd8 Bf6 7.Rd7 c3
  =  (0.09)   Depth: 17   00:05:26  37703kN
1.Bxg7 Bxg7 2.Ne7+ Kf8 3.Nxc8 Bxb2 4.Rd8 c3 5.Nd6 Ke7 6.Rxe8+ Kxd6 7.Rc8 b4
8.axb4 axb4 9.Ke1 b3 10.Rd8+
  =  (0.17)   Depth: 17   00:06:23  42649kN

Uri

• Re: Same again, according to Speelman Bxg7 at once is dangerous Kim Roper Jensen 05:58:19 12/16/01
  • Re: Same again, according to Speelman Bxg7 at once is dangerous Uri Blass 06:24:39 12/16/01
    • Re: not quite so, Uri Kim Roper Jensen 08:17:34 12/16/01
      • Re: not quite so, Uri Uri Blass 08:28:17 12/16/01
        • Re: Maybe...... Kim Roper Jensen 09:18:05 12/16/01

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