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

Author: Kim Roper Jensen

Date: 19:59:01 12/15/01

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

[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
analysis from the position:
Junior 7 - ,.
2r1nbk1/5ppp/8/pp2BN2/2p5/P5P1/1P2PP1P/3R1K2 w - - 0 1

Analysis by Junior 7:

1.Rd7 Bc5
  ²  (0.70)   Depth: 3   00:00:00
1.Rd7 Bc5
  ²  (0.70)   Depth: 3   00:00:00
1.Rd7 Bc5
  ²  (0.70)   Depth: 3   00:00:00
1.Rd7 Bc5
  ²  (0.70)   Depth: 3   00:00:00
1.Rd7 Rc5 2.Ne7+ Bxe7 3.Rxe7 Kf8
  ²  (0.51)   Depth: 6   00:00:00  5kN
1.Rd7 Rc5 2.f4 f6 3.Ne7+ Bxe7 4.Rxe7 Kf8 5.Bd4 Rd5 6.Re4
  =  (-0.11)   Depth: 9   00:00:00  80kN
1.Bc3 b4
  =  (-0.05)   Depth: 9   00:00:00  111kN
1.g4 f6 2.Bc3 g6 3.Nd4 b4 4.Bd2 Nc7 5.a4
  ²  (0.30)   Depth: 9   00:00:00  232kN
1.e4 g6 2.Nd4 b4 3.Ke2 f6 4.Bf4 c3 5.bxc3
  ²  (0.32)   Depth: 9   00:00:00  270kN
1.e4 f6 2.Bd4 b4 3.axb4 axb4 4.Ke2 c3 5.bxc3 bxc3
  ²  (0.28)   Depth: 12   00:00:01  659kN
1.e4 b4 2.axb4 axb4 3.Rc1 f6 4.Bf4 c3 5.bxc3 bxc3 6.g4 c2
  =  (0.01)   Depth: 15   00:00:12  9413kN
1.f4 g6 2.Ne3 Bg7 3.Nd5 Bxe5 4.fxe5 Kg7 5.Kf2 Rd8 6.Ke1 h5
  =  (0.14)   Depth: 15   00:00:16  12111kN
1.f4 b4 2.axb4 axb4 3.Rc1 f6 4.Bd4 c3 5.bxc3 Nd6 6.Nxd6 Bxd6 7.h3 b3
  =  (0.03)   Depth: 17   00:01:06  44964kN
1.e4 b4 2.axb4 axb4 3.Rc1 g6 4.Ne3 c3 5.bxc3 Nd6 6.Nd5 b3 7.Nf6+ Kg7
  =  (0.04)   Depth: 17   00:01:24  56858kN
1.Ne3 f6 2.Bd4 Rd8 3.f3 Kf7 4.Kf2 Ke6 5.a4 Nc7 6.axb5 Nxb5
  =  (0.05)   Depth: 17   00:02:35  95502kN
1.Ne3 f6 2.Bd4 Kf7 3.Nd5 Nd6 4.Bc3 Ra8 5.e4 Nxe4 6.Nc7 Rb8 7.Rd7+ Be7 8.Bxa5
  =  (0.11)   Depth: 18   00:04:57  171496kN
1.Ne3 f6 2.Bd4 b4 3.a4 Nd6 4.f3 c3
  =  (0.05)   Depth: 20   00:10:38  337068kN

(, . 16.12.2001)

Re: A very hard middlegame/endgame position for computers, who gets it ?? Martin Giepmans 08:10:22 12/16/01
Re: A very hard middlegame/endgame position for computers, who gets it ? Gian-Carlo Pascutto 01:55:02 12/16/01
- Re: Not according to Speelman, First Bc3 Then Bxg7 se post for vars Kim Roper Jensen 05:56:33 12/16/01
Re: A very hard middlegame/endgame position for computers, who gets it ?? Uri Blass 22:50:58 12/15/01
- 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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