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Subject: Re: Perhaps the ultimate materialism test position:Can programs avoid Nxa8?

Author: bobby palacios

Date: 20:08:08 03/14/03

Go up one level in this thread


On March 14, 2003 at 22:15:27, Dann Corbit wrote:

>On March 14, 2003 at 21:33:25, ALI MIRAFZALI wrote:
>
>>The following astonishing position is taken from the game Atalik vs Gufeld
>>Losangeles 2000:
>>[D]r1b2rk1/1pNnq1b1/1B1p2n1/P2Pp2p/4Pp2/5Pp1/1P2B1PP/R2QNRK1 w
>>Here Atalik played 21.h3 .In fact incorrect would be 21.Nxa8? However the
>>analysis of why is very difficult and Complicated.Here are two sample lines
>>given by Gufeld  A)21.Nxa8 Nxb6 22.Nxb6 Qh4 23.h3 Bxh3 24.gxh3 Qxh3 25.Rf2 gxf2
>>26.Kxf2 Qh2+ 27.Ng2 Nh4 28.Qh1 Qg3+ 29.Kf1 Nxf3 30.Bxf3 Qxf3+ 31.Kg1 Qxe4
>>32.Qh4 Qd4+ 33.Qf2 e4 34.Ra4 Qd1+ 35.Qe1 Qxe1+ 36.Nxe1 f3 37.Nc2 Rf4
>>B) same as A) until 28: 28.Qf1 Rf6 29.Nc8 Bf8 30.Qh1 Qg3+ 31.Kf1 Nxf3 32.Rd1 Rg6
>>All with advantage to Black.
>>please indicate your result.
>
>Score has dropped pretty low, but crafty has not found it by ply 17:
>
>              17    11:59   0.88   1. Nxa8 Nxb6 2. Nxb6 Qh4 3. h3 Bxh3
>                                   4. gxh3 Qxh3 5. Rf2 gxf2+ 6. Kxf2 Qg3+
>                                   7. Kf1 h4 8. Bc4 h3 9. Ke2 Qh2+ 10.
>                                   Kd3 Qxb2 11. Ra2 Qd4+ 12. Ke2 Qc3
>             time=16:39  cpu=99%  mat=1  n=549752604  fh=89%  nps=550k
>             ext-> chk=13023928 cap=2142702 pp=1781739 1rep=1954652 mate=372481
>
>             predicted=0  nodes=549752604  evals=176775996
>             endgame tablebase-> probes done=0  successful=0
>hite(1):

p4 2.47ghz, 256mb hash

Shredder 7 - 1:14

Analysis by Shredder 7:

1.Nxa8 Nxb6 2.axb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Nd3
  +-  (4.39)   Depth: 10/17   00:00:00  182kN
1.Nxa8 Nxb6 2.axb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Ng2 Qh2#
  +-  (3.89)   Depth: 10/17   00:00:01  205kN
1.Nxa8 Nxb6 2.Nxb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Rf2 gxf2+ 6.Kxf2 Qg3+ 7.Kf1 h4
  ±  (0.94)   Depth: 10/23   00:00:01  304kN
1.Bd4 exd4 2.Nxa8 gxh2+ 3.Kxh2 Qh4+ 4.Kg1 Qh2+ 5.Kxh2 Nh4
  ±  (0.95)   Depth: 10/25   00:00:05  1806kN
1.Bd4 exd4 2.Nxa8 gxh2+ 3.Kxh2 Qh4+ 4.Kg1 Qh2+ 5.Kxh2 Nh4
  ±  (1.30)   Depth: 10/25   00:00:05  2024kN
1.Bd4 exd4 2.Nxa8 Qh4 3.h3 Nde5 4.Qb3 Bxh3 5.gxh3 Qxh3 6.Qxb7 Qh2#
  ±  (1.30)   Depth: 10/25   00:00:06  2388kN
1.Bd4 exd4 2.Nxa8 Qh4 3.h3 Nde5 4.Qb3 Bxh3 5.gxh3 Qxh3 6.Nd3 Rxa8 7.Ra3 Nxd3
  ±  (1.05)   Depth: 11/27   00:00:07  2695kN
1.Bd4 exd4 2.Nxa8 Qh4 3.h3 Nde5 4.Qb3 Bxh3 5.gxh3 Qxh3 6.Nd3 Rxa8 7.Nxe5 dxe5
8.Qxb7
  ²  (0.55)   Depth: 11/28   00:00:08  2987kN
1.Bd4 exd4 2.Nxa8 Qh4 3.h3 Nde5 4.Bb5 Bxh3 5.gxh3 Qxh3 6.Qd2 Rxa8 7.Nc2 d3 8.Nd4
  µ  (-0.87)   Depth: 11/36   00:00:12  4458kN
1.Nxa8 Nxb6 2.Nxb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Rf2 gxf2+ 6.Kxf2 Qg3+ 7.Kf1 Kh8
  µ  (-0.86)   Depth: 11/36   00:00:13  4857kN
1.Nxa8 Nxb6 2.Nxb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Rf2 gxf2+ 6.Kxf2 Qg3+ 7.Kf1 Kh8
8.Nd3 Nh4 9.b4 Qxf3+
  ³  (-0.51)   Depth: 11/36   00:00:13  4880kN
1.Nxa8 Nxb6 2.Nxb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Rf2 gxf2+ 6.Kxf2 h4 7.Nd3 Qg3+
8.Kf1 h3 9.Nf2 Qg2+
  ²  (0.53)   Depth: 11/36   00:00:14  5038kN
1.Nxa8 Nxb6 2.Nxb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Rf2 gxf2+ 6.Kxf2 Qg3+ 7.Kf1 h4
8.Bc4 h3 9.Ke2
  ²  (0.36)   Depth: 12/30   00:00:17  6334kN
1.Nxa8 Nxb6 2.Nxb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Rf2 gxf2+ 6.Kxf2 Qg3+ 7.Kf1 h4
8.Nd3 h3 9.Nf2 Qg2+ 10.Ke1 h2 11.Nc4 h1R+ 12.Nxh1 Qxh1+ 13.Bf1
  =  (0.22)   Depth: 13/35   00:00:27  9781kN
1.Nxa8 Nxb6 2.Nxb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Rf2 gxf2+ 6.Kxf2 Qg3+ 7.Kf1 h4
8.Bc4 h3 9.Ke2 Nh4 10.Kd3 Qg1 11.Kc3 Kh8 12.b4 Qe3+
  =  (0.15)   Depth: 14/40   00:00:49  18093kN
1.h3 Nxb6 2.axb6 Rb8 3.Kh1 Nh4 4.Ra7 Bd7 5.Bb5 Rf7 6.Bxd7 Qxd7
  =  (0.16)   Depth: 14/40   00:01:14  27683kN
1.h3 Nxb6 2.axb6 Rb8 3.Ra7 Rf7
  ²  (0.51)   Depth: 14/40   00:02:02  44721kN

Junior 7 even faster (avoids Nxa8 in 1 second and plays h3 in 33 seconds):


Analysis by Junior 7:


1.Nxa8 Nxb6 2.Nxb6 Qh4 3.h3 Bxh3 4.gxh3 Qxh3 5.Rf2 gxf2+ 6.Kxf2 h4 7.Qc2 Qg3+
8.Kf1
  ²  (0.60)   Depth: 12   00:00:00  445kN
1.Bd4 gxh2+ 2.Kxh2 Qh4+ 3.Kg1 exd4 4.Nxa8 d3 5.Nxd3 Bd4+ 6.Nf2 Bxb2 7.Ra4 Nge5
  ±  (0.99)   Depth: 12   00:00:01  712kN
1.Ne6 Nxb6 2.Nxf8 Nxf8 3.axb6 Qh4 4.h3 Rxa1 5.Qxa1 Qd8 6.Qa8 Qxb6+
  ±  (1.02)   Depth: 12   00:00:01  1069kN
1.Ne6 Nxb6 2.axb6 Bxe6 3.dxe6 Rxa1 4.Qxa1 Qxe6 5.Qa7 Qf7 6.Qa3 d5 7.Qb3
  ³  (-0.32)   Depth: 15   00:00:08  8793kN
1.hxg3 Nxb6 2.Nxa8 fxg3 3.f4 Nxa8 4.f5 Nf4 5.Ra3 h4 6.Rc3 Bd7 7.Nf3 Nxe2+
  ³  (-0.26)   Depth: 15   00:00:28  29270kN
1.h3 Nxb6 2.axb6 Rxa1 3.Qxa1 Nh4 4.Nd3 Bd7 5.Qa7 Bc8 6.Qa8
  ²  (0.43)   Depth: 15   00:00:29  29879kN
1.h3 Nxb6 2.axb6 Rxa1 3.Qxa1 Nh4 4.Bb5 Qd8 5.Nd3 Kh7 6.Qa8
  ²  (0.47)   Depth: 17   00:00:33  33574kN
1.h3 Nxb6 2.axb6 Rxa1 3.Qxa1 Bd7 4.Nd3 Bc8 5.Rc1
  ²  (0.61)   Depth: 19   00:01:08  65059kN







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