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Subject: Re: A very tough position for a chess engine to solve.

Author: Enrique Irazoqui

Date: 03:58:17 12/11/00

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On December 10, 2000 at 10:33:49, Laurence Chen wrote:

>[D]1r4qk/4Q1p1/5p1p/4pP2/pP5P/8/1P4P1/3R2K1 w - - 0 36

On a dual P933 with 400MB hash, Deep Fritz picks b5 after 82 seconds and shows
the draw evaluation in 134 seconds. These lousy Fritz 0.00 evals... :)

Enrique


Analysis by Deep Fritz T29c:

1.Qxg7+--
  -+  (-5.84)   Depth: 1/2   00:00:00
1.Qxg7+-- Kxg7
  -+  (-8.75)   Depth: 1/3   00:00:00
1.Qxe5!
  -+  (-8.37)   Depth: 1/3   00:00:00
1.Rd7!
  -+  (-2.87)   Depth: 1/3   00:00:00
1.Rd7!
  ³  (-0.28)   Depth: 1/3   00:00:00
1.h5 Qc8 2.Rd7 Qc1+ 3.Kh2 Qf4+ 4.Kg1
  ³  (-0.47)   Depth: 5/13   00:00:00  6kN
1.h5 Qc8 2.Rd7 Qc1+ 3.Kh2 Qf4+ 4.Kg1
  ³  (-0.47)   Depth: 5/13   00:00:00  6kN
1.h5 Qc8 2.Rd7 Qc1+ 3.Kh2 Qf4+ 4.Kg1
  ³  (-0.47)   Depth: 5/13   00:00:00  6kN
1.h5 Qc8 2.Rd7 Qc1+ 3.Kh2 Qf4+ 4.Kg1
  ³  (-0.47)   Depth: 5/13   00:00:00  6kN
1.h5 Qc8 2.Rd7 Qc1+ 3.Kh2 Qf4+ 4.Kg1
  ³  (-0.47)   Depth: 5/13   00:00:00  6kN
1.h5 Qc8 2.Rd7 Qc1+ 3.Kh2 Qf4+ 4.Kg1
  ³  (-0.47)   Depth: 5/13   00:00:00  6kN
1.h5 Qc8 2.Rd7 Qc1+ 3.Kh2 Rg8 4.Qe6 Qf4+ 5.Kg1
  µ  (-0.75)   Depth: 6/15   00:00:00  17kN
1.Rd6!
  µ  (-0.72)   Depth: 6/16   00:00:00  27kN
1.Rd6! Qc4 2.Rd7 Rg8 3.Ra7 Qd4+ 4.Kf1 Qxh4
  ³  (-0.62)   Depth: 6/16   00:00:00  35kN
1.Qd6!
  ³  (-0.59)   Depth: 6/16   00:00:00  64kN
1.Qd6 Qc8 2.Re1 Qb7 3.Re4 Qxe4 4.Qxb8+ Kh7
  ³  (-0.69)   Depth: 7/17   00:00:00  124kN
1.Qd6 Qc8 2.Ra1 Rb5 3.Rxa4 Qc1+ 4.Kh2 Qf4+ 5.Kg1 Qxf5
  µ  (-0.72)   Depth: 8/20   00:00:00  318kN
1.Qc7!
  ³  (-0.69)   Depth: 8/21   00:00:00  492kN
1.Qc7! Kh7 2.Qe7 Re8 3.Qd7 Qb3
  ³  (-0.59)   Depth: 8/21   00:00:00  561kN
1.Qc7 Kh7 2.Qe7 Qb3 3.Rd7 Qg3 4.h5 Rc8 5.Rd1
  µ  (-0.72)   Depth: 9/17   00:00:00  665kN
1.Qc7 Kh7 2.Qe7 Qb3 3.Rd7 Qg3 4.h5 Rc8 5.Rd1 Rc2
  µ  (-0.81)   Depth: 10/21   00:00:01  1255kN
1.Rd7!
  µ  (-0.78)   Depth: 10/22   00:00:01  1756kN
1.Rd7! Re8 2.Qc5 Qa2 3.Qf2 Qb3 4.Qd2
  µ  (-0.72)   Depth: 10/22   00:00:01  1807kN
1.Rd7 Re8 2.Qc5 Qa2 3.Qc2 a3 4.Rd2 Qa1+ 5.Kh2 Rb8 6.bxa3 Qxa3
  µ  (-0.78)   Depth: 11/24   00:00:02  2512kN
1.Rd7 Re8 2.Qc5 Qa2 3.Qf2 Qb3 4.Qd2
  µ  (-0.81)   Depth: 12/26   00:00:04  4451kN
1.Rd7 Re8 2.Qc5 Qb3 3.Kh2 Qxb2 4.Qc4 Rg8 5.Qg4 Qf2 6.b5 a3
  µ  (-0.81)   Depth: 13/26   00:00:09  11239kN
1.h5!
  µ  (-0.78)   Depth: 13/29   00:00:11  13832kN
1.h5! Rc8 2.Kh2 Re8 3.Qd7 Rb8 4.Rc1 Rd8 5.Qe6 Qf8 6.b5 Qb4
  ³  (-0.41)   Depth: 13/30   00:00:18  21519kN
1.h5 Qc8 2.b5 Kh7 3.Rd7 Qc1+ 4.Kh2 Qf4+ 5.Kg1 Qg5 6.Qf7 Kh8
  ³  (-0.31)   Depth: 14/30   00:00:26  30642kN
1.h5 Re8 2.Qd7 Kh7 3.Ra1 Rc8 4.Qxa4 Rc4 5.Qa3 Qf7 6.Qf3 Rxb4
  ³  (-0.41)   Depth: 15/32   00:00:40  47618kN
1.h5 Re8 2.Qd7 Kh7 3.Ra1 Rc8 4.Qxa4 Rc4 5.Rf1 Qb8 6.Rf2 Rxb4
  ³  (-0.53)   Depth: 16/34   00:01:01  73650kN
1.b5!
  ³  (-0.50)   Depth: 16/35   00:01:22  98313kN
1.b5! Qb3 2.Rd8+ Rxd8 3.Qxd8+ Kh7 4.Qe8 Qe3+ 5.Kh2 Qf4+ 6.Kg1 Qd4+
  =  (0.00)   Depth: 16/35   00:02:14  161373kN

(Irazoqui, Cadaqués 11.12.2000)




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