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Subject: Re: A very hard test position

Author: Ernst Walet

Date: 12:25:23 02/04/02

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On February 04, 2002 at 07:41:13, Uri Blass wrote:

>This position is from the ssdf games(RebelCentury4-Shredder5.32).
>
>[D]8/8/8/3qr2p/4k2P/3p2PK/R7/Q7 w - - 0 79
>The last move of Shredder was Ke3-e4
>
>How much time does your program need to see that white wins material after
>ke3-e4?
>Is ke3-e4 the losing blunder in the game?
>
>The game continued 79.Rf2 Qd7+ 80.Kh2 Rf5 81.Qe1+ Kd4 82.Ra2 Qb5 and Shredder
>had to resign at move 121
>
>
SNIP
>
>Uri

Fritz7 finds the position better for white, the score is slowly growing.

New game
8/8/8/3qr2p/4k2P/3p2PK/R7/Q7 w - - 0 1

Analysis by Fritz 7:

1.Rf2 Rf5 2.Qe1+ Kd4 3.Rd2 Qf3 4.Kh2 Kd5
  ±  (1.13)   Depth: 7/21   00:00:00  177kN
1.Rf2 Rf5 2.Qe1+ Kd4 3.Rb2 Qf3 4.Qb4+ Kd5 5.Qb3+ Kd6 6.Kh2
  ±  (1.03)   Depth: 8/22   00:00:00  323kN
1.Rf2 Rf5 2.Qe1+ Kd4 3.Rb2 Qf3 4.Qb4+ Kd5 5.Qb3+ Kd6 6.Qb8+ Kd7 7.Kh2
  ±  (1.00)   Depth: 9/25   00:00:01  799kN
1.Rf2 Rf5 2.Qe1+ Kd4 3.Rb2 Qf3 4.Qb4+ Kd5 5.Qb5+ Kd4 6.Qb6+ Rc5 7.Qd8+ Rd5
  ±  (0.75)   Depth: 10/26   00:00:03  2185kN
1.Rf2 Rf5 2.Qe1+ Kd4 3.Rb2 Qf3 4.Qb4+ Kd5 5.Qa5+ Ke4 6.Qa4+ Ke5 7.Qe8+ Kd4
  ±  (0.75)   Depth: 11/30   00:00:10  6725kN
1.Rf2 Qe6+ 2.Kh2 Rf5 3.Qe1+ Kd5 4.Qa5+ Ke4 5.Qb4+ Ke5 6.Qc3+ Kd6 7.Rd2 Re5
8.Qd4+
  ±  (0.75)   Depth: 12/32   00:00:36  23770kN, tb=4
1.Rf2 Qe6+ 2.Kh2 Rf5 3.Rb2 Rc5 4.Qb1 Kf5 5.Qxd3+ Kf6 6.Qd4+ Qe5 7.Qd8+ Ke6
8.Rb6+
  ²  (0.69)   Depth: 13/35   00:01:28  57536kN, tb=19
1.Rf2 Qe6+ 2.Kh2 Kd5 3.Qa3 Kc6 4.Qxd3 Rb5 5.Re2 Qd5 6.Qg6+ Kc5 7.g4 hxg4 8.Rc2+
  ±  (0.72)   Depth: 14/36   00:04:48  189887kN, tb=157
1.Rf2 Qe6+ 2.Kh2 Kd5 3.Qa3 Kc6 4.Qxd3 Rb5 5.Re2 Qd5 6.Qg6+ Kc5 7.g4 hxg4 8.Rc2+
  ±  (0.75)   Depth: 15/40   00:11:34  442418kN, tb=941
1.Rf2 Qe6+ 2.Kh2 Kd5 3.Qa3 Kd4 4.Qb4+
  ±  (0.88)   Depth: 16/41   00:28:06  1094901kN, tb=2599
1.Rf2 Qe6+ 2.Kh2 Kd5 3.Qa3 Kc4 4.Rf4+ Re4 5.Qa4+
  ±  (0.94)   Depth: 17/44   01:12:22  2832537kN, tb=8608

(Celeron 1.2GHz, 832MB hash, 3, 4 & 5 piece EGTB's 04.02.2002)


Ernst.



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