Computer Chess Club Archives

Search

Terms
Messages

Subject: Re: How long to find White's winning move?

Author: Peter Rosendahl
Date: 11:33:00 01/03/02
I have a question about this position: is it really clear that b4
is the (only) best move? Motivated by my stupid engine,
which couldn't find b4 but stayed with Rg5, I tried first Rg5 and
after that b4 with Fritz 6 on the same position and got the
scores +4.00 / +4.09 after about 10 minutes (Athlon 900MHz).
Here is the output:


*** AFTER Rg5 ***

Neue Stellung
r4b1k/pp3Ppp/n1p5/2q1B1R1/2r5/7P/PP2Q1P1/5R1K b - - 0 1

Analysis by Fritz 6:

1...Dc5xe5--
  ±  (1.31)   Tiefe: 1/2   00:00:00
1...Dc5xe5-- 2.Tg5xe5
  +-  (3.66)   Tiefe: 1/3   00:00:00
1...Dc5-b4!
  ²  (0.56)   Tiefe: 1/4   00:00:00
1...Dc5-b4!
  -+  (-2.28)   Tiefe: 1/4   00:00:00
1...Dc5-b4 2.De2-h5
  -+  (-2.22)   Tiefe: 2/6   00:00:00
1...Dc5-b4 2.Tg5-g4 Tc4xg4 3.De2xg4
  -+  (-2.22)   Tiefe: 3/10   00:00:00
1...Dc5-b4 2.Le5-c3 Db4-a4 3.De2-e8
  -+  (-2.06)   Tiefe: 4/13   00:00:00  2kN
1...Tc4-c2!
  -+  (-2.09)   Tiefe: 4/14   00:00:00  3kN
1...Tc4-c2--
  -+  (-1.78)   Tiefe: 5/11   00:00:00  6kN
1...Tc4-c2--
  -+  (-1.78)   Tiefe: 5/15   00:00:00  8kN
1...Tc4-c2--
  -+  (-1.47)   Tiefe: 6/18   00:00:00  20kN
1...Tc4-c2-- 2.De2-d3 Tc2-f2 3.Le5xg7+ Lf8xg7 4.Tg5xc5 Tf2xf1+ 5.Dd3xf1 Sa6xc5
  =  (-0.25)   Tiefe: 6/18   00:00:00  30kN
1...Dc5-b4!
  ³  (-0.28)   Tiefe: 6/18   00:00:00  33kN
1...Dc5-b4! 2.Tg5xg7 Lf8xg7 3.Le5xg7+ Kh8xg7 4.De2-e5+
  ³  (-0.66)   Tiefe: 6/18   00:00:00  39kN
1...Dc5-b4--
  ³  (-0.34)   Tiefe: 7/20   00:00:00  66kN
1...Dc5-b4-- 2.Tg5-h5 Tc4-h4 3.Le5xg7+ Lf8xg7 4.Th5xh4 Db4xh4 5.De2-e8+ Lg7-f8
  =  (0.09)   Tiefe: 7/20   00:00:00  81kN
1...Tc4-c2!
  =  (0.06)   Tiefe: 7/20   00:00:00  129kN
1...Tc4-c2! 2.De2-d3 Tc2-f2 3.Le5xg7+ Lf8xg7 4.Tg5xc5 Tf2xf1+ 5.Dd3xf1
  =  (-0.25)   Tiefe: 7/20   00:00:00  143kN
1...Tc4-c2--
  =  (0.06)   Tiefe: 8/24   00:00:00  280kN
1...Tc4-c2-- 2.De2-e1 Sa6-c7 3.Le5xg7+ Lf8xg7 4.Tg5xc5 Tc2xc5 5.g2-g4
  ²  (0.69)   Tiefe: 8/24   00:00:00  317kN
1...Tc4-c1!
  ²  (0.66)   Tiefe: 8/24   00:00:00  460kN
1...Tc4-c1! 2.Le5xg7+ Lf8xg7 3.Tg5xc5 Tc1xf1+ 4.De2xf1 Sa6xc5 5.Df1-f5
  =  (-0.13)   Tiefe: 8/24   00:00:00  475kN
1...Tc4-c1 2.Le5xg7+ Lf8xg7 3.Tg5xc5 Tc1xf1+ 4.De2xf1 Sa6xc5 5.Df1-f5 b7-b6
6.g2-g4
  =  (-0.03)   Tiefe: 9/20   00:00:00  566kN
1...Tc4-c1--
  ²  (0.28)   Tiefe: 10/21   00:00:01  741kN
1...Tc4-c1-- 2.Tg5-h5 Tc1xf1+ 3.De2xf1 Dc5-c2 4.Th5-g5 Dc2-c5
  +-  (2.34)   Tiefe: 10/22   00:00:01  804kN
1...Tc4-c1 2.Tg5-h5 Tc1xf1+ 3.De2xf1 Dc5-c2 4.Th5-g5 Dc2-c5 5.Df1-f6
  +-  (2.34)   Tiefe: 11/24   00:00:02  1586kN
1...Tc4-c1 2.Tg5-h5 Tc1xf1+ 3.De2xf1 Dc5-c2 4.Th5-g5 Dc2-c5 5.Df1-f6
  +-  (2.34)   Tiefe: 12/26   00:00:04  2876kN
1...Tc4-c1 2.Tg5-h5 Tc1xf1+ 3.De2xf1 Dc5-c2 4.Th5-g5 Dc2-c5 5.Df1-f6
  +-  (2.34)   Tiefe: 13/29   00:00:08  6320kN
1...Tc4-c1 2.Tg5-h5 Tc1xf1+ 3.De2xf1 Dc5-c2 4.Th5-g5 Dc2-c5 5.Df1-f6
  +-  (2.34)   Tiefe: 14/29   00:00:19  14274kN
1...Tc4-c1 2.Tg5-h5 Tc1xf1+ 3.De2xf1 Dc5-c2 4.Th5-g5 Dc2-c5 5.Df1-f6
  +-  (2.34)   Tiefe: 15/33   00:00:46  34472kN
1...Tc4-c1--
  +-  (2.66)   Tiefe: 16/35   00:01:53  84004kN
1...Tc4-c1-- 2.Tg5-h5 Tc1xf1+ 3.De2xf1 Dc5-c2 4.Th5-g5 Dc2-c5 5.Df1-b1 Ta8-d8
6.Tg5-h5
  +-  (3.69)   Tiefe: 16/44   00:03:19  154875kN
1...Tc4-c1--
  +-  (4.00)   Tiefe: 17/38   00:07:45  354630kN


*** AFTER b4 ***

Neue Stellung
r4b1k/pp3Ppp/n1p5/2q1B3/1Pr5/6RP/P3Q1P1/5R1K b - b3 0 1

Analysis by Fritz 6:

1...Dc5xe5--
  +-  (3.34)   Tiefe: 1/1   00:00:00
1...Dc5xe5--
  +-  (3.34)   Tiefe: 1/5   00:00:00
1...Sa6xb4!
  ³  (-0.63)   Tiefe: 1/5   00:00:00
1...Sa6xb4!
  -+  (-3.19)   Tiefe: 1/5   00:00:00
1...Sa6xb4 2.Tg3-g5
  -+  (-3.00)   Tiefe: 2/7   00:00:00
1...Sa6xb4--
  -+  (-2.66)   Tiefe: 3/7   00:00:00
1...Sa6xb4-- 2.De2-b2 h7-h6 3.Le5xg7+ Kh8-h7
  -+  (-2.16)   Tiefe: 3/11   00:00:00
1...Sa6xb4--
  -+  (-1.66)   Tiefe: 4/11   00:00:00
1...Sa6xb4--
  -+  (-1.66)   Tiefe: 4/11   00:00:00
1...Sa6xb4 2.De2-b2 h7-h6 3.a2-a3 Sb4-d5 4.Le5xg7+ Kh8-h7 5.Db2xb7
  -+  (-1.53)   Tiefe: 5/16   00:00:00  2kN
1...Sa6xb4 2.De2-b2 h7-h6 3.a2-a3 Sb4-d5 4.Le5xg7+ Kh8-h7 5.Db2xb7
  -+  (-1.53)   Tiefe: 6/17   00:00:00  6kN
1...Sa6xb4--
  µ  (-1.03)   Tiefe: 7/17   00:00:00  8kN
1...Sa6xb4-- 2.De2-b2 h7-h6 3.Le5xg7+ Kh8-h7 4.Db2-f6 Dc5-h5 5.Lg7xf8
  +-  (3.34)   Tiefe: 7/17   00:00:00  15kN
1...Tc4xb4!
  +-  (3.31)   Tiefe: 7/18   00:00:00  25kN
1...Tc4xb4! 2.Tg3-g5
  +-  (3.22)   Tiefe: 7/18   00:00:00  29kN
1...Tc4xb4 2.Tg3-g5
  +-  (3.22)   Tiefe: 8/21   00:00:00  41kN
1...Tc4xb4--
  +-  (3.66)   Tiefe: 9/24   00:00:00  57kN
1...Tc4xb4--
  +-  (3.66)   Tiefe: 9/24   00:00:00  77kN
1...Dc5xb4!
  +-  (3.62)   Tiefe: 9/25   00:00:00  459kN
1...Dc5xb4! 2.Tg3xg7 Lf8xg7 3.Le5xg7+ Kh8xg7 4.De2-e5+ Kg7-f8 5.De5-h8+ Kf8-e7
6.Dh8xa8
  +-  (3.37)   Tiefe: 9/25   00:00:00  537kN
1...Dc5xb4 2.Tg3xg7 Lf8xg7 3.Le5xg7+ Kh8xg7 4.De2-e5+ Kg7-f8 5.De5-h8+ Kf8-e7
6.Dh8xa8
  +-  (3.37)   Tiefe: 10/26   00:00:01  966kN
1...Tc4xb4!
  +-  (3.34)   Tiefe: 10/26   00:00:01  1081kN
1...Tc4xb4! 2.Tf1-e1 Sa6-c7 3.Le5xc7
  +-  (3.31)   Tiefe: 10/26   00:00:01  1117kN
1...Tc4xb4--
  +-  (3.66)   Tiefe: 11/18   00:00:02  1437kN
1...Tc4xb4--
  +-  (3.66)   Tiefe: 11/29   00:00:02  1675kN
1...Tc4xb4 2.Tf1-e1 Sa6-c7 3.Le5xc7 Ta8-c8
  +-  (3.66)   Tiefe: 12/26   00:00:04  3144kN
1...Tc4xb4!
  +-  (3.34)   Tiefe: 13/28   00:00:10  7713kN
1...Tc4xb4--
  +-  (3.66)   Tiefe: 14/28   00:00:17  12931kN
1...Tc4xb4--
  +-  (3.66)   Tiefe: 14/36   00:00:38  28484kN
1...Tc4xb4--
  +-  (3.97)   Tiefe: 15/33   00:02:03  91651kN
1...Tc4xb4-- 2.Tg3-g5 Tb4-d4 3.Le5xg7+ Lf8xg7 4.Tg5xc5 Td4-d8 5.Tc5-e5 Td8-f8
6.Te5-e8
  +-  (4.09)   Tiefe: 15/42   00:09:17  413614kN

--
p.r.
Re: How long to find White's winning move? Roy Eassa 11:45:20 01/03/02
- Re: How long to find White's winning move? Peter Rosendahl 12:20:41 01/03/02
  - Re: How long to find White's winning move? Will Singleton 20:18:00 01/03/02
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.