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Subject: Re: Tough position for solvers

Author: Ralf Schäfer

Date: 11:20:19 03/15/04

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On March 14, 2004 at 20:28:15, Bas Hamstra wrote:

>This copy & paste from Shredder 5 is soooo cool. This is a tough position from
>BS2830. I am curious how other engines do here. Tao 5.4 used to solve this in 2
>minutes but the latest version has a hard time here.
>
>[D] 2r1r3/p3bk1p/1pnqpppB/3n4/3P2Q1/PB3N2/1P3PPP/3RR1K1 w - -
>
>
>Ciao!
>
>Bas.

Hello Bas,

I'm still surprised that my own engine Cheetah finds this move in 7 seconds at
ply 7 - maybe 7 is its lucky number ;-)

Here is the thinking output:

Cheetah 0.73 WB2 64 MB:
 1   00:00  0,85   Lb3xd5
 1   00:00  2,15   Lb3c2
 2   00:01  0,79   Lb3c2 Te8g8
 3   00:02  0,83   Lb3c2 Te8g8 Te1e2
 4   00:02  0,38   Lb3c2 Le7f8 Lh6d2 Lf8g7
 4   00:02  0,47   Lb3xd5 Dd6xd5 Td1d3 Te8g8
 4   00:02  0,49   Lb3a4 Le7f8 La4xc6 Tc8xc6
 4   00:03  0,53   Dg4h4 Kf7g8 Lb3c2 f6f5
 5   00:03  0,61   Dg4h4 Dd6d7 Lb3xd5 Dd7xd5 Dh4g4
 6   00:04  0,49   Dg4h4 Dd6d7 Td1c1 Kf7g8 Lh6d2 g6g5
 7   00:05  0,61   Dg4h4 Kf7g8 Td1c1 f6f5 Sf3g5 Le7xg5 Lh6xg5
 7   00:07  0,62   Te1xe6 Dd6xe6 Sf3g5+ f6xg5 Dg4f3+ De6f5 Lb3xd5+ Kf7f6 Ld5xc6
Df5xf3
 8   00:09  0,74   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 Sc6e5 d4xe5 Dd6c6
 9   00:11  1,15   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 Dd6d8 Dg4e6+ Kf7g7 Lb3xd5
Sc6a5
10   00:13  2,01   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+
Kf7f8 Te1xe7
10   00:17  2,01   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+
Kf7f8
11   00:21  0,90   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+
Kf7f8 Ld5xc6 Tc8xc6
11   00:52  0,90   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+
Kf7f8
12   00:54  1,16   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+
Kf7f8 Ld5xc6 Tc8xc6
12   02:56  1,16   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+
Kf7f8
13   03:34  1,59   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Dg4h3 Dd6xf4 Dh3xh7+
Kf7f6 Lb3xd5 Sc6d8 b2b4
13   11:50  1,59   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Dg4h3 Dd6xf4 Dh3xh7+
Kf7f6
14   14:31  1,80   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Dg4h3 Dd6xf4 Dh3xh7+
Kf7f6 Lb3xd5 Sc6d8 g2g3
14   54:43  1,80   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Dg4h3 Dd6xf4 Dh3xh7+
Kf7f6
15   01:05:54  1,60   Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 h7h5 Dg4xc8 Te8xc8 Lf4xd6
Le7xd6 Lb3xd5+ Kf7g7

best wishes
Ralf

• Re: Tough position for solvers Dann Corbit 11:28:57 03/15/04
  • Re: Tough position for solvers Ralf Schäfer 13:24:16 03/15/04
    • Re: Tough position for solvers Uri Blass 13:44:59 03/15/04
      • Re: Tough position for solvers Bas Hamstra 02:08:19 03/16/04

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