Author: Kolss
Date: 05:34:34 07/25/02
Go up one level in this thread
On July 24, 2002 at 17:56:04, Nolan Denson wrote:
>Ok i was trying to read up on extension and ran across this conversation. So
>what I am wondering how much have we improved with todays programs and faster
>computers ... ( This post will be the first time that i see this position) it
>may be a test problem now.
>
>>Posted by Howard Exner on January 09, 1998 at 21:03:51:
>
>[D]r3rk2/ppq2pbQ/2p1b1p1/4p1B1/2P3P1/3P1B2/P3PPK1/1R5R w - - id"Seiriwan -
>>>Sokolov,A" bm Qxg7+;
>
>>I am always interested in the problems that program X finds quickly
>>while program Y struggles. It makes me curious as to what makes them
>>tick. Rebel 8 for example finds WAC 141 rather quickly but has a very
>>hard time finding this above mate in 7. I think it is the quiet move,
>>Bf6 that is the stumbling block for Rebel.
>
>I checked with Rebel9. Rebel9 needs 22:00 and 11 plies.
>
>The "killer" here is not 3.Bf6 but 6.Rh1
>
>The main variation found:
>
>1.Qxg7 Kxg7 2.Rh7+ Kxh7 3.Bf6 g5 4.Be4+ Bf5 5.Bxf5+ Kg8 6.Rh1 and
>mate on the next move.
I do not think this should be a very difficult position for today's programs.
The current Ikarus version needs 22 seconds on a K6/2-475MHz (some older
versions used to find this in under 10 seconds), and I do not think this is
especially fast - in fact I believe this should be solved even faster! I am sure
you will find several commercial and also non-commercial programs which solve
this within few seconds (I have not checked).
9 7 +0.80 1. Rh2 b6 2. Rbh1 Qd6 3. Qh8+
10 17 FailHigh 1. Rh2! b6 2. Rbh1 Qd6 3. Qh8+
10 17 +1.10 1. Rh2 b6 2. Rbh1 Qd6 3. Qh8+
10 22 FailHigh 1. Qxg7+! Kxg7 2. Rh7+ Kxh7 3. Bf6 Bxg4 4. Bxg4
10 23 +M7 1. Qxg7+ Kxg7 2. Rh7+ Kxh7 3. Bf6 Bxg4 4. Bxg4 g5 5. Bf5+
Kg8 6. Rh1 Reb8 7. Rh8#
11 23 +M7 1. Qxg7+ Kxg7 2. Rh7+ Kxh7 3. Bf6 Bxg4 4. Bxg4 g5 5. Bf5+
Kg8 6. Rh1 Reb8 7. Rh8#
12 27 +M7 1. Qxg7+ Kxg7 2. Rh7+ Kxh7 3. Bf6 Bxg4 4. Bxg4 g5 5. Bf5+
Kg8 6. Rh1 Reb8 7. Rh8#
Regards, Munjong.
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