Author: leonid
Date: 12:42:13 07/30/01
Go up one level in this thread
On July 29, 2001 at 22:22:00, Heiner Marxen wrote:
>On July 29, 2001 at 08:27:06, leonid wrote:
>
>>Hi!
>>
>>If this position give you impression as very moderate, it is for reason.
>>Position is very balanced and, probably, solvable by every chess program.
>>
>>[D]bQ1q1R1N/2Q1q1R1/1B1Q1q1r/K1n1Q1q1/1Q1Q1q1k/2Q1q1q1/1r1Q1q1n/b1N1Q1qB w - -
>>
>>Please indicate your result.
>>
>>Thanks,
>>Leonid.
>
>Hello Leonid,
>
>After 2.3 hours (K7/600, 350 MB) Chest finds 3 key moves for a mate in 9:
>
>PV: Qxg5+ Qfxg5 Rxf4+ Ng4 Rxg4+ Kh5 Qxh6+ Qxh6 Qde5+ Q3g5 R7xg5+ Qexg5 Rh4+ Qxh4
>Qf7+ Qg6 Qxg6#
>PV: Qexf4+ Q6xf4 Rxf4+ Ng4 Rxg4+ Kh5 Qxh6+ Qxh6 Qde5+ Q3g5 R7xg5+ Qexg5 Rh4+
>Qxh4 Qf7+ Qg6 Qxg6#
>PV: Qdxf4+ Qg3xf4 Qxg5+ Qfxg5 Qxh6+ Qxh6 Rxf4+ Qg4 Rfxg4+ Kh5 Q3e5+ Q7xe5 Rh4+
>Qdxh4 Qf7+ Qg6 Qxg6#
>
>All white moves in the above PVs are checking moves, so I suspect that your
>selective search already found the mate in 9. A shorter one does not exist.
>
>Most of the time the EBF was around 7.5, and in the last two depths climbed
>to 9.5 and 12.5. Otherwise this one was much like most of your problems
>(as far as Chest is concerned).
>
>Cheers,
>Heiner
Hi, Heiner!
Was very surprised to see that this time your branching factor is very closed to
mine. In previous position my branching was two times worst.
Now I went only first 8 moves by brute force and solved 9 by selective. Probably
it will be funny for you to see my numbers.
Moves Time Branching factor
4 0.77 sec
7.8
5 6.04 sec
7.75
6 46.87 sec
8.73
7 6 min 49 sec
10.06
8 1 hour 6 min
Cheers,
Leonid.
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