Author: leonid
Date: 20:42:47 06/01/01
Go up one level in this thread
On June 01, 2001 at 17:28:50, Heiner Marxen wrote:
>On June 01, 2001 at 16:44:15, leonid wrote:
>
>>Hello!
>>
>>If you would like to solve one mate in the Friday then look into this:
>>
>>[D]Q2r1BBQ/5Q2/1NQ4R/qqn3qr/NQq1n3/bbpQ3Q/k1p1Q2p/1qnRK1Q1 w - -
>>
>>Please indicate your result.
>>
>>Thanks,
>>Leonid.
>
>Black has some dangerous resources, so this should be relatively easy
>for Chest... in 17.4 minutes on a K7/600 with 350MB hash we have a mate in 11:
>
>Qdxc2+ Qxc2 Qxc2+ Bxc2 Nxc3+ Nxc3 Qfxc4+ Qxc4 Bxc4+ Bb3 Bxb3+ N1xb3
>Qxa3+ Qxa3 Qxa3+ Kxa3 Ra1+ Nxa1 Q3xc3+ Ka2 Qb2#
>
>Except for the last depth the effective branching factor of Chest is
>quite fine (i.e. small):
>
>depth seconds
># 1 0.00 0.87 1- 0
># 2 0.00 1.00 1- 0
># 3 0.02 0.93 123- 0
># 4 0.15 1.04 820- 0
># 5 0.58 1.26 3530- 0
># 6 1.92 1.57 11287- 0
># 7 5.64 2.12 31351- 0
># 8 16.06 3.22 87521- 0
># 9 43.20 4.59 237290- 0
># 10 130.78 5.69 733419- 0
># 11 1042.10 4.80 5721756- 74992
>
> 43.20 / 16.06 = 2.689
> 130.78 / 43.20 = 3.027
>1042.10 / 130.78 = 7.968
Probably position influence well branching factor. I am not that sure that I see
what is the your, but mine is the next one:
4 moves - 0.38 sec
3.7 branching factor
5 moves - 1.426 sec
3.2
6 moves - 4.6 sec
3.48
7 moves - 16.09sec
3.96
8 moves - 63 sec
5.15
9 moves - 328 sec
4.99
10 moves - 27 min 24 sec
Celeron 600Mhz. No hash.
I don't know my brute force time for 11 moves. Selective find in 0.6 sec.
After brute force time for 10 moves, 11 moves could take easely few hours to
solve.
Cheers,
Leonid.
>Cheers,
>Heiner
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