Author: leonid
Date: 14:18:51 02/26/02
Go up one level in this thread
On February 26, 2002 at 08:04:56, Heiner Marxen wrote:
>On February 25, 2002 at 12:43:33, leonid wrote:
>
>>On February 25, 2002 at 10:47:42, Heiner Marxen wrote:
>>
>>>On February 23, 2002 at 19:29:04, leonid wrote:
>>>
>>>>[D]5B2/pRNRQN2/p2qqrkr/K2p3p/P2q3n/P2bbnnq/PPQPNN2/5B2 w - -
>>>>
>>>>Please indicate your result.
>>>>
>>>>Thanks,
>>>>Leonid.
>>>
>>>Chest confirms that there is no mate-in-10. Hence, the already found
>>>solutions in 11 moves are shortest possible. I'll followup, if depth==11
>>>is completed...
>>
>>Thanks, Heiner!
>>
>>Your help is all the time valuable. This positions look like very easy and with
>>more, or less normal branching factor up to depth 10. At 10 it jump
>>dramatically. At least, it is true for my program. If mine looked 9 moves only
>>in 23 min. and had previous branching 6.65, it not responded for 10 moves even
>>after 8 hours. This signify that branching factor jumped more that two times.
>>
>>Cheers,
>>Leonid.
>
>Hi Leonid,
>
>Chest finds a unique key move for depth 11 (Athlon 1500+, 2.7 hours, 128MB hash)
>
>PV: Nh8+ Kf5 Bxh3+ Qg4 Qxd3+ Ne4 Nxe6 Bxd2+ b4 Bxb4+ Rxb4 Rxe6 Qf7+ Ref6 Rxd6
>Ng2 Rxd5+ Ne5 Rxe5+ Kxe5 Qfd5#
>
>Here is my timing info:
># 4 0.03s 3kN [ 5.34] 1.04 459- 0
># 5 0.17s [ 5.67] 13kN [ 4.27] 1.20 2522- 0
># 6 0.70s [ 4.12] 53kN [ 3.95] 1.64 11254- 0
># 7 2.63s [ 3.76] 216kN [ 4.10] 2.22 45584- 0
># 8 13.78s [ 5.24] 1468kN [ 6.79] 2.56 249668- 0
># 9 107.31s [ 7.79] 15276kN [ 10.41] 2.59 1704722- 6749
># 10 1318.46s [ 12.29] 187860kN [ 12.30] 2.64 20453322- 17254089
># 11 9864.46s [ 7.48] 1420383kN [ 7.56] 2.70 151896018- 148696785
>
>So, it does jump with its EBF, but not as dramatically as for you.
>In the rest of my statistics I also do not see anything unusual or dramatic.
>Dunno, what kind of effect you are experiencing, sorry.
Hi, Heiner,
I don't know exactly how much my strange jumping in branching factor was really
for this position, since I had no patience to see all 10 moves deep. The last
time I put my computer to work at night and 8 hours later I disconnected it.
Then branching factor should be already around 22. Big surprise after previous
7.
For depth that I look, it was:
Moves Time Branching factor NPS
4 0.219 sec 49k
4.75
5 1.043 sec 43k
4.89
6 5.38 sec 43k
4.4
7 22.5 sec 50k
9.01
8 3 min 24 sec 77k
6.65
9 22 min 44 sec 111k
I will try to put this position once again this Friday for 10 moves. I do go to
work in the morning, so I expect that computer could work entire night and up to
midday. I hope that nobody will use it at my absence. I am curious to see how
much time this position take. I do remember other very strange, probably much
more impressive position where branching factor went even to 115.
Conditions are usual. Celeron 600Mhz. No hash.
Cheers,
Leonid.
>Cheers,
>Heiner
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