Author: leonid
Date: 05:18:49 07/22/01
Go up one level in this thread
On July 22, 2001 at 07:18:33, Heiner Marxen wrote:
>On July 21, 2001 at 12:35:35, Gian-Carlo Pascutto wrote:
>
>>On July 21, 2001 at 04:39:07, leonid wrote:
>>
>>>Hi!
>>>
>>>Probably next position will be easy for every program.
>>>
>>>[D]knqb2Rq/qbq2Qq1/nq2Nr2/q2QQQ2/2NQQ3/1QrQ4/Rq4BB/q5QK w - -
>>>
>>>Please indicate your result.
>>>
>>>Thanks,
>>>Leonid.
>>
>>2.5 seconds
>>
>>Sjeng: prove
>>
>>Max time to search (s): 200000
>>
>>P: 0 D: 100000000 N: 186965 S: 186964 Mem: 7.85M Iters: 2132 MaxDepth: 29
>>Time : 2.500000
>>This position is WON.
>>PV: e6c7 a6c7 d5b7 b6b7 d4a7 a5a7 e4b7 c8b7 g2b7
>>
>>
>>--
>>GCP
>
>For Chest to prove the shortest mate this is much harder: after 13.4 hours
>Chest says "No solution in 11 moves." (K7/600 with 350 MB hash)
>The EBF is not bad, but also not good enough: starting with depth=8 black
>has used up the easy checks, and the EBF doubles:
>
> depth time EBF[T] EBF[N] hash-speed
># 1 0.00s 0kN 0.87 1- 0
># 2 0.00s 0kN 1.00 1- 0
># 3 0.01s 1kN [ 8.23] 0.92 99- 0
># 4 0.10s [ 10.00] 4kN [ 5.22] 1.02 595- 0
># 5 0.47s [ 4.70] 19kN [ 4.21] 1.23 2521- 0
># 6 2.02s [ 4.30] 85kN [ 4.56] 1.46 10289- 0
># 7 8.82s [ 4.37] 417kN [ 4.91] 1.71 42237- 0
># 8 69.52s [ 7.88] 3568kN [ 8.56] 1.84 335095- 0
># 9 595.42s [ 8.56] 31094kN [ 8.72] 2.13 2951616- 802
># 10 4980.94s [ 8.37] 260558kN [ 8.38] 2.45 25194399- 16446522
># 11 48350.46s [ 9.71] 2531658kN [ 9.72] 2.62 242162073- 233414172
>
>Depth=12 is estimated to need more than 5 days :-( So Chest quits here.
>Apparently, Chest needs a fast mate search mode to not frustrate its author
>so often :-)
>
>Cheers,
>Heiner
Thanks, Heiner!
As if happened very often, you already accomplished the most important job
before quitting. My selective found mate in 12. So, it is mate in 12.
Our branching factor were very close, taking in consideration difference in
hash. I went only 9 moves that took already 1 hour.
4 moves - 0.21sec
4.5 - branching factor
5 moves - 0.98 sec
4.94
6 moves - 4.89 sec
7.42
7 moves - 36.31 sec
9.045
8 moves - 328 sec
10.9
9 moves - 59 min 51 sec
Seleron 600Mhz. LLchess. No hash.
Mate found by selective in 12 moves. Time - 0.38 sec
Cheers,
Leonid.
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