Author: Heiner Marxen
Date: 05:47:29 09/16/02
Go up one level in this thread
On September 14, 2002 at 19:39:32, leonid wrote: >On September 14, 2002 at 16:58:23, Heiner Marxen wrote: > >>On September 14, 2002 at 10:44:49, leonid wrote: >> >>>On September 14, 2002 at 10:14:52, Paul wrote: >>> >>>>On September 14, 2002 at 09:47:21, leonid wrote: >>>> >>>>>On September 14, 2002 at 09:26:25, leonid wrote: >>>>> >>>>>>On September 14, 2002 at 08:51:31, Paul wrote: >>>>>> >>>>>>>On September 14, 2002 at 07:55:35, leonid wrote: >>>>>>>>Still, maybe, You will be tempted for something more heavy and I this way will >>>>>>>>be able to find more on this position: >>>>>>>> >>>>>>>>[D]2qRQq2/p6P/q1BqqR1N/r6B/n1QNQQ1B/r6k/b1QKNP1q/bq4qn w - - >>>>>>>> >>>>>>>>On description of this mate I can see that it was solved by selective in 13 >>>>>>>>moves but brute force search went not up to the end in order to find shortest >>>>>>>>move. Brute force search, without finding any mate, went only 9 moves deep. >>>>>>> >>>>>>>This one was indeed a lot more difficult, mine didn't fare so well here: >>>>>>> >>>>>>>06:49 WM11 07 Q8xe6+ Qdxe6 Qff3+ Rxf3 Qxf3+ Kxh4 Nhf5+ Rxf5 Nxf5+ ... >>>>>>> >>>>>>>So it found a mate in 11 in almost 7 minutes, with an incomplete pv ... these >>>>>>>d#*&#@rned hashtables ;) ... will have to think about this ... any tips anyone? >>>>>>> >>>>>>>>Please indicate Your result. >>>>>>>> >>>>>>>>Thanks, >>>>>>>>Leonid. >>>>>>> >>>>>>>Thanks for your mates as usual ... >>>>>> >>>>>>Thanks, Paul! >>>>>> >>>>>>Now I can see that second one is no far then 11 moves. I can even put this >>>>>>position at 10 moves by brute force for night. If braching factor will not >>>>>>suddenly jump, then it should be enough time for me for finding its depth. >>>>>> >>>>>>First position have excellent time! >>>>>> >>>>>>Mine, on usual setting, found mate in 1.75 sec. >>>>>> >>>>>>Cheers, >>>>>>Leonid. >>>>> >>>>>Paul, just after writing my message, I started to see second position in my file >>>>>to indicate 11 moves. When I finally found it (I not indicate before on what >>>>>page I had it), I looked that it was in reality solved by selected in 11 moves, >>>>>just as You said. Before upper part of page was covered with page keeper and it >>>>>is how I missed some additional description. If I knew this yesterday, when I >>>>>found this position, I could put search for 10 moves by brute force at night. >>>> >>>>Hey!! ... so you tricked us ... that's not fair ... I would have found it much >>>>faster if I'd known! ... just kiddin' ... :) >>> >>>I was actually tricked by myself. I did expected that this position was very >>>difficult since I could see that it was solved by very slow selective and only >>>at 13 moves. 13 moves at large default setting (I use it before searching by >>>much easier solution) took 13.5 minutes to solve. When I looked into 11 moves >>>selective solution its paramether indicated that solution was almost simple. >>> >>> >>>>>Selective in 11 moves was solved in 18 seconds. Usual setting. >>>> >>>>Not bad at all ... you really should implement hash to get a bit faster though >>>>... ;) >> >>Chest is still running for depth 11, but after 3478 secs has already reported >>that there is no mate in 10. So, we are already sure, that 11 is minimal >>depth. > >Paul just said to me that there are no mate in 10. > >># 4 0.09s 17kN [ 10.28] 1.07 737- 0 >># 5 0.96s [ 10.67] 137kN [ 7.88] 1.21 8654- 0 >># 6 6.32s [ 6.58] 791kN [ 5.79] 1.49 66512- 0 >># 7 31.30s [ 4.95] 3675kN [ 4.65] 2.11 351756- 0 >># 8 143.98s [ 4.60] 16349kN [ 4.45] 2.73 1718242- 7352 >># 9 668.36s [ 4.64] 73337kN [ 4.49] 3.46 8452143- 5252957 >># 10 3477.74s [ 5.20] 373030kN [ 5.09] 4.02 45004182- 41804949 Chest completed its job: # 11 16881.61s [ 4.85] 1819969kN [ 4.88] 4.43 226032315- 222833082 PV: Q8xe6+ Qdxe6 Qff3+ Rxf3 Qxf3+ Qgg3 Nf4+ Kxh4 Qxg3+ Qxg3 Nf3+ Qxf3 Ng2+ Kh3 Qh4+ Kxg2 Bhxf3+ Kg1 Qxh1+ Kxf2 Qg2# Q8xe6+ Qdxe6 Qff3+ Rxf3 Qxf3+ ...+8 Qhg3 Nf4+ ...+3 -*- Nf4+ ...+2 Qcxe6 Nxg1+ Qbxg1 Qef5+ ...+5 Qhxg1 Bg4+ ...+5 Rf5 Bg4+ Kxh4 Nxf5# Qxg4 Qxg4# Qg4 Qfxg4# I.e. the key move is unique, and Chest needed 4.9 hours. Cheers, Heiner
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