Author: Heiner Marxen
Date: 14:29:34 05/04/01
Go up one level in this thread
On May 04, 2001 at 15:55:08, Paul wrote: >On May 04, 2001 at 15:51:07, leonid wrote: > >>On May 04, 2001 at 15:35:34, Paul wrote: >> >>>On May 04, 2001 at 15:28:48, leonid wrote: >>> >>>>On May 04, 2001 at 15:16:22, Angrim wrote: >>>> >>>>>On May 04, 2001 at 14:45:27, leonid wrote: >>>>> >>>>>>Hi! >>>>>> >>>>>>Probably my previous position is too tough, then this (almost the same in >>>>>>appearance) is very easy to solve. >>>>>> >>>>>> >>>>>> >>>>>[D]RnqkqnR1/qBNbNBq1/QqQqQqQ1/BrQqQrB1/8/8/3P4/3K4 w - - >>>>>> >>>>>>Please indicate your result. >>>>>> >>>>>>Thanks, >>>>>>Leonid. >>>>> >>>>>Man thats an ugly looking position :) >>>>>proved that move e7xd5 wins, 6 turns >>>>>took 3970678 evals, 107873 expands, 62 second on my Athlon650 using pn^2. >>>>> >>>>>I tried this with my "normal" search, and it couldn't search 2 ply deep in >>>>>1 minute. the qsearch was totally killing it. >>>> >>>>I failed also twice on this position when tryed to put graphics for it. I even >>>>went to see of your message was not that needy graphics. >>>> >>>>Leonid. >>>> >>>>>Angrim >>> >>>Hi! >>> >>>Your second rank is fawlty! It had just a P ... nothing more? Is this the right >>>one? >>> >> >>Thanks, Paul! Position is flawless. Now I can print it for later reference. >> >>Salut, >>Leonid. > >In that case a solution is this following mate in 9: > >01:32 WM9 08 Qcxd7+ Qcxd7 Rxb8+ Qxb8 Nc6+ Qd6xc6 Bxf6+ Rxf6 Qgxf6+ Qxf6 Q5xf6+ >Qee7 Qexe7+ Kxc7 Bxb6+ Rxb6 Qaxb6# Chest agrees, with a slightly different PV: Qcxd7+ Qcxd7 Rxb8+ Qxb8 Nc6+ Qd6xc6 Bxf6+ Qxf6 Qgxf6+ Rxf6 Q5xf6+ Qee7 Rxf8+ Kxc7 Bxb6+ Rxb6 Qaxb6# and it found a second key move: Qexd7+ Qexd7 Rxf8+ Qxf8 Ne6+ Qd6xe6 Bxb6+ Qxb6 Q5xb6+ Rxb6 Qaxb6+ Qcc7 Rxb8+ Kxe7 Bxf6+ Rxf6 Qgxf6# Maybe this is just symetric, I did not check. Chest on a K7/600 with 350 MB hash needed 177 seconds (3 mins) for this. >The other one took too long, so I stopped Pretz, sorry! ;) > >ciao, >Paul No surprise! See my other followup: Chest found no mate in 12 in over 2 hours. Cheers, Heiner
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