Author: leonid
Date: 12:17:28 05/06/01
Go up one level in this thread
On May 06, 2001 at 13:26:26, Heiner Marxen wrote: >On May 06, 2001 at 11:55:05, Paul wrote: > >>On May 06, 2001 at 10:13:27, leonid wrote: >> >>>On May 06, 2001 at 06:22:26, leonid wrote: >>> >>>>Hello! >>>> >>>>If you would like to solve a mate, you can try this moderate position: >>>> >>>>[D]Qqrkrq1Q/1QqqqqQ1/qBbnnbBq/1NQ2QN1/8/2Q2Q2/3RR3/3K4 w - - >>>> >>>>Please indicate your result. >> >>Ok ... my guess, before Heiner moves in with his heavy artillary, a mate in 9: >> >>06:18 WM9 09 Bxc7+ Qbxc7 Qxc7+ Qxc7 Qxd6+ Qcxd6 Nxe6+ Qexe6 Qfxf6+ Re7 Rxd6+ >>Qxd6+ Qxd6+ Bd7 Qhxf8+ Qxf8 Qcc7# > >Well, 6:18 is not exactly fast, right? >I will try this one later, have started with the second one. See below. > > >>>>Thanks, >>>>Leonid. >>> >>>After sending this last position I went to see its branching factor on one >>>professional program. I took it recently from the Web. After thinking for a >>>while program stopped breathing. Sudden death. Then I felt me a little bit >>>guilty by presenting upper position for Sunday. Better will be the next one that >>>is really. I did it yesterday before comming to the position that is above. >> >>No ... it wasn't too hard, Leonid! You must really be a nice guy, thinking about >>our feelings like that, thanks! ;) > >The one who tortures us daily with bizarre mate problems? :-)) > >But seriously: if they are too hard, he will not get much helpful response. >OTOH, we may feel pressed to improve our programs... > > >>>[D]nqrkrqn1/1QqnnqQ1/1BnbbnB1/BQNNNNQB/8/8/3RR3/3KQ3 w - - >>> >>>Please indicate your result. >>> >>>Thanks, >>>Leonid. >> >>This one's a bit too easy, haha, found a mate in 6: Thanks, Heiner! I see now that this mate is very helpful to keep. It is not every position that can contain 6 responses. Salut, Leonid. >> >>00:04 WM6 06 Qxc7+ Nxc7 Nxd6 Nxa5 Qxd7+ Nxd7 Nc6+ Nxc6 Ncb7+ Qxb7 Nxb7# > >For sure it really is a mate in 6: >ChestMate = Pretzmate /* -1 */; /* bugfix by Heiner */ > >It has multiple solutions, there are 6 key moves: > >Bxc7+ Nxc7 Qxc7+ Bxc7 Bxf7 Bxd5 Nxc6+ Nxc6 Rxe8+ Qxe8 Qxe8# >Bxf7 Nxc5 Nxc6+ Nxc6 Q7xc6 Bd7 Rxe8+ Bxe8 Qexe8+ Qxe8 Qxe8# >Nxc7 Bb3+ Qxb3 Nxc7 Nxc6+ Nxc6 Qbxf7 Nce5 Qxd7+ Nxd7 Qxd7# >Nxd6 Naxb6 Q7xb6 Nxa5 Nexf7+ Bxf7 Nf4 Bb3+ Qxb3 Ne5 Ndb7# >Qxc7+ Nxc7 Bxc7+ Bxc7 Bxf7 Bxd5 Nxc6+ Nxc6 Rxe8+ Qxe8 Qxe8# >Qxf7 Qxf7 Nxf7+ Bxf7 Nxd6 Nde5 Nxf7+ Nxf7 Nxc7+ =*= N7e6# > >That took 28.4 minutes (!) (K7/600, 350MB hash) > >depth seconds ># 3 0.15 0.99 386- 0 ># 4 4.19 1.25 9199- 0 ># 5 95.47 1.55 219507- 0 ># 6 1704.26 1.86 4219473- 9977 > >Chest needed an average of 2.5 black moves to refute at the top level, >what is unusually large, and contributes to the comparatively large time. > >>Have a nice Sunday, >>Paul > >Thanks! Dito! >Heiner
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