Author: Heiner Marxen
Date: 10:26:26 05/06/01
Go up one level in this thread
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: > >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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