Author: Uri Blass
Date: 11:39:53 01/27/01
Go up one level in this thread
On January 27, 2001 at 00:58:01, Heiner Marxen wrote: >On January 25, 2001 at 11:13:10, leonid wrote: > >>On January 25, 2001 at 10:57:06, José Antônio Fabiano Mendes wrote: >> >>>On January 25, 2001 at 09:57:29, leonid wrote: >>> >>>>Hi! >>>> >>>>If you like to solve some average mate position... >>>> >>>>[D]R1brkrnR/1N1qqqbN/3qqq1B/1B1bQNbQ/1bn1Q2B/3Q1Q2/3Q1Q2/1K6 w - - >>>> >>>>Please indicate your result. >>>> >>>>If you can depose here just one forced mate position from some world chess >>>>championship, it will be nice. Indicate exactly where this competition happened. >>>>I speak about championship where human found forced mate. Never mind if this >>>>championship was between two humans or man and machine. It could give an >>>>opportinity to see which program is best in real life situation. Even more that >>>>this, it will permit to tune selective search for forced mate to make it more >>>>effective. >>>> >>>>Thanks, >>>>Leonid. >>> >>> As written the second row [1N1qqqb] accounts for only 7 squares, >>> that's why the diagram is not displayed. JAFM >> >>Thanks for indicating mistake! I hope that now it will come in graphics. At list >>this time I will look if it is really there. >> >>Leonid. > >Well, you askeed for it, didn't you? According ot Chest, 5 moves solve it >as a mate in 9 moves: nor one, not two... five. I suspect, you did not >really know the solution?!?! > >Nxf6+ >Nfxd6+ >Nbxd6+ >Q5xd5 >Qxe6 > >Let me try to find something like a PV for everybody: > >Nxf6+ B7xf6 Nfxd6+ Bxd6 Q5xd5 Bde5 Rxc8 Na3+ Qxa3 Bg7 Bxd7+ Q6xd7 >Qfxf7+ Rxf7 Qfxf7+ Qxf7 Qxd7# > >Nfxd6+ Bxd6 Q5xd5 Be5 Nxf6+ B7xf6 Rxc8 Na3+ Qxa3 Bg7 Bxd7+ >Q6xd7 Qfxf7+ Rxf7 Qfxf7+ Qxf7 Qxd7# > >Nbxd6+ Bxd6 Nxf6+ B5xf6 Nxg7+ Bxg7 Qhxf7+ Q6xf7 Qxf7+ Bxf7 Bxd7+ Bxd7 >Qxe7+ Nxe7 Qxe7+ Bxe7 Qxd7# > >Q5xd5 Na3+ Qxa3 Qde5 Nxf6+ B7xf6 Bxd7+ Bxd7 Ng7+ Bxg7 Rxd8+ Qxd8 >Qhxf7+ Qxf7 Qfxf7+ Rxf7 Qfxf7# > >Qxe6 Nxd2+ Qdxd2 Bxe4+ Qfxe4 Qb2+ Qxb2 Qd1+ Qxd1 Qexe6 Nxg7+ Ke7 >Qxd7+ Rxd7 Qxe6+ Qxe6 Qxf8# > >This is, of course, a small extract of the 60000 lines solution output >from Chest... ;-) > >15.3 hrs, K7/600 with 350MB hash. ;-) > >Heiner Chessmaster6000 believes that white does not need the bishop at h4 to force mate in 9. Nxf6+ is enough to force mate in 9 without this bishop Maybe reducing the number of pieces of white can force only one solution for the mate in 9 problem. Uri
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