Author: John Merlino
Date: 11:45:08 05/15/03
Go up one level in this thread
On May 15, 2003 at 13:42:58, Drexel,Michael wrote: >On May 15, 2003 at 13:17:09, John Merlino wrote: > >>On May 15, 2003 at 12:36:35, F. Huber wrote: >> >>>On May 15, 2003 at 10:14:59, Art Basham wrote: >>> >>>>White wins with 1. Ng6+...etc. >>>> >>>>[D]1n6/8/8/R3Np1K/1N3k2/1R6/1P5P/3n4 w - - 0 1 >>>> >>>>any programs ann. mate at move one? >>>>This is difficult for my engines to see... >>> >>>ChestUCI Ver.2.5: >>> >>>Search for Mate in 12 ... >>>Mate in 5 found ! (1 Solution in 00:04) >>>D5 00:04 M5 Nc4 Na6 Rg3 Nxb4 Nd2 Nd5 Rxd5 Nxb2 Rf3 >>> >>>Regards, >>>Franz. >> >>You must have done something wrong with Chest, as Nc4 is a mate in 6, according >>to CM9000. Actually, there are SIX moves that lead to mate in 6 -- Nf3, Rh3, >>Rg3, Nc2, Nf7 and Nc4. >> >>Additionally, CM9000 says that Ng6 is a mate in 11 (or possibly better): >> >>1.Ng6+ Ke4 2.Re5+ Kd4 3.Nc2+ Kc4 4.Rb4+ Kd3 5.Nd4 Nc3 6.Nf4+ Kd2 7.Nf3+ Kc1 >>8.Rc5 Kb1 9.Rxc3 Ka2 10.Nd2 Nd7 11.Ra3# >> >>jm > >John, do you know why Chessmaster has problems to find the mate in 5? >Here is the answer: > >1.Nc4!! Nd7 2.Re5!! Nxe5 3.Re3!! Nxe3 4.Nd2! > >[D] 8/8/8/4np1K/1N3k2/4n3/1P1N3P/8 b - - 0 4 > >Zugzwang I have never seen The King take so long to find a short mate. I think engine writers would say that "well, it found a mate in one more move in one second, so what's the big deal." But maybe it is a good test position after all. CM9000 (on a P3-550 with the default personality and a 32MB hash), in standard analysis mode, did not find the Mate in 5 in under 10 minutes! Of course, in solve-for-mate mode, it finds it in 3 seconds.... :-) jm
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