Author: Ricardo Gibert
Date: 13:49:55 04/24/05
Go up one level in this thread
On April 24, 2005 at 16:45:12, John Merlino wrote: >On April 24, 2005 at 16:40:26, Ricardo Gibert wrote: > >>On April 24, 2005 at 16:28:06, Vincent Lejeune wrote: >> >>>On April 24, 2005 at 15:05:41, John Merlino wrote: >>> >>>>On April 24, 2005 at 14:31:52, Jack Lad wrote: >>>> >>>>>[d] 6nr/p2rkp1n/1pQRq1pp/1N2P3/8/4BN1P/PPP2PP1/2K4R w >>>>> >>>>>1.Nc7 or Nfd4? >>>>> >>>>>Or can they both mate in the same number of moves? >>>> >>>>Playing through the lines, it appears that: >>>> >>>>1.Nc7 is a Mate in 9. >>>> >>>>1.Nfd4 is a Mate in 11. >>>> >>>>jm >>> >>>3 best moves from ChessMaster 10 (AMD@3000+) >>> >>>Time Depth Score Positions Moves >>>9:38 1/13 Mate09 233251425 1.Nc7 Rxc7 2.Qxc7+ Kf8 3.Rxe6 Kg7 >>> 4.Nh4 Ng5 5.Bxg5 Ne7 6.Bf6+ Kh7 >>> 7.Qxe7 Rf8 8.Qxf8 fxe6 9.Qg7# >> >>You need to be careful with 1.Nc7. If CMX is anything like Ruffian, it will get >>a mate score, lose it, get it again only to lose it again while shifting from a >>best response to it of Rxc7, Nf8, Qf5 and Ngf6 all the while. Ruffian had a >>tough time with 1.Nc7. It took 5 times longer to reach the same depth of 14 that >1.Rxe6 got and ultimately lost the mate score. > >Chessmaster will never lose a mate score for the side to move. Once it reports a >mate, the only thing it can do is possibly report a shorter mate. > >Therefore, my "playing with the lines" (which you comment on in another post) >was merely to ensure that there was no shorter mate than the ones that The King >found relatively quickly. > >jm Okay. I did not know that CM enforced the property of never losing a mate score. Interesting.
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