Author: Terry McCracken
Date: 09:58:59 08/31/05
Go up one level in this thread
On August 31, 2005 at 12:16:06, Uri Blass wrote: >On August 31, 2005 at 11:55:53, Terry McCracken wrote: > >>On August 31, 2005 at 11:14:52, Bernhard Bauer wrote: >> >>>On August 31, 2005 at 09:31:07, Vincent Lejeune wrote: >>> >>>>On August 31, 2005 at 08:53:15, Bernhard Bauer wrote: >>>> >>>>>On August 31, 2005 at 05:53:26, Vincent Lejeune wrote: >>>>> >>>>>>[d]4K1nk/7p/8/7P/4N3/8/8/8 w - - 0 1 >>>>>> >>>>>>A subtle knight placement, who allow white king a triangulation ! >>>>>>Hard for null-mover because zugzwang, unless you have the KNPKNP EGTB ;o) >>>>> >>>>>Hard for crafty, even if you set selective to 0,0. >>>>>However, Zappa gives a mate in 30 within 10 seconds. >>>>>Spike 10 announces mate in 28 within 90 sec, but the mate goes up to 43 in 1:54. >>>>>Toga2 gives a score of 5.3 in 12 sec. The score goes up! >>>>>SOS 5.1 gives a mate in 18 in 23 sec. >>>>> >>>>>Huh! Why are some programs so good at this position and others take so long? >>>>>It cannot only be a null move issue. >>>>>Kind regards >>>>>Bernhard >>>> >>>>Toga2 doesn't support EGTB, that's why it didn't find the mate >>>> >>>>Here's the best sequence : >>>> >>>>[Event "?"] >>>>[Site "?"] >>>>[Date "????.??.??"] >>>>[Round "?"] >>>>[White "New"] >>>>[Black "?"] >>>>[Result "*"] >>>>[SetUp "1"] >>>>[FEN "4K1nk/7p/8/7P/4N3/8/8/8 w - - 0 1"] >>>> >>>>1. Kf8 h6 2. Kf7 Kh7 3. Nd6 Kh8 4. Ne8 Kh7 5. Ke6 Kh8 6. Kd6 Kh7 7. Kd7 Kh8 8. >>>>Ke6 Kh7 9. Kf7 * >>>> >>>>White succeed triangulation and we will the black knight because of zugzwang ! >>>>The shortest mate should be between 26 and 28 moves. >>> >>>The mate takes exactly in 28 moves. >>>Kind regards >>>Bernhard >> >>Are you sure? >> >>1.Kf8 h6 2.Kf7 Kh7 3.Nd6 Kh8 4.Ne8 Kh7 5.Ke6 Kh8 6.Kd6 Kh7 7.Kd7 Kh8 >>8.Ke6 Kh7 9.Kf7 Kh8 10.Nc7 Kh7 11.Ne6 Kh8 12.Nf8 Ne7 13.Ng6+ Kh7 14.Nxe7 >>Kh8 15.Ng6+ Kh7 16.Nf8+ Kh8 17.Kg6 Kg8 18.Nd7 Kh8 19.Kxh6 Kg8 20.Kg6 Kh8 >>21.Ne5 Kg8 22.h6 Kf8 23.h7 Ke7 24.h8=Q Kd6 25.Kf5 Kc5 26.Qc8+ Kb5 >>27.Qb7+ Kc5 28.Ke4 Kd6 29.Kd4 Ke6 30.Qf7+ Kd6 31.Qd7 Mate >> >>Terry > >Your line has mistakes >12..Ne7 is not the best move and 12...Nf6 is better. > >15.Nf5 is mate in 13 and is better than 15.Ng6+ that is mate in 15 >18.Ne6 is mate in 12 and is better than 18.Nd7 that is mate in 13 >25.Kf5 is a mistake and 25.Nf7+ mates faster. > >Uri Uri show proof for a change!
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