Author: Terry McCracken
Date: 08:55:53 08/31/05
Go up one level in this thread
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
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