Author: Uri Blass
Date: 09:16:06 08/31/05
Go up one level in this thread
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
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