Author: Vincent Lejeune
Date: 06:31:07 08/31/05
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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.
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