Author: Bernhard Bauer
Date: 08:14:52 08/31/05
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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
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