Author: Robert Hyatt
Date: 12:05:08 08/14/02
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On August 14, 2002 at 10:51:21, Slater Wold wrote: >On August 14, 2002 at 10:44:00, Robert Hyatt wrote: > >>I have looked at this more carefully... >> >>There are interesting things going on that need even further analysis, >>but my P3-750 notebook grabs onto b2 at 8 seconds. But at depth=12 it >>drops to draw score and sticks there until depth 14... I am now >>pretty sure this is a null-move issue because of the single tempo >>that is at stake. Both sides threaten to promote and both sides must >>stop the other while advancing its plan at the same time. A perfect >>case for null-move breaking things... >> >>Here is the output (so far): >> >> (2) 10-> 5.76 1.53 1. ... Bc4 2. Re1 b2 3. Rb1 Bd3 4. >> Rxb2 Bxg6 5. Rb7 d5 6. Rc7+ Kd6 7. >> Rc8 >> 11 6.41 1.55 1. ... Bc4 2. Re1 b2 3. Rb1 Bd3 4. >> Rxb2 Bxg6 5. Rb8 d5 6. Rg8 Bf5 7. Rd8 >> 11 8.97 ++ 1. ... b2!! >> 11-> 11.35 1.14 1. ... b22 >> 12 26.08 ++ 1. ... b2!! >> 12 59.32 0.00 1. ... b2 2. g7 Bh7 3. Re1 Kb4 4. Re8 >> Ka3 5. Rb8 Ka2 6. Ra8+ Kb3 7. Rb8+ >> Ka2 >> 12-> 1:00 0.00 1. ... b2 2. g7 Bh7 3. Re1 Kb4 4. Re8 >> Ka3 5. Rb8 Ka2 6. Ra8+ Kb3 7. Rb8+ >> Ka2 >> 13 1:08 0.00 1. ... b2 2. g7 Bh7 3. Re1 Kb4 4. Re8 >> Ka3 5. Rb8 Ka2 6. Ra8+ Kb3 7. Rb8+ >> Ka2 >> 13-> 1:10 0.00 1. ... b2 2. g7 Bh7 3. Re1 Kb4 4. Re8 >> Ka3 5. Rb8 Ka2 6. Ra8+ Kb3 7. Rb8+ >> Ka2 >N> 14 1:16 ++ 1. ... b2!! > >So your notebook gets a better score and in better time, than my 2x1.73Ghz >machine? Ah, the beauty of SMP. Note that I am running version 19.0, which is a bit different than yours. That probably accounts for much of the difference. > >I see you had the display problem too. :) > >I would think it would be easy to see Bh7 stops the promotion of white just long >enough to promote, and of course, win. > >The win is deep, but it's pretty textbook. I just thought it would be "easy" >(or at least, easier) for computers. I let it run for a _long_ time and don't see a win. I saw scores of about +2 eventually, but nothing like +9 or whatever... > >Some engines get this no problem, some don't get it at all.
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