Author: Robert Hyatt
Date: 20:24:49 08/14/02
Go up one level in this thread
On August 14, 2002 at 16:45:34, Slater Wold wrote: >On August 14, 2002 at 15:05:08, Robert Hyatt wrote: > >>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. > > >Ah! Makes sense. Seems like it's working, in this position anyway. > >> >> >> >>> >>>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... > >Do you think you can fix it? Or perhaps help it out? Or are you just not >worried about it? > I will certainly look at it carefully tonight... >> >> >> >>> >>>Some engines get this no problem, some don't get it at all.
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