Author: Slater Wold
Date: 07:51:21 08/14/02
Go up one level in this thread
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 > 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. 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. Some engines get this no problem, some don't get it at all.
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