Author: Robert Hyatt
Date: 07:13:26 01/05/03
Go up one level in this thread
On January 05, 2003 at 03:09:06, Uri Blass wrote: >On January 04, 2003 at 21:52:32, Robert Hyatt wrote: > >>On January 04, 2003 at 21:41:31, scott farrell wrote: >> >>>On January 04, 2003 at 15:01:34, Robert Hyatt wrote: >>> >>>Yes it is about the knight on a8. A human doesnt need a horizon to see the >>>knight on a8 should be scored way down, and will probably be lost, but most >>>programs if it cant see it being lost inthe qsearch, consider the piece to be >>>safe. >> >>Maybe. Crafty has code to hate a knight on a8, and the PV it had showed the >>knight getting back out quickly. Here is the PV: >> >> 15 1:44 0.96 2. Nxb6 Nxd3 3. Nxa8 Nf4 4. Rfe1 Nf6 >> 5. Re5 b6 6. Nc7+ Kd7 7. Na6 Bd6 8. >> Re3 N4xh5 9. Rae1 Nxg3 10. fxg3 >> >>As you see, in that variation, the knight gets out pretty quickly. The >>only issue is does white have time to do that, or does white have to handle >>some other threat by black that prevents getting the knight out? That is not >>easy to compute for me (as a human) or crafty (as a computer). >> >>My gut reaction is that this is winning for _white_... not black... if white >>plays well. If white doesn't realize that the knight is dangerously close to >>being lost on a8 and take immediate action to extricate it, I could easily see >>a program losing that knight by a misstep here or there... > >5...b6 in your main line seems wrong > >5...Bd6 6.Ra5 Bb8 and the knight cannot get out. > >Uri As I said, that might be possible. Crafty knows that the knight is bad on a8, and it wants to get it out. It also knows that black wants to keep it there. I didn't try to study this enough to see if it happens or not...
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