Author: Ricardo Gibert
Date: 00:28:06 09/21/99
Go up one level in this thread
On September 20, 1999 at 15:04:36, KarinsDad wrote: >On September 20, 1999 at 14:42:27, Robert Hyatt wrote: > >[snip] >> +---+---+---+---+---+---+---+---+ >> 8 | | | | | | | *K| | >> +---+---+---+---+---+---+---+---+ >> 7 | *P| *P| | | | *P| *P| *P| >> +---+---+---+---+---+---+---+---+ >> 6 | | | | | | | | | >> +---+---+---+---+---+---+---+---+ >> 5 | | | | | | | | | >> +---+---+---+---+---+---+---+---+ >> 4 | | | | | | *B| | | >> +---+---+---+---+---+---+---+---+ >> 3 | | | | | | | N | | >> +---+---+---+---+---+---+---+---+ >> 2 | P | P | P | | | P | P | K | >> +---+---+---+---+---+---+---+---+ >> 1 | | | | | | | | | >> +---+---+---+---+---+---+---+---+ >> a b c d e f g h >> >>This is the position prior to the last one. I (as black) played Bxg3. Old >>crafty promptly plays Kxg3 and now it has to watch out for the passed black >>pawn on the h file (eventually). new crafty plays fxg3 and black isn't going >>to make any passer. >> > >Looks impressive Robert. > >One question: How does this specific example work with rooks left on the board? >Having a position low in the graph of this example does not have a problem due >to the normal search preventing king threats and mate. However, if this pawn >evaluation is done 18 ply down, I could see a potential problem such as: > > +---+---+---+---+---+---+---+---+ > 8 | | | | | | | *K| | > +---+---+---+---+---+---+---+---+ > 7 | *P| *P| | | R | *P| *P| | > +---+---+---+---+---+---+---+---+ > 6 | | | | | | | | *P| > +---+---+---+---+---+---+---+---+ > 5 | | | | *R| | | | | > +---+---+---+---+---+---+---+---+ > 4 | | | | | | *B| | | > +---+---+---+---+---+---+---+---+ > 3 | | | | | | | N | | > +---+---+---+---+---+---+---+---+ > 2 | P | P | P | | R | P | P | K | > +---+---+---+---+---+---+---+---+ > 1 | | | | *R| | | | | > +---+---+---+---+---+---+---+---+ > a b c d e f g h > >Bxg3, fxg3 Rh5++ Oh oh! The immediate Rh5++ improves, but we understand the point you want to make. > >Do you have other code which forces you to check for king safety a few ply below >the pawn evalutation or do you just realize that event horizon is a problem >regardless and that if you are 18 ply down, there may be an alternative before >the actual position gets there anyway? > >KarinsDad :)
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