Author: Ricardo Gibert
Date: 00:42:20 12/01/99
Go up one level in this thread
On November 30, 1999 at 22:19:28, Robert Hyatt wrote: >On November 30, 1999 at 19:49:44, Alexander Kure wrote: > >>On November 30, 1999 at 17:45:23, Robert Hyatt wrote: >> >>>On November 30, 1999 at 04:40:20, Ed Schröder wrote: >>> >>>>On November 30, 1999 at 04:12:22, Jeremiah Penery wrote: >>>> >>>>>On November 30, 1999 at 03:35:54, Ed Schröder wrote: >>>>> >>>>>>As said we must have a different view on king safety even on the basics as >>>>>>this case for me is so crystal clear: QRRB all pointed at a naked king, the >>>>>>king having hardly any escapes, >>>>> >>>>>True, but all it takes to wreck the whole thing is ONE escape for the black >>>>>king, as long as black doesn't lose material doing it. In this case, I don't >>>>>think there is an escape, but it will happen in other positions. >>>> >>>>And SEARCH will filter that. >>>> >>>>Ed >>> >>>not at 1-2-3 plies it won't. If you don't see the escape, you make the >>>sac. If I don't see the win, I don't make it. That is a subtle difference. >>>You want the search to refute the positional sac. I want the search to justify >>>the sac... >> >> >>You cannot justify anything with a 1-2-3 ply search. But after 5-7 plies it >>should be clear that Bxh6 is winning, providing your king safety/attack is well >>implemented: >> >>2-3 pawns + dead opponent's king > bishop, but if "dead opponent's king" -> 0 in >>your evaluation this inequality busts. >> >>Nimzo 7.32 for example has a very limited concept of king safety and does not >>find Bxh6 after 10 plies! >> >>Greetings >>Alex > > >You are missing the point. Rebel liked things after Bxh6 gxh6 Qxh6. What >happens if it gives up a pawn at ply-1, so that it can force this position >at ply=10? Now it can't search beyond the above sequence, and it chooses to >enter this based on that 1 ply search. And by the time you discover that it >doesn't work, you are already 'in for a pawn..." > >what to do then??? Yes. After 3 plies, Rebel is too optimistic, but after 5 plies crafty is too pessimistic. Both programs need work on their evals.
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