Author: blass uri
Date: 02:48:26 12/01/99
Go up one level in this thread
On December 01, 1999 at 03:42:20, Ricardo Gibert wrote: >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. I do not agree that Rebel is too optimistic after 3 plies. Uri
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