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Subject: Re: Positional/Real Sacrifice

Author: Alexander Kure

Date: 16:49:44 11/30/99

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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



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