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Subject: Re: Nolot Bxh7 and deep thought/deep blue

Author: Jeremiah Penery

Date: 23:19:29 01/12/00

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On January 12, 2000 at 16:15:27, Bruce Moreland wrote:

>On January 12, 2000 at 13:43:10, Bruce Moreland wrote:
>
>>On January 12, 2000 at 10:02:08, Vincent Diepeveen wrote:
>>
>>>Let's zoom into position #8 not found by Deep Thought
>>>
>>[D]r3rbk1/ppq2ppp/2b1pB2/8/6Q1/1P1B3P/P1P2PP1/R2R2K1 w - - bm Bxh7; 8
>>>
>>>This position is of course in nolot as PC programs don't extend such
>>>lines too deeply. Just like the other nolots it only has to do with
>>>king safety and a lot of forced moves around the king.
>>>
>>>[c] ==> check extension
>>>[s] ==> singular best move extension
>>>[f] ==> forced move (a forced move is singular too) extension
>>>
>>>the TACTICAL line needed to find Bxh7:
>>>
>>>Bxh7+     Kxh7[c]
>>>Qh5+      Kg8[c]
>>>Rd4[s]    gf6[f]
>>
>>Hsu points out that gxf6 is bad, and suggests that Bf3! holds.
>>
>>bruce
>>
>>>Rg4+[s]   Bg7[c]
>>>Qh6[s]    Kf8[f]
>>>Rxg7      Rec8
>>>Qxf6      Be4[f]     (otherwise rh7-h8 mate)
>>>Rae1[s]   Bf5[f]
>>>g4[s]     Bxc2[f]
>>>Rxe6[f]   Bd3
>>>Rg6[c]    Qc1+
>>>Kh2[c]    Qc7+
>>>f4[c]     Qc2+
>>>Kg3[c]    <any legal move>
>>>Qh8 mates in quiescencesearch.
>
>Mine finds this now.  The line in ply 15 after 2.5 hours is:
>
>+0.75 Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qxc2

Instead of Qxc2 here, I think black may still be able to save it with Qc5.  I'm
interested to know what Ferret thinks of this.



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