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Subject: Re: Test Position = Study by David Przepiorka [Vorwärts, 1910]

Author: Dieter Buerssner

Date: 14:56:38 02/05/04

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On February 05, 2004 at 15:52:53, Will Singleton wrote:

>On February 05, 2004 at 15:49:09, George Tsavdaris wrote:
>
>>On February 05, 2004 at 15:07:27, José Antônio Fabiano Mendes wrote:
>>
>>>  Study by David Przepiorka [Vorwärts, 1910]   vorwärts ==> onward/forward/ahead
>>>  R5n1/4n2p/4K2P/2k3P1/1p6/8/8/8 w
>>>  The only winning move is 1. Rb8 then 1...Kc4 2. Rxg8 Nxg8 3. g6 b3 4. gxh7 b2
>>>  5. hxg8=Q b1=Q 6. h7 Qe4+ 7. K moves, discovered check and White wins. Now we
>>>  understand the purpose of 1. Rb8, White King moves with check.
>>>  Source ==> "Ajedrez", Editorial Sopena Argentina, April 1978, page 191
>>
>>Well i think the immediate 1.Rxg8 is winning too (more easily according to
>>computers).
>
>I don't think that wins, as black can queen and get a perpetual (I think).  My
               ^^^^
>question is, after Rb8, how does white win after Nxh6?

I am a bit confused by your post. You answer to George, who suggested Rxg8 (by
"I don't think, that wins"), but your follow up question is about Rb8 (which is
in the post of JAFM). Perhaps, with that, you are referring to the JAFM-post (I
am obviously no native English speaker - perhaps for a native speaker, it is
totally clear).

Anyway. I get +15 soon for Rxg8. Rb8 seems still to win. After Rb8 Nxh6, I get:

       239   0.006  20.02 15t  2.gxh6 Nc6 3.Rc8H Kb5H 4.Kd6H Na7H 5.Rc7H Kb6H
                               6.Rxh7H Nb5+H 7.Kd7H {HT}

This was after a little bit of backward analysis. I did not try, to get a huge
score back - just tried some sample variations, and all I tried ended in a win
for white. If black can draw this after Rb8 Nxh6 gxh6, this would probably mean,
that I have introduced an horrible bug into the engine. What is your move after
gxh6 ?

I am pretty confident, that I can prove a mate score for Rb8 (unless I
introduced some nasty bug).

Regards,
Dieter

PS. I had this posting in my browser for a while - wrote it while trying out
some thing. Possibly, others have said similar thing in between. If yes - sorry,
that I repeated it.




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