Computer Chess Club Archives


Search

Terms

Messages

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

Author: John Merlino

Date: 14:11:54 02/05/04

Go up one level in this thread


On February 05, 2004 at 16:52:25, Darren Rushton wrote:

>On February 05, 2004 at 16:38:37, George Tsavdaris wrote:
>
>>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
>>>>>  [D]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?
>>
>>Can you find an improvement for black in this line:
>>
>>1.Rxg8 Nxg8 2.g6 hxg6 3.h7 Nh6 4.h8Q Nf5 5.Ke5 b3 6.Qc8+ Kb4 7.Qc1 with a clear
>>win.
>>
>>If instead 2...b3 3.gxh7 b2 4.hxg8Q b1Q  and a tablebase mate in 37 for white
>>with 5.Qc8+
>
>Disagree; after 2.g6 hxg6?? loses immediately, black plays Ne7 instead.
>Strongest is:
>1.g6 Nxg6 2.Rc8+ Kd4 3.Rxg8 Ne5 4.Rg7 Ke4 5.Rb7 Nd3

After 1.Rxg8 Nxg8 2.g6 Ne7 3.Kxe7 and White wins. Any 3rd move by Black (except
3...hxg6, of course) is followed by 4.hxg7 and a tablebase win. 3...hxg6 is also
a tablebase win.

Also, I can't find a clear win for White after 1.Rb8 Nxh6! 2.gxh6 (or 2.Kxe7
Nf5+) Nc6.

jm



This page took 0.03 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.