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Subject: Re: 2 pawns vs 1

Author: Thomas Blomquist

Date: 08:50:09 08/02/01

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On August 01, 2001 at 04:32:57, Peter Kappler wrote:

>On July 31, 2001 at 08:41:17, Robert Hyatt wrote:
>
>>On July 31, 2001 at 02:19:14, Mark Young wrote:
>>
>>>On July 31, 2001 at 01:05:53, Bruce Moreland wrote:
>>>
>>>>[D] 8/4ppbk/p5pp/3pP3/3B4/5P1P/PP3P2/6K1 b - - 0 1
>>>>
>>>>My thing got smashed by Ulf Andersson in this position.  It wants to play ... g5
>>>>and sticks with it for a long time on a P3/550, like something over a minute,
>>>>and it didn't have near enough time to avoid getting creamed.
>>>>
>>>>I'm pretty sure that ... g5 is dead lost.  I'm less sure about ... h5 or ... e6.
>>>>
>>>>A recent Yace switches away in about 12 seconds on one processor of my quad Xeon
>>>>450, and Crafty 18.10 takes 22 seconds to shift away.  I'm surprised about
>>>>Crafty since I'd thought that it should do better given its knowledge of
>>>>majorities.
>>>>
>>>>Anyone have any other insights?  If you would like to tell how fast another
>>>>program shifts away from ... g5, please include hardware.
>>>>
>>>>bruce
>>>
>>>Fritz 6, ChessTiger 14, GambitTiger 2.0 were the best I tested. All programs
>>>changed away from g5 in about 1 sec. Hardware: PIII 1000 Mhz 512K Ram.
>>
>>
>>On my machinek, I get e6 in about 6 seconds.  I think the problem here is that
>>black ends up with a protected passed pawn and in a piece-less ending, a
>>protected passed pawn is generally better than a simple distant majority.
>>The opponent can win the isolated passer while the protected passer sticks.
>>My evaluation here is -.44 (good for black) after e6.  Whether it will win
>>that or not is a guess.  Ulf is very strong of course...  I've played him
>>several games as well...
>
>
>Ulf was White in this game.
>
>I think the outside majority is the real story here, and Black is struggling to
>draw, or perhaps just losing.  I certainly can't see Black playing for a win.
>
>Here's a cute line that illustrates the power of that majority:
>
>1...e6 2 b4 Bf8 3 Bc5 Kg8 4 Bd6! Bxd6 5 exd6 Kf8 6 a4 Ke8 7 b5 axb5 8 a5 +-
>
>Certainly not a forced line, but amusing.
>
>-Peter


 black must stop the majority with 1...Kg8!

 for example 2 b4 Kf8 3 a4 Ke8 4 f4 e6 5 Bc5 h5... and black is ok.
 If we took away both bishops then 1...g5 wins.

 Thomas



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