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Subject: Re: EPD position - value of pawn vs positional factors

Author: Will Singleton

Date: 22:21:59 10/28/98

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On October 28, 1998 at 21:56:53, Peter Kappler wrote:

>On October 28, 1998 at 15:09:21, Will Singleton wrote:
>
>>All,
>>
>>In a game last night on ICC, my program had the following position:
>>
>>r2q1rk1/pp1bppbp/5np1/2Pp4/5B2/2NBP3/PPP2PPP/R2Q1RK1 b - -
>>
>>White's last move was 10.dxc5.  The logical move is 10...Qa5, allowing for the
>>recapture of the white pawn.  But it switched in ply 7 to 10...Rc8, permitting
>>11.b4, leaving white a pawn up.
>>
>>I thought this was a bug until I ran gnuchess on it, and it also switched to
>>10...Rc8 after awhile.  Hiarcs, on the other hand, shows +0.80 for white after
>>that move.
>>
>>My thought is that some programs might consider white's position weakened enough
>>to offset the loss of the pawn (looks like white might end up with 2 doubled
>>pawns).  But I consider 10...Rc8 a bad move, since it gives up a pawn
>>speculatively, with no real advantage to show for it.  I lost the game (against
>>Hossa), unable to push any advantage.
>>
>>What do other programs think of 10...Rc8?
>>
>>Will
>
>
>Will,
>
>I think 10...Rc8 is a good move.  You mentioned that this allows 11.b4, holding
>the pawn, but 11...b6 seems like a good response.  I don't see any way for White
>to hold on to that pawn.  In fact, I think 11.b4 is a weak move which weakens
>White's queenside pawn structure, and gives Black's g7 bishop more scope.
>
>Oh, my program likes 10...Qc8.
>
>--Peter


Hi Peter,

I'm not the best chessplayer in the world, so I will have to admit to a certain
level of confusion re your comments.  You say the line 10...Rc8 11.b4 b6 is good
for Black??  What about 12.Ba6?

You say that White can't hold the pawn, but I don't see it.  What is the
continuation?

Will




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