Why is this position evaluated so?

Technical questions regarding Openings, Middlegames, Endings etc.
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Roger de Coverly
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Re: Why is this position evaluated so?

Post by Roger de Coverly » Thu Jun 30, 2016 9:42 am

soheil_hooshdaran wrote:What happens after
13...Nc6 14.Nd5 in:
My immediate thought was that White wins, which makes it puzzling as to why none of the players (including Karpov) who have reached this position have played it. A quick check with an engine reveals the resource. After 14. .. exd5 15. cxd5, Black has Nc5, hitting the Queen and blocking the c file. The suggested line after that is 16. Rxc5 dxc5 17. Nxc6 where White has sacrificed the exchange for a pawn and compensation.

A useful resource to know, as allowing Nd5 in such positions is usually best avoided.

soheil_hooshdaran
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Re: Why is this position evaluated so?

Post by soheil_hooshdaran » Mon Jul 04, 2016 11:16 am

What "chances" do you see "for both sides" in:

Roger de Coverly
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Re: Why is this position evaluated so?

Post by Roger de Coverly » Mon Jul 04, 2016 11:31 am

soheil_hooshdaran wrote:What "chances" do you see "for both sides" in:
"Chances for both sides" is usually author code for "someone might be winning, but I don't know who". In the particular position, material is level, but the pawn structures and resulting space are unbalanced. You can always ask an engine, but the assessment it gives may depend on the weighting its designers have given to various factors.

soheil_hooshdaran
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Re: Why is this position evaluated so?

Post by soheil_hooshdaran » Wed Jul 06, 2016 6:31 am

The author gave a slight advantage to White. Why?
Here is the position:

soheil_hooshdaran
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Re: Why is this position evaluated so?

Post by soheil_hooshdaran » Wed Jul 06, 2016 6:44 am

Why does GM Grivas say that Black has the advantage in:

soheil_hooshdaran
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Re: Why is this position evaluated so?

Post by soheil_hooshdaran » Wed Jul 06, 2016 7:47 am

Where is White's initiative in:

soheil_hooshdaran
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Re: Why is this position evaluated so?

Post by soheil_hooshdaran » Wed Jul 06, 2016 7:56 am


Black to move
Where is Whites initiative?

MartinCarpenter
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Re: Why is this position evaluated so?

Post by MartinCarpenter » Wed Jul 06, 2016 9:31 am

Absolutely everywhere. What a vile position for black.

Roger de Coverly
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Re: Why is this position evaluated so?

Post by Roger de Coverly » Wed Jul 06, 2016 9:37 am

soheil_hooshdaran wrote:The author gave a slight advantage to White. Why?
Here is the position:
White is a pawn up. If the advantage is only slight, the author must think there's enough activity and threats to eventually recapture on d5 keeping Black's game alive.

(Shouldn't you indicate who is to move in these positions? It might matter with the evaluation)

(edit) Playing Rd1 quickly looks obvious enough and then use your opponent's time to work out how to exploit the attempt to recapture on d5. (/edit)
Last edited by Roger de Coverly on Wed Jul 06, 2016 12:12 pm, edited 1 time in total.

soheil_hooshdaran
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Re: Why is this position evaluated so?

Post by soheil_hooshdaran » Wed Jul 06, 2016 9:52 am

He is losing the pawn.Isn't Be7 preparing the capture? (Avoiding the ruining of the castle position.)

Oh, and White is to move
Last edited by soheil_hooshdaran on Wed Jul 06, 2016 10:53 am, edited 1 time in total.

Michael Flatt
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Re: Why is this position evaluated so?

Post by Michael Flatt » Wed Jul 06, 2016 9:59 am

soheil_hooshdaran wrote:Why does GM Grivas say that Black has the advantage in:
Am I alone in wondering whether reproducing so many diagrams from GM Grivas's work might be infringing copyright in some way?

Also, it surprises me that the book wouldn't provide the necessary guidance for the reader to be able evaluate and understand the positions himself without having to post so many questions on them here.

soheil_hooshdaran
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Re: Why is this position evaluated so?

Post by soheil_hooshdaran » Wed Jul 06, 2016 10:54 am

soheil_hooshdaran wrote:He is losing the pawn.Isn't Be7 preparing the capture? (Avoiding the ruining of the castle position.)

Oh, and White is to move
Oh, maybe you're right...
Thans for noting that.

Kevin Thurlow
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Re: Why is this position evaluated so?

Post by Kevin Thurlow » Wed Jul 06, 2016 12:08 pm

"Am I alone in wondering whether reproducing so many diagrams from GM Grivas's work might be infringing copyright in some way?"

No.

soheil_hooshdaran
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Re: Why is this position evaluated so?

Post by soheil_hooshdaran » Fri Jul 08, 2016 9:41 am

How come White didn't take the Rook?

Last edited by soheil_hooshdaran on Fri Jul 08, 2016 10:37 am, edited 1 time in total.

MartinCarpenter
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Re: Why is this position evaluated so?

Post by MartinCarpenter » Fri Jul 08, 2016 9:52 am

The game record must be wrong somehow. That or a pig flew by.

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