Why is this position evaluated so?

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

Postby 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?

Postby soheil_hooshdaran » Mon Jul 04, 2016 11:16 am

What "chances" do you see "for both sides" in:
[FEN "1nbqr1k1/4rpb1/p2p1n1p/2pP2p1/Pp2P3/3B2B1/1PQN1PPP/R2N1RK1 b - - 0 17"] [SetUp "1"] *

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

Postby 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?

Postby soheil_hooshdaran » Wed Jul 06, 2016 6:31 am

The author gave a slight advantage to White. Why?
Here is the position:
[FEN "r1bq1bk1/pp3ppp/1n3n2/3P2B1/3N4/2N5/PP3PPP/1R2QBK1 b - - 0 15"] [SetUp "1"] *

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Wed Jul 06, 2016 6:44 am

Why does GM Grivas say that Black has the advantage in:
[FEN "r3rbk1/pp3pp1/1nppbq1p/8/1PP1PBn1/2N5/P1NQ1PPP/1R2RBK1 w - - 0 16"] [SetUp "1"] *

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Wed Jul 06, 2016 7:47 am

Where is White's initiative in:
[FEN "r1n1r1k1/1p1n1p2/2p1q2p/4b1p1/1PP1N3/5Q1P/5BP1/3RRBK1 b - - 0 26"] [SetUp "1"] *

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Wed Jul 06, 2016 7:56 am

[FEN "r1n1q1k1/1p1B2b1/2p2p1p/6p1/1PP5/1Q5P/5BP1/3R2K1 b - - 0 31"] [SetUp "1"] *
Black to move
Where is Whites initiative?

MartinCarpenter
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Re: Why is this position evaluated so?

Postby 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?

Postby 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: [FEN "r1bq1bk1/pp3ppp/1n3n2/3P2B1/3N4/2N5/PP3PPP/1R2QBK1 b - - 0 15"] [SetUp "1"] *


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?

Postby 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?

Postby 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?

Postby 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?

Postby 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?

Postby soheil_hooshdaran » Fri Jul 08, 2016 9:41 am

How come White didn't take the Rook?
[FEN "8/1b3p1k/pp4p1/4n3/P3P3/2N5/6rP/1BR4K w - - 0 24"] [SetUp "1"] *
[Event "?"]
[Site "?"]
[Date "1951.??.??"]
[Round "?"]
[White "William H.Huge"]
[Black "Oliver W. Lafrenier"]
[Result "0-1"]
[ECO "D60"]
[Opening "QGD: Orthodox defence, Botvinnik variation"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 Be7 6. Nf3 O-O 7. Bd3 dxc4 8.
Bxc4 c5 9. Rc1 a6 10. a4 b6 11. Ba2 Bb7 12. Qd3 cxd4 13. Nxd4 Ng4 14. Nxe6 Nxf2
15. Qxh7+ Kxh7 16. Bb1+ g6 17. Nxd8 Nxh1 18. Bxe7 Rfxd8 19. Bxd8 Rxd8 20. Kf1
Ne5 21. Kg1 Rd2 22. Kxh1 Rxb2 23. e4 Rxg2 24. Nd5 Rd2 25. Rf1 Bxd5 26. exd5 Rxd5
27. Ba2 Rd4 28. Bxf7 Nxf7 29. Rxf7+ Kh6 30. Rf6 Rxa4 31. Rxb6 a5 32. Ra6 Ra1+
33. Kg2 a4 34. Ra8 a3 35. Kf2 a2 36. Ke2 Rh1 0-1
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?

Postby 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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