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 » Fri Jul 08, 2016 10:14 am

soheil_hooshdaran wrote:How come White didn't take the Rook?
[FEN "8/1b3p1k/pp4p1/4n3/P3P3/2N5/6rP/1BR4K w - - 0 24"] [SetUp "1"] *


I would suspect the game has been incorrectly input. The names sound American, so it is possible the game was originally published in Descriptive notation. As recorded the moves Rxb2 and Rxg2 were played in succession. Although you are supposed to record in descriptive as RxQNP and RxKNP, if they had been recorded as RxNP, that's how the ambiguity might arise.

It's plausible then, that the moves were played in the order Rxg2 and Rxb2, which anyway looks a more logical way the play the position.

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Fri Jul 08, 2016 10:38 am

Why wrong?
Maybe just an oversight

MartinCarpenter
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Re: Why is this position evaluated so?

Postby MartinCarpenter » Fri Jul 08, 2016 12:07 pm

Because it would be a quite utterly absurd mutual oversight :)

Roger's suggested explanation is also extremely plausible.

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IM Jack Rudd
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Re: Why is this position evaluated so?

Postby IM Jack Rudd » Fri Jul 08, 2016 12:10 pm

An even more logical way to play the position would have been 22...Bxg2+ 23.Kg1 Nf3#. Where did this game come from?

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Fri Jul 08, 2016 8:01 pm

IM Jack Rudd wrote:An even more logical way to play the position would have been 22...Bxg2+ 23.Kg1 Nf3#. Where did this game come from?

:lol:
Over the internet

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Mon Jul 11, 2016 3:38 pm

Deleted
Seems the answer is there in the book

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Mon Jul 11, 2016 5:52 pm

What advantage does Whitehave in:
[FEN "r4rk1/2qbbpnp/pp1p2pB/2pPp3/1PP1PP2/P1NN4/1R1Q2PP/5RK1 b - - 0 18"] [SetUp "1"] * ?

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Tue Jul 12, 2016 3:38 am

What kinnd of comment is this one:
"...his winning chances amount to approximately 70%, with a 30% drawing margin."
How to measure these?

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Matt Mackenzie
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Re: Why is this position evaluated so?

Postby Matt Mackenzie » Tue Jul 12, 2016 1:05 pm

In plain language, it basically means they should win it with best play - and need to make a significant error to mess it up.
"Set up your attacks so that when the fire is out, it isn't out!" (H N Pillsbury)

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Tue Jul 12, 2016 3:45 pm

No aswer to this??
soheil_hooshdaran wrote:What advantage does White have in:
[FEN "r4rk1/2qbbpnp/pp1p2pB/2pPp3/1PP1PP2/P1NN4/1R1Q2PP/5RK1 b - - 0 18"] [SetUp "1"] * ?

Barry Sandercock
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Re: Why is this position evaluated so?

Postby Barry Sandercock » Tue Jul 12, 2016 4:31 pm

Soheil Hooshdaran wrote:
No answer to this ??

Matt's answer is the best you will get, as it is correct.

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

Postby Roger de Coverly » Tue Jul 12, 2016 4:43 pm

soheil_hooshdaran wrote:What advantage does White have in:
[FEN "r4rk1/2qbbpnp/pp1p2pB/2pPp3/1PP1PP2/P1NN4/1R1Q2PP/5RK1 b - - 0 18"] [SetUp "1"] * ?


Space presumably, the position looking as if it had arisen from the Old Benoni. That said, Black's Bishop pair might one day become useful. It's White's game to lose as apart from playing .. f5 or .. b5, there's not so much that Black can do, other than to react to threats. If it's White to play, you look at making f5 work.Alternatively you look at the consequences of bxc5 and an invasion attempt on the Queen side.

soheil_hooshdaran
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Re: Why is this position evaluated so?

Postby soheil_hooshdaran » Sat Jul 23, 2016 1:50 pm

Here Chess Life just gives: 17...g6?! 18.Bh6! why?
[FEN "r2qrnk1/1bp2ppp/p2p1b2/1p6/1PnPP3/3Q1N1P/P1B2PP1/1RB1RNK1 b - - 0 17"] [SetUp "1"] *

MartinCarpenter
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Re: Why is this position evaluated so?

Postby MartinCarpenter » Sat Jul 23, 2016 2:23 pm

They didn't fancy giving any analysis :) Looks a very dense position to me!

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

Postby Roger de Coverly » Sat Jul 23, 2016 2:32 pm

soheil_hooshdaran wrote:Here Chess Life just gives: 17...g6?! 18.Bh6! why?
[FEN "r2qrnk1/1bp2ppp/p2p1b2/1p6/1PnPP3/3Q1N1P/P1B2PP1/1RB1RNK1 b - - 0 17"] [SetUp "1"] *


I've learned to my cost that if you trade dark square Bishops in that type of Spanish position, that combinations with Nf5 can be very dangerous. But you may had to to play 17. .. g6 to defend against the Nf1-g3-f5 idea. If possible play .. g6 when there's a Knight on d2. That way you can get the Bishop to g7 via f6 or f8 without allowing Bh6.


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