Why did he did so?

Technical questions regarding Openings, Middlegames, Endings etc.
soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Sat Apr 08, 2017 9:08 am

What does and 'eventual ...f5-f4 advance mean?
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IM Jack Rudd
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Re: Why did he did so?

Post by IM Jack Rudd » Sat Apr 08, 2017 9:11 am

It means that black will play f5-f4 at some (unspecified, and implied to be distant) point in the future.
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Roger de Coverly
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Re: Why did he did so?

Post by Roger de Coverly » Sat Apr 08, 2017 9:16 am

soheil_hooshdaran wrote:He gave Nxc5 without any comment
If it's a "How to play the Hedgehog" book, taking with either pawn changes the structure so it's no longer one.
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soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Sat Apr 08, 2017 10:44 am

No, a strategy book
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soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Sat Apr 08, 2017 7:15 pm

IM Jack Rudd wrote:It means that black will play f5-f4 at some (unspecified, and implied to be distant) point in the future.
So not necessarily at the end?
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soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Tue Apr 25, 2017 9:38 pm

What's the basis for the combination?

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soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Thu Apr 27, 2017 12:52 pm

What gave rise to this combination?

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Roger de Coverly
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Re: Why did he did so?

Post by Roger de Coverly » Thu Apr 27, 2017 1:01 pm

soheil_hooshdaran wrote:What gave rise to this combination?
There are several elements needed to make it work, but an underlying point is the Queen sacrifice on a7, followed by a mate with the two Rooks. The initial tactical weakness of the King on b8 and Queen on f6 contributes as they are vulnerable to the Nd7 fork.
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soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Thu May 18, 2017 2:58 pm

Hi
What's this combination based on?

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IM Jack Rudd
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Re: Why did he did so?

Post by IM Jack Rudd » Thu May 18, 2017 3:07 pm

It's based on white's pieces being badly placed to defend the king. One key line is 3.fxe4 Qg4+ 4.Kh1 Qf3+ 5.Kg1 Bh3 and there's no way to prevent mate on g2.
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soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Thu May 18, 2017 3:15 pm

Oh, so obtaining temporary material advantage, right?
Many thanks!
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soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Thu May 18, 2017 3:41 pm

What's this combination based on?

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Matt Mackenzie
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Re: Why did he did so?

Post by Matt Mackenzie » Thu May 18, 2017 6:07 pm

Its a way of forcing a perpetual in an otherwise bad position, surely?
"Set up your attacks so that when the fire is out, it isn't out!" (H N Pillsbury)
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Roger de Coverly
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Re: Why did he did so?

Post by Roger de Coverly » Thu May 18, 2017 6:20 pm

soheil_hooshdaran wrote:What's this combination based on?
The Bishop on b1 is hanging, so has to move. The only other square is c2, after which .. Ra2 looks very strong.

The drawing combination uses the power of what in English are sometimes known as Harrwitz bishops.

https://en.wikipedia.org/wiki/Glossary_ ... tz_bishops
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Barry Sandercock
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Re: Why did he did so?

Post by Barry Sandercock » Thu May 18, 2017 7:02 pm

2..Bg7 would have stopped White's perpetual check.
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