Why did he did so?

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

Post by Roger de Coverly » Sat Dec 02, 2017 11:18 am

soheil_hooshdaran wrote:
Sat Dec 02, 2017 11:02 am
Would someone please explain to me the elements of this combination( theme, motif, etc)?
Aren't there several? There's deflection as the queen has no squares to move to which don't lose the Rook on d6. There's discovered check as in 2. Rxc4. There's also a winning pin after 1. .. Bxd5 2. Rd7. The last one isn't so easy to spot but you have to know it's there before playing Nd5.

Ian Thompson
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Re: Why did he did so?

Post by Ian Thompson » Sat Dec 02, 2017 12:30 pm

soheil_hooshdaran wrote:
Sat Dec 02, 2017 11:02 am
Would someone please explain to me the elements of this combination( theme, motif, etc)?
White's a piece up and needs to find a move that saves the rook on c7 and stops Black drawing by 1... Qd2+ 2.Kb2 Qb4+, as well as the observations made by Roger.

You've only given half the combination showing that Nd5 does leave White a piece up. The full sequence is:


soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Sat Dec 02, 2017 9:17 pm

Ian Thompson wrote:
Sat Dec 02, 2017 12:30 pm
soheil_hooshdaran wrote:
Sat Dec 02, 2017 11:02 am
Would someone please explain to me the elements of this combination( theme, motif, etc)?
White's a piece up and needs to find a move that saves the rook on c7 and stops Black drawing by 1... Qd2+ 2.Kb2 Qb4+, as well as the observations made by Roger.

You've only given half the combination showing that Nd5 does leave White a piece up. The full sequence
Well, that's as far as the solution goes, according to tactics.chessbase.com

soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Fri Dec 22, 2017 11:03 am

What was the point of this tactical exercise?

Roger de Coverly
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Re: Why did he did so?

Post by Roger de Coverly » Fri Dec 22, 2017 12:32 pm

soheil_hooshdaran wrote:
Fri Dec 22, 2017 11:03 am
What was the point of this tactical exercise?

The Queen and Bishop are both attacked, so to defend both the Queen has to go to h6,h5 or h4. On h4, there's also a threat of Qxf2, so h4 would appear the best square. That's very superficial analysis, but it's enough to choose Qh4 with little time used.

soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Sat Dec 23, 2017 6:04 am

What would happen if Kg2?

Matt Fletcher
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Re: Why did he did so?

Post by Matt Fletcher » Sat Dec 23, 2017 7:00 am

soheil_hooshdaran wrote:
Sat Dec 23, 2017 6:04 am
What would happen if Kg2?
Unlike the alternatives, Qh4 defends the d8 square. So I think you play 2...Re6 after 2.Kg2 - and there's no need to worry about Qd8+.

soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Wed Dec 27, 2017 7:12 pm

How would you find the first move in:

Roger de Coverly
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Re: Why did he did so?

Post by Roger de Coverly » Wed Dec 27, 2017 8:18 pm

soheil_hooshdaran wrote:
Wed Dec 27, 2017 7:12 pm
How would you find the first move in:
I suppose you have to spot the potential mate on c1 and use it to put the sequence of moves together. Some players are just better at that sort of thing than others. It helps if you are able to play the rest of the game in a style that creates these opportunities.

It's a nice deflection sacrifice and you have to see that Qxh6 can be met by Bxd2.

soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Fri Jan 05, 2018 5:28 pm

What is the motif for this Sac?

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IM Jack Rudd
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Re: Why did he did so?

Post by IM Jack Rudd » Fri Jan 05, 2018 6:41 pm

Removal of defender. The e4 square is a very important one for black's knight.

soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Wed Mar 14, 2018 5:21 am

IM Jack Rudd wrote:
Fri Jan 05, 2018 6:41 pm
Removal of defender. The e4 square is a very important one for black's knight.
But he is giving up an exchange!

soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Wed Mar 14, 2018 5:21 am

W@hy is ...b6 bad here?

soheil_hooshdaran
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Re: Why did he did so?

Post by soheil_hooshdaran » Wed Mar 14, 2018 5:32 am

Why would White have an excellent game after d5?

Roger de Coverly
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Re: Why did he did so?

Post by Roger de Coverly » Wed Mar 14, 2018 10:03 am

soheil_hooshdaran wrote:
Wed Mar 14, 2018 5:21 am
Why is ...b6 bad here?
It's Botvinnik v Kan from 1930.

According to an engine, Kan got a bad game not with .. b6, but by following it up with .. d6 .

It's more that the resulting structure where White has played d5, Black responds with .. e5 isn't very good.



Instead you can keep the pawn back at d7 and get positions like this.

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