Here white can still invade at 'a' later. I won't repeat an explanation because Logan already explained it well recently in this thread: viewtopic.php?p=68958#p68958
If black plays 'b' as you suggested white also has a number of ways to invade, as Herman has pointed out.
- Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 2 . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . O . . . 5 b , . . . . . X O . . |
$$ | . . 4 . . 1 . . . a . X . O X X O . . |
$$ | . . . 3 . . . . . . . . . . X O O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
For that reason black will also consider playing like this:
- Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 2 . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . O . . . a . , . . . . . X O . . |
$$ | . . 4 . . 1 . . 5 . . X . O X X O . . |
$$ | . . . 3 . . . . . . . . . . X O O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
White can play moves like 'a' (above) to reduce black's position later, so there's no reason to be jealous.
There are openings where white even sets out to make black create this sort of position and cause uncertainty. Now black isn't sure about how to play 7 - 'a' or 'b'?. (if black plays 'b' white might play 'c' next.
- Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 2 . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . b . , . . . . . X . . . |
$$ | . . 6 . . 1 . . a . . 5 . 4 . . c . . |
$$ | . . . 3 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
So in other words, this opening is fine for white.
Regarding Chew Terr's question:
- Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . 4 . . . . . . . . . X . . . |
$$ | . . . O . 2 3 . . . . . . . . X O . . |
$$ | . . . 6 5 1 a . . . . B . O X X O . . |
$$ | . . . . . . . . . . . . . . X O O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
If this is the plan, black 4 could be at 'a' (above) (a sacrificing tactic to make black even more over concentrated on the bottom).
- Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . O . 2 3 . . . . . . . . X O . . |
$$ | . . . 6 . 1 4 7 . . . B . O X X O . . |
$$ | . . . . 5 . 8 9 . . . . . . X O O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
- Click Here To Show Diagram Code
[go]$$Wc
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . b . . . . . . . . . . . . . O . . |
$$ | . . . . . . 1 . . . . . . . . X . . . |
$$ | . . . O 5 O X 2 . . . . . . . X O . . |
$$ | . . . O 4 X O X a . . B . O X X O . . |
$$ | . . 7 6 X 3 O X . . . . . . X O O . . |
$$ | . . . . . . 8 . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
The reason why white might prefer not to do this here is because of the potential invasion later (after white just played 'b'). And if black chooses not to allow the invasion with the low move (at 'a' in the earlier diagrams) black is still slightly over-concentrated.
If the rest of the board supports it, this sacrifice could be a great opening strategy. Just try not to use over-concentration strategies too often/enthusiastically because sometimes you're erasing a future invasion, which helps the opponent's difficult position improve slightly.
I still prefer this result for white though, it just takes some of the subtlety out of the position by settling everything locally.
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a good idea to start with?)
at a which was stoopid methink i guess b was the move ?
stone in this diagram, your first thought here should be: Do not pincer! Pincering here allows black to use his strength.
in your second diagram is a mistake, it should be one to the left. It introduces weaknesses, and Black wants to stay as far away as possible from his strong lower right.
is hard to handle
is a mistake, and white got away with it. Black should split:
has become a huge burden within just a few moves
