Life In 19x19

Hello,

would appreciate any advice on setting up and handling a double wing extension.

My recent spectacular failure attached. Esp grateful for comments regarding the invasion around move 30. No need to look after move 85-90, started to play a bit on 'tilt' after dropping the stones on the right side.

Thanks in advance.

EDIT: Looking at the game again, (or ) should probably have been played at G14 instead?

Hi Tapani,

Did you also consider to get out, say, F4 ?

Feels slow. Did you consider the top right corner ?

Did you consider the hane M16 ?

What happens if B J17 hane ?

Did you consider the L16 wedge ?

- Bad exchange for W. You fixed B's weakness here;
you forced B to make good shape.

Did you consider J14 ? ( aiming at o16 )

Well.

A few comments.

Just protect the corner with D-02. Now if Black makes a base on the left side, take the last big play of the opening on the top side. A pincer just asks for trouble. Black let you off the hook, though.

Too deep. The keima on the frontier of moyos (J-14) looks good.

Hane is a must. Sacrifice the stone if you can.

Black lets you off the hook, again.

Yes!

Just hane at C-09.

Now hane at C-11.

Keep Black separated. F-15, perhaps.

Not so good, as Ed says.

E-14 threatens two cuts.

Thank you Ed and Bill for the comments.

The good news is that I *did* consider most of the moves you suggest. The bad thing is that I decided against them... which suggests that there might be something flawed in my positional / tactical judgment.

Just not to divert too much, I'll take two examples:

@Ed:

About the "slow" . Invading top right corner was the other option. Thought if I do, black will chose a joseki that builds a wall vertically and gives him sente (at the cost of a few points in the corner), then that sente move can be used to further his grip on the whole top side of the board.

So my at H16 was intended as claiming some territory, setting up the double wing and preparing to invade top right.

What is wrong with that reasoning? (Note: I am not arguing there is nothing wrong with my thinking, just trying to find out where I think wrong and why)

@Bill:
About , the other move I considered were indeed D2 (or maybe D3). Decided against them because of something like this:

Click Here To Show Diagram Code

[go]$$W
$$ | . . . . . . . . .
$$ | . . X . . . . . .
$$ | . . . . . . . . .
$$ | . 5 O . . . . . .
$$ | . 4 6 7 . . . . .
$$ | . . . O . . . . X
$$ | . . 2 3 . X . . .
$$ | . . 8 1 . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

and whites stones look in danger to me (no eyes!). Objectively they might be ok, but when I am on the run for my life, that ends up too often with me getting a 20+ stone group captured. So I *really* try to avoid being on the run.
The pincer was partially to weaken the C8 stone and give my stones in the corner some assistance if the line above happens.

Maybe there is a better way to deal with that 3-3 invasion, but I tend to lose corners to opponents tossing in stones like that. (See how I lost the whole top left corner move :b255: the game).


Same reasoning about being on the run applies to Ed's suggestion about to be played at F4 (actually F5 was what I considered, but same idea). Thought I end up running - allowing black to harass me, and securing a lot of points in the process - best case. In the worst case my opponents also catches the group and wins the game right there.

Is this the wrong way of thinking? It was a rapid online game, so there is no time to read more than 2-3 moves.

Hi Tapani,

Notice Bill didn't comment on it. ( Not game-deciding, either way. )

Some local considerations:

Click Here To Show Diagram Code

[go]$$W
$$ | . . . . . . . . .
$$ | . . X . . . . . .
$$ | . . . . . . . . .
$$ | . 5 O . . . . . .
$$ | . 4 6 7 . . . . .
$$ | . . . O . . . . X
$$ | . . 2 3 . X . . .
$$ | . . 8 1 . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

If you're unsure about the above life-and-death, you can consider blocking on top:

Click Here To Show Diagram Code

[go]$$W
$$ | . . . . . . . . .
$$ | . . X . . . . . .
$$ | . 7 9 . . . . . .
$$ | . 6 O . . . . . .
$$ | . 4 5 . . . . . .
$$ | . . 8 O . . . . X
$$ | . . 2 3 . X . . .
$$ | . . . 1 . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

whites stones look in danger to me (no eyes!).

It's the opposite:
Continuing from your var, connect is sente -- it is Blk who is not alive:

Click Here To Show Diagram Code

[go]$$W
$$ | . . . . . . . . .
$$ | . . X . . . . . .
$$ | . . . . . . . . .
$$ | . 5 O 9 . . . . .
$$ | . 4 6 7 . . . . .
$$ | . . . O . . . . X
$$ | . . 2 3 . X . . .
$$ | . . 8 1 . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

I tend to lose corners...
(See how I lost the whole top left corner move 255 the game).

Good observation. Potential remedies:

• Denial. Ignoring, avoiding, or scared of the corner, etc.
• Face the difficulty head on ( what were the mistakes leading to 255 ? )
• Other. ( )

EdLee wrote:Continuing from your var, connect is sente -- it is Blk who is not alive:

$$W
$$ | . . . . . . . . .
$$ | . . X . . . . . .
$$ | . . . . . . . . .
$$ | . 5 O 9 . . . . .
$$ | . 4 6 7 . . . . .
$$ | . . . O . . . . X
$$ | . . 2 3 . X . . .
$$ | . . 8 1 . . . . .
$$ | . . . . . . . . .
$$ ------------------

Click Here To Show Diagram Code

[go]$$W
$$ | . . . . . . . . .
$$ | . . X . . . . . .
$$ | . . . . . . . . .
$$ | . 5 O 9 . . . . .
$$ | . 4 6 7 . . . . .
$$ | . . . O . . . . X
$$ | . . 2 3 . X . . .
$$ | . . 8 1 . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Click Here To Show Diagram Code

[go]$$W
$$ | . . . . . . . . .
$$ | . . X . . . . . .
$$ | . . . . . . . . .
$$ | . 5 O 9 . . . . .
$$ | . 4 6 7 . . . . .
$$ | . . 0 O . . . . X
$$ | . . 2 3 . X . . .
$$ | . . 8 1 . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Well, leaves a well known 10,000 year ko position. See http://senseis.xmp.net/?LongLGroup . You knew that, OC.