Life In 19x19 :: Narrow win

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Author:

Amelia [ Sun Apr 14, 2013 12:30 pm ]

Post subject:

Narrow win

Hello everyone,

I won that game by half a point after grinding quite a number of points in yose, mostly thanks to mistakes of my opponent.

The middle game was dreadful, though. Mostly I think I messed up responding to the invasion on the bottom and the approach on the left side. About the left side, I'm pretty sure I know what I did wrong (move 18), but I'm a bit at a loss with the bottom invasion (starting with move 57). Could I have got a better result? Or did it go so wrong because my group on the bottom left was too weak?

Thanks in advance for any advice.

Attachments:

Soji-Onew.sgf [5.15 KiB]
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Author:	Toge [ Sun Apr 14, 2013 1:55 pm ]
Post subject:	Re: Narrow win
I added some comments and variations.

Author:	Amelia [ Sun Apr 14, 2013 2:15 pm ]
Post subject:	Re: Narrow win
As usual, my mistakes aren't really where I thought they would. Thanks a lot for looking at the game !

Author: Bill Spight [ Sun Apr 14, 2013 3:57 pm ]

Post subject: Re: Narrow win

Here is a standard tesuji that is worth learning.

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . | $$ . . . . O . . | $$ . . . . . O 3 | $$ . . . . O X O | $$ . . O . O X 7 | $$ . . . O X 5 X | $$ . O . O X 6 4 | $$ . . O X X 2 1 | $$ . . O . . . 8 | $$ --------------[/go]

Variation if Black wants to take sente.

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . | $$ . . . . O . . | $$ . . . . . O 3 | $$ . . . . O X O | $$ . . O . O X 7 | $$ . . . O X 5 X | $$ . O . O X . 4 | $$ . . O X X 2 1 | $$ . . O . . . 6 | $$ --------------[/go]

Author: Amelia [ Mon Apr 15, 2013 2:24 am ]

Post subject: Re: Narrow win

Toge, this is the vital point, isn't it?

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . | $$ . . . . . . . | $$ . . . . O O O | $$ . . . . O X O | $$ . . . O O X O | $$ . . . O X X X | $$ . . O O X . . | $$ . . O X X a . | $$ . . O X . . . | $$ --------------[/go]

If I play there first:

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . | $$ . . . . . . . | $$ . . . . O O O | $$ . . . . O X O | $$ . . . O O X O | $$ . . . O X X X | $$ . . O O X . 3 | $$ . . O X X 1 . | $$ . . O X . 2 . | $$ --------------[/go]

And this:

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . | $$ . . . . . . . | $$ . . . . O O O | $$ . . . . O X O | $$ . . . O O X O | $$ . . . O X X X | $$ . . O O X 4 . | $$ . . O X X 3 2 | $$ . . O X . 1 . | $$ --------------[/go]

Am I correct?

Bill, thank you for the tesuji. I'll learn it, this shape comes up so often in my games.

Author:	Toge [ Mon Apr 15, 2013 5:44 am ]
Post subject:	Re: Narrow win
You found it Amelia. In the second diagram black can turn the position into ko by throwing in at T2 and white can turn it into ko by playing T1. The ko is risky for black, but if the game is close, opting to choose seki here can be enough. In the second diagram black must play T1 to prevent ko. If white wants to just get seki, then playing move 3 at T2 makes that happen.

Author: Bill Spight [ Mon Apr 15, 2013 7:19 am ]

Post subject: Re: Narrow win

Amelia wrote:

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . | $$ . . . . . . . | $$ . . . . O O O | $$ . . . . O X O | $$ . . . O O X O | $$ . . . O X X X | $$ . . O O X . 3 | $$ . . O X X 1 . | $$ . . O X . 2 . | $$ --------------[/go]

And this:

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . | $$ . . . . . . . | $$ . . . . O O O | $$ . . . . O X O | $$ . . . O O X O | $$ . . . O X X X | $$ . . O O X 4 . | $$ . . O X X 3 2 | $$ . . O X . 1 . | $$ --------------[/go]

Am I correct?

Click Here To Show Diagram Code: [go]$$W Typical $$ . . . . . . . | $$ . . . . . . . | $$ . . . . O O O | $$ . . . . O X O | $$ . . . O O X O | $$ . . . O X X X | $$ . . O O X . . | $$ . . O X X 1 3 | $$ . . O X . 2 . | $$ --------------[/go]

This sequence would be usual with White playing first.

Click Here To Show Diagram Code: [go]$$W Seki $$ . . . . . . . | $$ . . . . . . . | $$ . . . . O O O | $$ . . . . O X O | $$ . . . O O X O | $$ . . . O X X X | $$ . . O O X 4 . | $$ . . O X X 1 3 | $$ . . O X . 2 . | $$ --------------[/go]

can make seki.

Click Here To Show Diagram Code: [go]$$W 10,000 year ko $$ . . . . . . . | $$ . . . . . . . | $$ . . . . O O O | $$ . . . . O X O | $$ . . . O O X O | $$ . . . O X X X | $$ . . O O X . . | $$ . . O X X O O | $$ . . O X . X 1 | $$ --------------[/go]

If Black plays elsewhere, :w1:

can make a 10,000 year ko. (The name implies that the ko is never converted into a direct ko for the corner. But normally White should convert the ko or threaten to do so. It all depends on the rest of the board, of course.

)

Click Here To Show Diagram Code: [go]$$W Black lives $$ . . . . . . . | $$ . . . . . . . | $$ . . . . O O O | $$ . . . . O X O | $$ . . . O O X O | $$ . . . O X X X | $$ . . O O X . 4 | $$ . . O X X 2 3 | $$ . . O X . 1 . | $$ --------------[/go]

is a mistake. :b2:

lives. If

preserves two eyes.

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