Life In 19x19

Posted: **Mon Nov 04, 2019 5:25 pm**

I used to play 3 of the 4 most popular pro choices in this shape in my games, but the runner-up got overlooked by me up until now.

White to play:

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

Posted: **Mon Nov 04, 2019 5:43 pm**

I think it is quite easy to spot it in this game due to the location of the shape on the board. (But the move is also a good candidate move in many other less obvious positions.)

Black to play:

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

Kobayashi Koichi, 9d - O Meien, 9d, B+5.5 (Komi 6.5)
37th Tengen, Final Preliminary, Group Final, 2010-11-11

Posted: **Mon Nov 04, 2019 7:08 pm**

Gomoto wrote:
I think it is quite easy to spot it in this game due to the location of the shape on the board. (But the move is also a good candidate move in many other less obvious positions.)

Black to play:

$$B
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . O X . X . . O . . . X . . . . . . |
$$ | . O X , X . . . . , . . . . . X . . . |
$$ | . . O X . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . . O X . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . O . . . |
$$ | . . . . . . . . O . . . . . O X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . X . O X X . . . . O . . . |
$$ | . . X X . . X O O O O X X . X , O . . |
$$ | . X O O . X O X X X O . . . X O . . . |
$$ | . O . . . O O . X O X X . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------
Click Here To Show Diagram Code
[go]$$B $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . . . . . . . . . . . | $$ | . . O X . X . . O . . . X . . . . . . | $$ | . O X , X . . . . , . . . . . X . . . | $$ | . . O X . . . . . . . . . . . . . . . | $$ | . . O O . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . O . . . . . . . . . . . . . . . | $$ | . . . O X . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . . . . . . . O . . . | $$ | . . . . . . . . O . . . . . O X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . X . O X X . . . . O . . . | $$ | . . X X . . X O O O O X X . X , O . . | $$ | . X O O . X O X X X O . . . X O . . . | $$ | . O . . . O O . X O X X . . . O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]
Kobayashi Koichi, 9d - O Meien, 9d, B+5.5 (Komi 6.5)
37th Tengen, Final Preliminary, Group Final, 2010-11-11

Click Here To Show Diagram Code: [go]$$Bcm59 Checking extension/pincer $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . . . . . . . . . . . | $$ | . . O X . X . . O . 1 . X . . . . . . | $$ | . O X , X . . . . , . . . . . X . . . | $$ | . . O X . . . . . . . . . . . . . . . | $$ | . . O O . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . O . . . . . . . . . . . . . . . | $$ | . . . O X . . . . , . . . . . , . . . | $$ | . . . a . . . . . . . . . . . . . . . | $$ | . . . X . . . . . . . . . . . O . . . | $$ | . . . . . . . . O . . . . . O X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . X . O X X . . . . O . . . | $$ | . . X X . . X O O O O X X . X , O . . | $$ | . X O O . X O X X X O . . . X O . . . | $$ | . O . . . O O . X O X X . . . O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

In its commentary Elf prefers

to a by 5%. Even though the ladder works.

Edit: However

Click Here To Show Diagram Code: [go]$$Bcm59 Elf's mainline variation $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . . . . . . . . . . . | $$ | . . O X . X . . O . 1 . X . . . . . . | $$ | . O X , X . . . . , . . . . . X . . . | $$ | . . O X . . . . 4 . . . . . . . . . . | $$ | . . O O . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . O . . . . . . . . . . . . . . . | $$ | . . . O X . . . . , . . . . . , 3 . . | $$ | . . . 5 . . . . . . . . . . . . . . . | $$ | . . . X . . . . . . . . . . . O . . . | $$ | . . . . . . . . O . . . . . O X . . . | $$ | . . . . . . 2 . . . . . . . . . . . . | $$ | . . . . . . X . O X X . . . . O . . . | $$ | . . X X . . X O O O O X X . X , O . . | $$ | . X O O . X O X X X O . . . X O . . . | $$ | . O . . . O O . X O X X . . . O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Elf has Black play there later, even when the ladder does not work.

Posted: **Wed Nov 06, 2019 12:24 am**

Gomoto wrote:I used to play 3 of the 4 most popular pro choices in this shape in my games, but the runner-up got overlooked by me up until now.

Sorry, only three moves pop into my mind, including the one you're overlooking. So which move am I overlooking?

Posted: **Wed Nov 06, 2019 12:26 am**

Life In 19x19

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