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2 space high pincer, keima: push and cut
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Author:  Jujube [ Wed Oct 25, 2017 5:19 pm ]
Post subject:  2 space high pincer, keima: push and cut
What's the refutation to this sequence? I'm interested why, in this variation, stretching once and jumping instead of twice is the proper way.

Attachment:
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Author:  EdLee [ Wed Oct 25, 2017 6:04 pm ]
Post subject: 
Hi Jujube,

Quick search: the extend again (to R14, instead of R13 jump) is not unheard of:
about 25% (37 out of 144 pro games) with this local shape.

But the immediate :w1: 3rd line push is rare (less than 1%).
Author:  ez4u [ Wed Oct 25, 2017 6:42 pm ]
Post subject:  Re: 2 space high pincer, keima: push and cut
Black just captures the cutting stone and White will lose the fight in the corner.
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . 0 . . |
$$ | . . . . . . . . . . . . . . . 9 8 7 . |
$$ | . . . . . . . . . . . . . . O . 5 6 . |
$$ | . . . , . . . . . , . X . . . , X 4 . |
$$ | . . . . . . . . . . . . . . . O X 2 . |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . . X O 3 |
$$ | . . . . . . . . . . . . . . . . . 1 . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Black connects at 4 below and is ahead 4 liberties to 3.
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . 3 5 1 . |
$$ | . . . . . . . . . . . . . . . X 4 X . |
$$ | . . . . . . . . . . . . . . O 2 X O . |
$$ | . . . , . . . . . , . X . . . 6 X O . |
$$ | . . . . . . . . . . . . . . . O X O . |
$$ | . . . . . . . . . . . . . . . O O X . |
$$ | . . . . . . . . . . . . . . . . X . X |
$$ | . . . . . . . . . . . . . . . . . X . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Author:  EdLee [ Thu Oct 26, 2017 12:00 am ]
Post subject: 
Hi Dave, Thanks.
Author:  Uberdude [ Thu Oct 26, 2017 12:08 am ]
Post subject:  Re: 2 space high pincer, keima: push and cut
Jujube wrote:
What's the refutation to this sequence? I'm interested why, in this variation, stretching once and jumping instead of twice is the proper way.

I wouldn't say things as strongly as 'refutation' or 'proper': like ez4u showed black can capture both stones, but white might atari on top qnd/or use the 3-3 attachment to make shape and then keep fighting on the outside now the group is stronger. To make white's tesuji at 3-3 easier to resist black can push an extra time before jumping, but the downside is you push from behind and make white stronger. Both are plausible, depending on surroundings.
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