2 space high pincer, keima: push and cut

Jujube · #1

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.

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EdLee · #2

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%).

ez4u · #3

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 . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/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 . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

EdLee · #4

Hi Dave, Thanks.

Uberdude · #5

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.

2 space high pincer, keima: push and cut

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