2 space high pincer, keima: push and cut

Jujube · Post by **Jujube** » Wed Oct 25, 2017 5:19 pm

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.

: Capture.PNG (8.13 KiB) Viewed 5382 times

EdLee · Post by **EdLee** » Wed Oct 25, 2017 6:04 pm

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

3rd line push is rare (less than 1%).

ez4u · Post by **ez4u** » Wed Oct 25, 2017 6:42 pm

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 · Post by **EdLee** » Thu Oct 26, 2017 12:00 am

Hi Dave, Thanks.

Uberdude · Post by **Uberdude** » Thu Oct 26, 2017 12:08 am

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.

Life In 19x19

2 space high pincer, keima: push and cut

2 space high pincer, keima: push and cut

Re: 2 space high pincer, keima: push and cut

Re: 2 space high pincer, keima: push and cut