tsumego-question // How to kill the corner?

Gegenzeit · Post by **Gegenzeit** » Mon Jul 23, 2012 6:26 am

Hi,

I'm currently studying the Tesuji book by James Davids. This is a tsuemgo to practise the double hane tesuji. This is the solution given:

The important part is that white 10 is necessary in order to bring alive the corner - this allows black to catch white in a loose ladder. That is ok with me. BUT: What if white did defend differently at 6. This is what I mean:

If white runs out instead of defending the corner, I can't kill it. What do I miss?

Thanks

Jörg

emeraldemon · Post by **emeraldemon** » Mon Jul 23, 2012 7:41 am

Click Here To Show Diagram Code: [go]$$Bcm1 Ko? $$ -------------------- $$ | . 5 2 . . O . . . . $$ | 3 O 1 4 . O X X . . $$ | . X O O O X O X . . $$ | . X X X X X O . . , $$ | . . . . . . O . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . . , . . . . . ,[/go]

Tooveli · Post by **Tooveli** » Mon Jul 23, 2012 8:16 am

Ko is correct but there is a better ko for Black.

topazg · Post by **topazg** » Mon Jul 23, 2012 8:39 am

Gegenzeit · Post by **Gegenzeit** » Tue Jul 24, 2012 2:18 am

Thanks for all the answers. So black needs to be willing to fight a Ko when playing the double hane in this position.

topazg · Post by **topazg** » Tue Jul 24, 2012 2:36 am

Gegenzeit wrote:Thanks for all the answers. So black needs to be willing to fight a Ko when playing the double hane in this position.

I think for Black that's a nobrainer. At the beginning White has a group, Black has a wall. At the end, Black has an even thicker group, White has a potentially weak center group and a corner that's only alive in ko - it's a huge positive change! The corner is a good 20 points, so White's more likely to play the living move anyway, as it's a very painful ko to leave, and in which case, Black's thickness is outstanding. Either way, the double hane gives a good outcome for Black.

Gegenzeit · Post by **Gegenzeit** » Tue Jul 24, 2012 2:47 am

Ok, thanks again. That explanation was really helpful!

Dusk Eagle · Post by **Dusk Eagle** » Tue Jul 24, 2012 2:50 am

This is what's called a flower-viewing ko for black - if black loses the ko, he doesn't lose much, but if white loses the ko, it's a major loss. Black should be happy to start the ko if white actually allows him to do so.

kvasir · Post by **kvasir** » Sat Jul 28, 2012 12:57 am

But

kills for sure. No?

Click Here To Show Diagram Code: [go]$$Bcm1 $$ -------------------- $$ | . 4 3 1 5 O 7 . . . $$ | 6 O . 2 . O X X . . $$ | . X O O O X O X . . $$ | . X X X X X O . . , $$ | . . . . . . O . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . . , . . . . . ,[/go]

Bill Spight · Post by **Bill Spight** » Sat Jul 28, 2012 1:36 am

Click Here To Show Diagram Code: [go]$$Bcm1 $$ -------------------- $$ | 8 7 3 1 6 O . . . . $$ | 5 O 4 2 . O X X . . $$ | . X O O O X O X . . $$ | . X X X X X O . . , $$ | . . . . . . O . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . .[/go]

@ 7,

@ 3

Click Here To Show Diagram Code: [go]$$Bcm1 $$ -------------------- $$ | . 6 3 1 8 O 5 . . . $$ | 7 O 4 2 . O X X . . $$ | . X O O O X O X . . $$ | . X X X X X O . . , $$ | . . . . . . O . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . .[/go]

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tsumego-question // How to kill the corner?

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Re: tsumego-question // How to kill the corner?