Life In 19x19

Posted: **Wed Jan 02, 2013 10:54 am**

This problem took me two weeks to solve when I was young. So I'll post the answer in about a fortnight's time. Black to play and kill

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

Posted: **Wed Jan 02, 2013 11:13 am**

Cool problem.
my attempt:

Posted: **Wed Jan 02, 2013 11:18 am**

edit: but now i think i am wrong on my first move

Posted: **Wed Jan 02, 2013 11:37 am**

after some thought white die no ko..
did i miss anything?

Posted: **Wed Jan 02, 2013 11:47 am**

Magicwand wrote:after some thought white die no ko..
did i miss anything?
$$Bc
$$------------
$$|.2O.1.X....
$$|O4.5O.X....
$$|.3O...X....
$$|......X....
$$|XXXXXXX....
$$|...........

Click Here To Show Diagram Code
[go]$$Bc $$------------ $$|.2O.1.X.... $$|O4.5O.X.... $$|.3O...X.... $$|......X.... $$|XXXXXXX.... $$|...........[/go]

$$Bc
$$------------
$$|.3O21.X....
$$|O4.5O.X....
$$|..O...X....
$$|......X....
$$|XXXXXXX....
$$|...........

Click Here To Show Diagram Code
[go]$$Bc $$------------ $$|.3O21.X.... $$|O4.5O.X.... $$|..O...X.... $$|......X.... $$|XXXXXXX.... $$|...........[/go]

$$Bc
$$------------
$$|.4O.1.X....
$$|O..5O.X....
$$|..O...X....
$$|32....X....
$$|XXXXXXX....
$$|...........

Click Here To Show Diagram Code
[go]$$Bc $$------------ $$|.4O.1.X.... $$|O..5O.X.... $$|..O...X.... $$|32....X.... $$|XXXXXXX.... $$|...........[/go]

Posted: **Thu Jan 03, 2013 7:15 am**

i spend 30 min and can not find answer to this problem.

Posted: **Thu Jan 03, 2013 8:05 am**

Posted: **Thu Jan 03, 2013 8:09 am**

Posted: **Thu Jan 03, 2013 8:19 am**

Posted: **Thu Jan 03, 2013 8:20 am**

Alguien wrote:
$$Bc
$$----------------------
$$|. . O . X . X . . . .
$$|O . . . O . X . . . .
$$|. 4 O . O . X . . . .
$$|. . X . . . X . . . .
$$|X X X X X X X . . . .
$$|. . . . . . . . . . .

Click Here To Show Diagram Code
[go]$$Bc $$---------------------- $$|. . O . X . X . . . . $$|O . . . O . X . . . . $$|. 4 O . O . X . . . . $$|. . X . . . X . . . . $$|X X X X X X X . . . . $$|. . . . . . . . . . .[/go]

I don't get it. Seems alive to me. I'm much too weak for this problem, though.

Posted: **Thu Jan 03, 2013 8:20 am**

Ninja'd

Posted: **Sun Jan 27, 2013 4:32 pm**

The correct solution has been posted - well done!

Posted: **Mon Jan 28, 2013 8:53 am**

Let us honour the book "Juseki Burou - Go Seigen Tsumego-shuu by Go Seigen", published by Seibundou Shinkousha, 1995 (ISBN 4-416-79510-6 C0076) for this problem and (in my case) GoGoD, where I took all the details ^^

It's a class A problem and also has a name: "THE SOUTHERN CROSS STAR - Breaking into a solid encampment".

Quite similiar to his Tesuji dictionaries Go Seigen's Tsumego-book has three categories of problems A, B and C. A are of course the hardest.

Posted: **Thu Jan 31, 2013 4:57 pm**

That's interesting - I actually learned this problem from Shutai Zhang, who was British Go Champion for a number of years. He studied to be professional when he was young, and this was one of the problems he encountered in his training. (I think it was also in the British Go Journal in the early 1990s.)

Life In 19x19

Difficult tsume go.

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