Life In 19x19 :: Difficult tsume go.

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Difficult tsume go. http://www.lifein19x19.com/viewtopic.php?f=15&t=7548	Page 1 of 1

Author:	drmwc [ Wed Jan 02, 2013 10:54 am ]
Post subject:	Difficult tsume go.
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 no ko . Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|..O...X.... $$\|O...O.X.... $$\|..O...X.... $$\|......X.... $$\|XXXXXXX.... $$\|...........[/go]`

Author:	speedchase [ Wed Jan 02, 2013 11:13 am ]
Post subject:	Re: Difficult tsume go.
Cool problem. my attempt: Click Here To Show Diagram Code `[go]$$Bc $$- - - - - - - - - - - - $$\| . . O . . . X . . . . $$\| O 1 . . O . X . . . . $$\| . . O . . . X . . . . $$\| . . . . . . X . . . . $$\| X X X X X X X . . . . $$\| . . . . . . . . . . .[/go]` I don't see a way for white to live after Click Here To Show Diagram Code `[go]$$Bc $$- - - - - - - - - - - - $$\| . 2 O . . . X . . . . $$\| O 1 . . O . X . . . . $$\| 5 3 O . . . X . . . . $$\| a 4 b . . . X . . . . $$\| X X X X X X X . . . . $$\| . . . . . . . . . . .[/go]` If white starts like this, Black can connect out. Click Here To Show Diagram Code `[go]$$Bc $$- - - - - - - - - - - - $$\| . 3 O 6 5 8 X . . . . $$\| O 1 4 . O . X . . . . $$\| . 2 O 9 7 . X . . . . $$\| . . . . . . X . . . . $$\| X X X X X X X . . . . $$\| . . . . . . . . . . .[/go]` If white kills black's stones this way, then black can prevent the second eye. Click Here To Show Diagram Code `[go]$$Bc $$- - - - - - - - - - - - $$\| . 3 O 7 4 . X . . . . $$\| O 1 5 6 O . X . . . . $$\| . 2 O . . . X . . . . $$\| . . . . . . X . . . . $$\| X X X X X X X . . . . $$\| . . . . . . . . . . .[/go]` gosh darnit, ko, back to the drawing board

Author:	Magicwand [ Wed Jan 02, 2013 11:18 am ]
Post subject:	Re: Difficult tsume go.
i think this might be the only choice for first move.. Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|..O.1.X.... $$\|O...O.X.... $$\|..O...X.... $$\|......X.... $$\|XXXXXXX.... $$\|...........[/go]` edit: but now i think i am wrong on my first move

Author:	Magicwand [ Wed Jan 02, 2013 11:37 am ]
Post subject:	Re: Difficult tsume go.
after some thought white die no ko.. did i miss anything? Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|.2O.1.X.... $$\|O4.5O.X.... $$\|.3O...X.... $$\|......X.... $$\|XXXXXXX.... $$\|...........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|.3O21.X.... $$\|O4.5O.X.... $$\|..O...X.... $$\|......X.... $$\|XXXXXXX.... $$\|...........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|.4O.1.X.... $$\|O..5O.X.... $$\|..O...X.... $$\|32....X.... $$\|XXXXXXX.... $$\|...........[/go]`

Author:	Prodigious [ Wed Jan 02, 2013 11:47 am ]
Post subject:	Re: Difficult tsume go.
Magicwand wrote: after some thought white die no ko.. did i miss anything? Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|.2O.1.X.... $$\|O4.5O.X.... $$\|.3O...X.... $$\|......X.... $$\|XXXXXXX.... $$\|...........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|.3O21.X.... $$\|O4.5O.X.... $$\|..O...X.... $$\|......X.... $$\|XXXXXXX.... $$\|...........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|.4O.1.X.... $$\|O..5O.X.... $$\|..O...X.... $$\|32....X.... $$\|XXXXXXX.... $$\|...........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|..O.1.X.... $$\|O...O.X.... $$\|..O.2.X.... $$\|......X.... $$\|XXXXXXX.... $$\|...........[/go]` This one is worth looking at

Author:	Magicwand [ Thu Jan 03, 2013 7:15 am ]
Post subject:	Re: Difficult tsume go.
i spend 30 min and can not find answer to this problem.

Author:	logan [ Thu Jan 03, 2013 8:05 am ]
Post subject:	Re: Difficult tsume go.
Click Here To Show Diagram Code `[go]$$Bc $$---------------------- $$\|. . O . 1 . X . . . . $$\|O . . . O . X . . . . $$\|. . O . 2 . X . . . . $$\|. . 3 . . . X . . . . $$\|X X X X X X X . . . . $$\|. . . . . . . . . . .[/go]`

Author:	Alguien [ Thu Jan 03, 2013 8:09 am ]
Post subject:	Re: Difficult tsume go.
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.

Author:	Alguien [ Thu Jan 03, 2013 8:19 am ]
Post subject:	Re: Difficult tsume go.
I only see ko everywhere. Click Here To Show Diagram Code `[go]$$Bc $$- - - - - - - - - - - - $$\| . 1 . 3 . . X . . . . $$\| O 2 5 4 O . X . . . . $$\| . . O . . . X . . . . $$\| . . . . . . X . . . . $$\| X X X X X X X . . . . $$\| . . . . . . . . . . .[/go]`

Author:	Magicwand [ Thu Jan 03, 2013 8:20 am ]
Post subject:	Re: Difficult tsume go.
Alguien wrote: 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. dead Click Here To Show Diagram Code `[go]$$Bc $$---------------------- $$\|. 5 O . X . X . . . . $$\|O . . . O . X . . . . $$\|. 4 O . O . X . . . . $$\|. . X . . . X . . . . $$\|X X X X X X X . . . . $$\|. . . . . . . . . . .[/go]`

Author:	jts [ Thu Jan 03, 2013 8:20 am ]
Post subject:	Re: Difficult tsume go.
Click Here To Show Diagram Code `[go]$$Bc $$---------------------- $$\|. 5 O . X . X . . . . $$\|O 6 . 7 O . X . . . . $$\|. 4 O . O . X . . . . $$\|. . X . . . X . . . . $$\|X X X X X X X . . . . $$\|. . . . . . . . . . .[/go]` Ninja'd

Author:	drmwc [ Sun Jan 27, 2013 4:32 pm ]
Post subject:	Re: Difficult tsume go.
The correct solution has been posted - well done! Click Here To Show Diagram Code `[go]$$Bc $$------------ $$\|..O.1.X.... $$\|O...O.X.... $$\|..O.2.X.... $$\|..3...X.... $$\|XXXXXXX.... $$\|...........[/go]` 3 is the ridiculous looking tesuji that's needed. W has no reply.

Author:	SoDesuNe [ Mon Jan 28, 2013 8:53 am ]
Post subject:	Re: Difficult tsume go.
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.

Author:	drmwc [ Thu Jan 31, 2013 4:57 pm ]
Post subject:	Re: Difficult tsume go.
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.)

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