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Please review this tsumego problem that came up- 2k Fox
http://www.lifein19x19.com/viewtopic.php?f=4&t=16310
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Author:  negapesuo [ Fri Dec 21, 2018 1:26 pm ]
Post subject:  Please review this tsumego problem that came up- 2k Fox

Towards the end, the white group on the right side died because he misplayed the tsumego. I believe it was alive unconditionally, but can anyone see if they are able to kill it?

If anyone is willing to provide an overall review for black, that'd be great. Thank you for the review.



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[negapesuo]vs[江南翰子]_2k match.sgf [1021 Bytes]
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Author:  Joaz Banbeck [ Fri Dec 21, 2018 6:49 pm ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

As requested, a review for black. Comments extend all the way to move 133.


Author:  Tryss [ Sat Dec 22, 2018 1:16 am ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

@Joaz : in your variation for :b89:, what if :w90: is at Q18 ?

Author:  jlt [ Sat Dec 22, 2018 1:33 am ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

Wrong, ignore.

Could White live like this?

Click Here To Show Diagram Code
[go]$$W
$$ X . O X . . . |
$$ O O . O X . . |
$$ X O O . X X . |
$$ X X X X . O 2 |
$$ O O O X O 4 3 |
$$ X X X O O 1 X |
$$ X . X X O O 5 |
$$ . X O X O . O |
$$ . . . O X O . |
$$ O . X . X X . |
$$ O X . . X . . |
$$ . . . . . . . |[/go]

Author:  Tryss [ Sat Dec 22, 2018 1:46 am ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

@jtl : No, because then

Click Here To Show Diagram Code
[go]$$B
$$ X . O X . . . |
$$ O O . O X . . |
$$ X O O . X X . |
$$ X X X X 1 O X |
$$ O O O X O X . |
$$ X X X O O O X |
$$ X . X X O O O |
$$ . X O X O . O |
$$ . . . O X O . |
$$ O . X . X X . |
$$ O X . . X . . |
$$ . . . . . . . |[/go]


But white can live :

Click Here To Show Diagram Code
[go]$$W
$$ X . O X . . . |
$$ O O . O X . . |
$$ X O O . X X . |
$$ X X X X . O . |
$$ O O O X O . 1 |
$$ X X X O O . X |
$$ X . X X O O . |
$$ . X O X O . O |
$$ . . . O X O . |
$$ O . X . X X . |
$$ O X . . X . . |
$$ . . . . . . . |[/go]

Author:  jlt [ Sat Dec 22, 2018 1:48 am ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

Yes of course, I just realized this after posting...

Author:  Shaddy [ Sat Dec 22, 2018 12:19 pm ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

127 at S12 should kill unconditionally. 131 should hane on the other side instead of blocking.

Author:  negapesuo [ Sat Dec 22, 2018 12:25 pm ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

Tryss wrote:
@Joaz : in your variation for :b89:, what if :w90: is at Q18 ?


Yes, also confused by this.

Author:  negapesuo [ Sat Dec 22, 2018 12:28 pm ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

Shaddy wrote:
127 at S12 should kill unconditionally. 131 should hane on the other side instead of blocking.


I see... There was no reason for me to cut since the group is already cut off in miai.

Author:  Joaz Banbeck [ Sun Dec 23, 2018 12:26 am ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

Tryss wrote:
@Joaz : in your variation for :b89:, what if :w90: is at Q18 ?


Then black dies. Sorry about that. I was reading too fast. :oops:

Author:  ez4u [ Sun Dec 23, 2018 6:18 am ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

White should play 114 at P12. So can Black play 113 at Q12?

Author:  Joaz Banbeck [ Sun Dec 23, 2018 1:40 pm ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

ez4u wrote:
White should play 114 at P12. So can Black play 113 at Q12?

I was thinking much the same, since P9 and R9 are miai. But 113 at P12 works also, and guarantees a connection to the upper right stones.

Nice sig, BTW. I had read it before, but I couldn't remember where.

Author:  kyulearner [ Tue Dec 25, 2018 7:47 pm ]
Post subject:  Re: Please review this tsumego problem that came up- 2k Fox

Regarding 3rd line stones, there is saying in Japan that 4 dies and 6 lives (5 depends on who has sente). So you should strive to make a 3rd line of 6 stones or make a line of 5 stones+sente, if you want to live within an opponent framework.

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