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 Post subject: Question about a problem
Post #1 Posted: Wed Dec 20, 2017 1:41 pm 
Dies with sente

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Graded Go Problems for Beginners Volume 3, problem 300

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


Black to kill.


The given solution is :

Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . X . . . . . .
$$ | . . X X X . . .
$$ | X X O O . . . .
$$ | X O X O . X . .
$$ | 3 O X O . . . .
$$ | . . 2 O X X . .
$$ | . 1 . O O X . .
$$ | . . . . . . . .
$$ +----------------[/go]


However, surely if White plays :

Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . X . . . . . .
$$ | . . X X X . . .
$$ | X X O O . . . .
$$ | X O X O . X . .
$$ | . O X O . . . .
$$ | . 2 . O X X . .
$$ | . 1 . O O X . .
$$ | . . . . . . . .
$$ +----------------[/go]


Then there would be no way for Black to kill.


Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . X . . . . . .
$$ | . . X X X . . .
$$ | X X O O . . . .
$$ | X O X O . X . .
$$ | 3 O X O . . . .
$$ | 4 2 6 O X X . .
$$ | 5 1 . O O X . .
$$ | . . . . . . . .
$$ +----------------[/go]



Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . X . . . . . .
$$ | . . X X X . . .
$$ | X X O O . . . .
$$ | X O X O . X . .
$$ | . O X O . . . .
$$ | . 2 5 O X X . .
$$ | 4 1 3 O O X . .
$$ | . . 6 . . . . .
$$ +----------------[/go]



Is there some variation I'm missing?

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 Post subject: Re: Question about a problem
Post #2 Posted: Wed Dec 20, 2017 2:19 pm 
Honinbo

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mongus wrote:
However, surely if White plays :

Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . X . . . . . .
$$ | . . X X X . . .
$$ | X X O O . . . .
$$ | X O X O . X . .
$$ | . O X O . . . .
$$ | . 2 . O X X . .
$$ | . 1 . O O X . .
$$ | . . . . . . . .
$$ +----------------[/go]


Then there would be no way for Black to kill.


Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . X . . . . . .
$$ | . . X X X . . .
$$ | X X O O . . . .
$$ | X O X O . X . .
$$ | 3 O X O . . . .
$$ | 4 2 6 O X X . .
$$ | 5 1 . O O X . .
$$ | . . . . . . . .
$$ +----------------[/go]



Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . X . . . . . .
$$ | . . X X X . . .
$$ | X X O O . . . .
$$ | X O X O . X . .
$$ | . O X O . . . .
$$ | . 2 5 O X X . .
$$ | 4 1 3 O O X . .
$$ | . . 6 . . . . .
$$ +----------------[/go]



Is there some variation I'm missing?


:b3: is the key. :)

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 Post subject: Re: Question about a problem
Post #3 Posted: Wed Dec 20, 2017 2:25 pm 
Lives in gote

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Another hint,
Look for some liberty shortage

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 Post subject: Re: Question about a problem
Post #4 Posted: Wed Dec 20, 2017 3:31 pm 
Dies with sente

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Ah yes, think I've got it :

Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . X . . . . . .
$$ | . . X X X . . .
$$ | X X O O . . . .
$$ | X O X O . X . .
$$ | 4 O X O . . . .
$$ | 3 2 . O X X . .
$$ | . 1 . O O X . .
$$ | . . . . . . . .
$$ +----------------[/go]


Of course, White cannot play 4.

I really struggle to read out liberty shortage problems. Thanks for the hints!


This post by mongus was liked by: Bill Spight
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