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Offline Charlie
 Post subject: 1001 L&D Problems #91
Post #1 Posted: Tue Mar 12, 2013 6:10 am 
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In 1001 Life and Death Problems, by R. Bozulich, problem 91 looks as follows:

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


Black to play and live.

Why doesn't 'a', below, work? (The correct answer is given as 'b' with the comment that it is bad shape but the only way to live.)

Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . .
$$ | . . O O O . . . . .
$$ | . . . X X O O . . ,
$$ | . O O X b a X O O .
$$ | . O X O . . X X O .
$$ | . . X . X . . X O .
$$ +---------------------[/go]


Answer to my own question:

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

[/go]
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Offline Boidhre
 Post subject: Re: 1001 L&D Problems #91
Post #2 Posted: Tue Mar 12, 2013 8:50 am 
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a leads to a very nasty shortage of liberties a bit further on if white plays E2. Being distracted by kids and haven't been playing lately so I could be wrong.
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Offline Bill Spight
 Post subject: Re: 1001 L&D Problems #91
Post #3 Posted: Tue Mar 12, 2013 8:55 am 
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What bad shape? ;)

Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . .
$$ | . . O O O . . . . .
$$ | . . . X X O O . . ,
$$ | . O O X . . X O O .
$$ | . O X W . . X X O .
$$ | . . X . X . C X O .
$$ +---------------------[/go]


Looking for potential eyes, we see the :ec: point and the :wc: stone. OC, we have to capture the :wc: stone first.

Click Here To Show Diagram Code
[go]$$Bc Diagonal
$$ | . . . . . . . . . .
$$ | . . O O O . . . . .
$$ | . . . X X O O . . ,
$$ | . O O X 1 2 X O O .
$$ | . O X W . 3 X X O .
$$ | . . X . X . C X O .
$$ +---------------------[/go]


:b1: is played on the diagonal of :wc:, to prevent the eye from becoming false. :b3: is on the diagonal of :ec:.

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


If White counters with :w2: on the diagonal of :ec:, Black just manages to capture it and live.

Click Here To Show Diagram Code
[go]$$Bc Wrong way
$$ | . . . . . . . . . .
$$ | . . O O O . . . . .
$$ | . . . X X O O . . ,
$$ | . O O X 4 2 X O O .
$$ | . O X W 1 3 X X O .
$$ | . . X . X . C X O .
$$ +---------------------[/go]


:b1: is the wrong way to capture, as :w4: can make the :wc: eye false.

Click Here To Show Diagram Code
[go]$$Bc Careless error
$$ | . . . . . . . . . .
$$ | . . O O O . . . . .
$$ | . . . X X O O . . ,
$$ | . O O X . 1 X O O .
$$ | . O X W 3 . X X O .
$$ | . 2 X 4 X 5 C X O .
$$ +---------------------[/go]


If White carelessly answers :b1: with :w2:, Black lives with :b3: and :b5:. :)

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.

This post by Bill Spight was liked by: rhubarb
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Offline Unusedname
 Post subject: Re: 1001 L&D Problems #91
Post #4 Posted: Tue Mar 12, 2013 2:09 pm 
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Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . .
$$ | . . O O O . . . . .
$$ | . . . X X O O . . ,
$$ | . O O X b a X O O .
$$ | . O X O . . X X O .
$$ | . . X . X . . X O .
$$ +---------------------[/go]


just an observation

you say b is bad shape but to me it looks like a is the bad shape.

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


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