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Offline cyclops
 Post subject: 501 tesuji problems #90 in error?
Post #1 Posted: Thu Aug 22, 2013 5:08 pm 
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By Richard Bozulich, a great problem book for learning, recognizing and categorizing tesuji.
How can the black stones live in the corner?
Click Here To Show Diagram Code
[go]$$Bc problem #90, black to live
$$ +-------------------+
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ | . . , . . . , . . |
$$ | . . . . . . . . . |
$$ | . O O . , . . . . |
$$ | . . X O O O . . . |
$$ | . . X X X O , O . |
$$ | . . . O . X O . . |
$$ | . . . . X . . . . |
$$ +-------------------+[/go]


book's answers

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


Click Here To Show Diagram Code
[go]$$Bc toughest resistance
$$ +-------------------+
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ | . . , . . . , . . |
$$ | . . . . . . . . . |
$$ | . O O . , . . . . |
$$ | . . X O O O . . . |
$$ | . 5 X X X O , O . |
$$ | 1 4 2 O 3 X O . . |
$$ | . 6 7 . X . . . . |
$$ +-------------------+[/go]


I think b cannot live unconditionally and that the book is wrong
Click Here To Show Diagram Code
[go]$$Bc my resistance
$$ +-------------------+
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ | . . , . . . , . . |
$$ | . . . . . . . . . |
$$ | . O O . , . . . . |
$$ | . . X O O O . . . |
$$ | . 5 X X X O , O . |
$$ | 1 4 2 O 3 X O . . |
$$ | . . 6 . X . . . . |
$$ +-------------------+[/go]


If they postpone the ko this results eventually in:

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

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Offline illluck
 Post subject: Re: 501 tesuji problems #90 in error?
Post #2 Posted: Thu Aug 22, 2013 5:27 pm 
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My reading is terrible for sure (couldn't solve this at all), but the resistance doesn't work:
Click Here To Show Diagram Code
[go]$$Bc
$$ +-------------------+
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ | . . , . . . , . . |
$$ | . . . . . . . . . |
$$ | . O O . , . . . . |
$$ | . . X O O O . . . |
$$ | 9 5 X X X O , O . |
$$ | 1 4 2 O 3 X O . . |
$$ | 8 7 6 . X . . . . |
$$ +-------------------+[/go]

This post by illluck was liked by 3 people: frankie99, RBerenguel, Sverre
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Offline Mike Novack
 Post subject: Re: 501 tesuji problems #90 in error?
Post #3 Posted: Thu Aug 22, 2013 5:39 pm 
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What ko?

Black 7 at B1
White 8 at A1 (forced)
Black 9 connects at A3 and with three outside liberties will be able to play D1 to kill the white stones.

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Offline cyclops
 Post subject: Re: 501 tesuji problems #90 in error?
Post #4 Posted: Fri Aug 23, 2013 2:40 am 
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OK, I am convinced. ( I was 99% sure that I was correct, what a failure :oops: )

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