501 tesuji problems #90 in error?

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cyclops
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501 tesuji problems #90 in error?

Post by cyclops »

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]
I think I am so I think I am.
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Re: 501 tesuji problems #90 in error?

Post by illluck »

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]
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Mike Novack
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Re: 501 tesuji problems #90 in error?

Post by Mike Novack »

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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cyclops
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Re: 501 tesuji problems #90 in error?

Post by cyclops »

OK, I am convinced. ( I was 99% sure that I was correct, what a failure :oops: )
I think I am so I think I am.
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