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 Post subject: Dieter's ABC of mistakes - 12
Post #1 Posted: Tue Apr 13, 2021 8:27 am 
Gosei
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Click Here To Show Diagram Code
[go]$$Bc Mistake 12
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X X X O . O . . . . . . . . |
$$ | . . X X O O O X . . . X X O . . . . . |
$$ | . . O O X . . X X O O O X . . O . . . |
$$ | . . X X X O O X O O X X X X . . O . . |
$$ | . . O O O O X X O X O O . . . X X . . |
$$ | . . O X O X X O O X . . . . . . . . . |
$$ | . . . X X O O O . X O . O X . . . . . |
$$ | . O O X . X O O O X . O X X . X X . . |
$$ | . . X , X X X O X , . O O . . X O . . |
$$ | . O X X O . O X X X . . . O . O O . . |
$$ | . . O O . O O O O X . . X O . O . . . |
$$ | . . . . O . X X . X . X X X X X O . . |
$$ | . . O O . . O X . X . . O . . . O . . |
$$ | . . X . . X O O O O . X O . . . . . . |
$$ | . . . X . . . . . X . . O X X X X X . |
$$ | . . . . . X . O . . . . O X O O O X . |
$$ | . . . . . . . . . . . O . O . . . O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Black was a little confused here. Take a good look: where would you play?

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 Post subject: Re: Dieter's ABC of mistakes - 12
Post #2 Posted: Tue Apr 13, 2021 10:13 am 
Gosei
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If I counted correctly, both Black and White have four liberties so Black wins the capturing race.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . 7 6 3 8 . . . . . . . . |
$$ | . . . . X X X X O 1 O 9 . . . . . . . |
$$ | . . X X O O O X 4 2 5 X X O . . . . . |
$$ | . . O O X . . X X O O O X . . O . . . |
$$ | . . X X X O O X O O X X X X . . O . . |
$$ | . . O O O O X X O X O O . . . X X . . |
$$ | . . O X O X X O O X . . . . . . . . . |
$$ | . . . X X O O O . X O . O X . . . . . |
$$ | . O O X . X O O O X . O X X . X X . . |
$$ | . . X , X X X O X , . O O . . X O . . |
$$ | . O X X O . O X X X . . . O . O O . . |
$$ | . . O O . O O O O X . . X O . O . . . |
$$ | . . . . O . X X . X . X X X X X O . . |
$$ | . . O O . . O X . X . . O . . . O . . |
$$ | . . X . . X O O O O . X O . . . . . . |
$$ | . . . X . . . . . X . . O X X X X X . |
$$ | . . . . . X . O . . . . O X O O O X . |
$$ | . . . . . . . . . . . O . O . . . O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


So the game may proceed like this:

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

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 Post subject: Re: Dieter's ABC of mistakes - 12
Post #3 Posted: Thu Apr 15, 2021 11:03 am 
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Click Here To Show Diagram Code
[go]$$Bc Mistake 12
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X X X O a O . . . . . . . . |
$$ | . . X X O O O X . a . X X O . . . . . |
$$ | . . O O X . . X X O O O X . . O . . . |
$$ | . . X X X O O X O O X X X X . . O . . |
$$ | . . O O O O X X O X O O . . . X X . . |
$$ | . . O X O X X O O X . . . . . . . . . |
$$ | . . . X X O O O . X O . O X . . . . . |
$$ | . O O X . X O O O X . O X X . X X . . |
$$ | . . X , X X X O X , . O O . . X O . . |
$$ | . O X X O . O X X X . . . O . O O . . |
$$ | . . O O . O O O O X . . X O . O . . . |
$$ | . . . . O . X X . X . X X X X X O . . |
$$ | . . O O . . O X . X . . O . . . O . . |
$$ | . . X . . X O O O O . X O . . . . . . |
$$ | . . . X . . . . . X . . O X X X X X . |
$$ | . . . . . X . O . . . . O X O O O X . |
$$ | . . . . . . . . . . . O . O . . . O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Either move marked 'a' looks to be good to capture the group. The tesuji books would probably go for the second line version.

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 Post subject: Re: Dieter's ABC of mistakes - 12
Post #4 Posted: Fri Apr 30, 2021 1:39 am 
Gosei
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I knew I had seen that problem before. This is in "Graded go problems for dan players, volume 2".

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