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 Post subject: Question about a Tesuji problem
Post #1 Posted: Sun Nov 19, 2017 3:19 pm 
Dies with sente

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In James Davies Tesuji there is a particular problem regarding a capture race:

White to play


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



The solution given is :

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


Where 2 and 3 are miai (maybe I am not understanding this).

I can't quite see what the solution would be if Black played :



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



If White then plays :w3: black can just counter with :b4:. Now White cannot play the marked point due to a shortage of liberties:


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



Black then wins the capture race :

Click Here To Show Diagram Code
[go]$$W
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . X . . |
$$ . . , . O O X X X . . . |
$$ . . O O X X O O X O X . |
$$ . . O X . X . O O X X . |
$$ . . 5 7 2 3 1 8 4 6 . . |
$$ ------------------------+[/go]


If White tries to come in from the other side, they still lose :

Click Here To Show Diagram Code
[go]$$W
$$ . . . . . . . . . . . . |
$$ . . . . . . . . . X . . |
$$ . . , . O O X X X . . . |
$$ . . O O X X O O X O X . |
$$ . . O X . X . O O X X . |
$$ . . 3 5 2 7 1 8 4 6 . . |
$$ ------------------------+[/go]


Not quite sure what I am missing. Is there a problem with the problem or a problem with my problem solving?

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 Post subject: Re: Question about a Tesuji problem
Post #2 Posted: Sun Nov 19, 2017 4:19 pm 
Judan

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I think your analysis is correct.

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 Post subject: Re: Question about a Tesuji problem
Post #3 Posted: Sun Nov 19, 2017 5:25 pm 
Lives with ko

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I think that after White 1 Black 2, the right move for White is to play at Black 4.

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 Post subject: Re: Question about a Tesuji problem
Post #4 Posted: Sun Nov 19, 2017 6:28 pm 
Judan

Posts: 7978
Liked others: 1408
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Tygem: 커비라고해
Pio2001 wrote:
I think that after White 1 Black 2, the right move for White is to play at Black 4.


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

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