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Tesuji problem
http://www.lifein19x19.com/viewtopic.php?f=11&t=6325		 Page 1 of 1
Author:  txcpa [ Sun Jul 15, 2012 10:56 pm ]
Post subject:  Tesuji problem
Below is a problem from the Elementary Go Series book, "Tesuji." This is problem 7 from the end of Chapter 2: Black to play and capture the cutting stones. I have shown the given answer as the first variation/branch, but I don't understand why the second variation isn't also correct. I don't see anywhere white can give double atari, at least not until the white group is already in atari itself. Am I missing something with this problem? Could it merely be that black ends up with a more preferable shape with the given answer, compared to the result of capturing with variation 2?





Attachments:
Tesuji.sgf [188 Bytes]
Downloaded 576 times
Author:  speedchase [ Sun Jul 15, 2012 10:59 pm ]
Post subject:  Re: Tesuji problem


Attachments:
Tesuji.sgf [287 Bytes]
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Author:  txcpa [ Sun Jul 15, 2012 11:20 pm ]
Post subject:  Re: Tesuji problem
Thanks a bunch!!
Author:  speedchase [ Sun Jul 15, 2012 11:22 pm ]
Post subject:  Re: Tesuji problem
no problem :)
Author:  txcpa [ Sun Jul 15, 2012 11:27 pm ]
Post subject:  Re: Tesuji problem
I remember considering the variation you posted, but didn't see the white clamping move at N5 -- I clearly didn't read far enough ahead. It seems so obvious now that I've seen it.
Author:  EdLee [ Mon Jul 16, 2012 12:37 am ]
Post subject: 
txcpa wrote:
...but didn't see the white clamping move at N5 --
You mean atari, not clamp. :)
Examples:
Click Here To Show Diagram Code
[go]$$W :w1: = clamp
$$ . . . . . . .
$$ . . . 1 . . .
$$ . . . X . . .
$$ . X X O X X .
$$ . . . O . . .
$$ . . O . O . .
$$ . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$W :w1: = atari
$$ . . . . . . .
$$ . . . 1 . . .
$$ . . . X O . .
$$ . X X O X X .
$$ . . . O . . .
$$ . . O . O . .
$$ . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$W :w1: = atari
$$ . . . . . . .
$$ . . . . . . .
$$ . . 1 X O . .
$$ . X X O X X .
$$ . . . O . . .
$$ . . O . O . .
$$ . . . . . . .[/go]
Author:  txcpa [ Mon Jul 16, 2012 9:53 am ]
Post subject:  Re:
EdLee wrote:
txcpa wrote:
...but didn't see the white clamping move at N5 --
You mean atari, not clamp. :)
Examples:
Click Here To Show Diagram Code
[go]$$W :w1: = clamp
$$ . . . . . . .
$$ . . . 1 . . .
$$ . . . X . . .
$$ . X X O X X .
$$ . . . O . . .
$$ . . O . O . .
$$ . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$W :w1: = atari
$$ . . . . . . .
$$ . . . 1 . . .
$$ . . . X O . .
$$ . X X O X X .
$$ . . . O . . .
$$ . . O . O . .
$$ . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$W :w1: = atari
$$ . . . . . . .
$$ . . . . . . .
$$ . . 1 X O . .
$$ . X X O X X .
$$ . . . O . . .
$$ . . O . O . .
$$ . . . . . . .[/go]


Okay, thanks for the correction. I was debating on whether to use the word "clamp" with my post, since I wasn't quite sure if the atari mentioned could also be called a clamp (as it sort of "squeezes" the stone from opposite side), but I knew the top example you gave is clearly a clamp.
Author:  shmit [ Mon Jul 16, 2012 9:12 pm ]
Post subject:  Re: Tesuji problem
The sequence that speedchase showed to escape is really useful to remember. It was played against me in probably half my games when I was a ddk. Also that chapter in the book ('knights move tesuji') is just to show a way to avoid this escaping sequence.
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