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 Post subject: Tsumego question
Post #1 Posted: Sun Jan 22, 2017 2:15 pm 
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At 8:39, can't White live in seki with Q19?

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 Post subject: Re: Tsumego question
Post #2 Posted: Sun Jan 22, 2017 2:18 pm 
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No, R18 makes miai of playing below or to the right.

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 Post subject: Re: Tsumego question
Post #3 Posted: Sun Jan 22, 2017 2:35 pm 
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Click Here To Show Diagram Code
[go]$$W
$$ ------------------
$$ . . . . . 1 . O . |
$$ . . . X X O 2 4 X |
$$ . . X X O O 3 O O |
$$ . . X O X X O X . |
$$ . . X . . X . X . |
$$ . . X . X . . O . |
$$ . . X X . . . X . |
$$ . . . X X X X X . |
$$ . . . . . . . . . |[/go]

I thought this was seki, but I was seeing it wrong. The White stone at 1-2 isn't connected to the rest. :-?

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 Post subject: Re: Tsumego question
Post #4 Posted: Mon Jan 23, 2017 1:04 am 
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luigi wrote:
I thought this was seki, but I was seeing it wrong. The White stone at 1-2 isn't connected to the rest. :-?

This is not the problem here.

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

If the problem was not in the corner, but at the side, your suggestion would end in seki.

In the corner-shape, Black can give atari from the outside, so Black's three stones inside form a dead eye-shape.

At the side, White's group has two liberties left inside. Black can give atari only by creating a shape inside that consist of four stones in a row. Capturing these four stones results in a living shape for White.

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The really most difficult Go problem ever: https://igohatsuyoron120.de/index.htm
Igo Hatsuyōron #120 (really solved by KataGo)


This post by Cassandra was liked by 3 people: Bill Spight, ez4u, luigi
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