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 Post subject: Tsumego Fun for Low Dan (2019 June 6th)
Post #1 Posted: Thu Jun 06, 2019 12:17 am 
Gosei
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Chapter 1 Foundation Problems - Problem 24 from a new book 基礎から始める河野臨の詰碁 ISBN9784839967307
Rated as appropriate for low dan level. Enjoy
Black to move

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


Will give the answer under hide in about a week or two.

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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #2 Posted: Thu Jun 06, 2019 7:22 pm 
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Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . .
$$ | X X X X X . . . . .
$$ | . O 2 O X . . . . ,
$$ | . . 1 O X X X X X .
$$ | O . . 3 O . . . X .
$$ | . . . . . . . . X .
$$ +---------------------[/go]

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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #3 Posted: Thu Jun 06, 2019 8:37 pm 
Tengen
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Without reading, my vital point sensibilities say this:

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

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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #4 Posted: Thu Jun 06, 2019 8:42 pm 
Tengen
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Shaddy wrote:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . .
$$ | X X X X X . . . . .
$$ | . O 2 O X . . . . ,
$$ | . . 1 O X X X X X .
$$ | O . . 3 O . . . X .
$$ | . . . . . . . . X .
$$ +---------------------[/go]


What if white does not get greedy?
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . .
$$ | X X X X X . . . . .
$$ | . O . O X . . . . ,
$$ | . . 1 O X X X X X .
$$ | O . 2 . O . . . X .
$$ | . . . . . . . . X .
$$ +---------------------[/go]

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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #5 Posted: Thu Jun 06, 2019 8:50 pm 
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Joaz Banbeck wrote:
Shaddy wrote:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . .
$$ | X X X X X . . . . .
$$ | . O 2 O X . . . . ,
$$ | . . 1 O X X X X X .
$$ | O . . 3 O . . . X .
$$ | . . . . . . . . X .
$$ +---------------------[/go]


What if white does not get greedy?
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . .
$$ | X X X X X . . . . .
$$ | . O . O X . . . . ,
$$ | . . 1 O X X X X X .
$$ | O . 2 . O . . . X .
$$ | . . . . . . . . X .
$$ +---------------------[/go]

Just atari kills.

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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #6 Posted: Thu Jun 06, 2019 10:03 pm 
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Two refutations

Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | X X X X X . . . . .
$$ | . O 3 O X . . . . ,
$$ | . 5 1 O X X X X X .
$$ | O 6 2 4 O 0 . . X .
$$ | . 8 . 9 7 . . . X .
$$ +---------------------[/go]


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

Main line: edit, no
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | X X X X X . . . . .
$$ | 5 O 7 O X . . . . ,
$$ | 6 4 8 O X X X X X .
$$ | O 3 1 2 O a b . X .
$$ | . 9 . d . c . . X .
$$ +---------------------[/go]

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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #7 Posted: Thu Jun 06, 2019 10:18 pm 
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Posts: 1172
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Rank: KGS 5d
KGS: Str1fe, Midorisuke
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . .
$$ | X X X X X . . . . .
$$ | . O 3 O X . . . . ,
$$ | . 5 1 O X X X X X .
$$ | O 6 2 4 O 0 . . X .
$$ | . 8 . 9 7 . . . X .
$$ +---------------------[/go]

5 @ 6
In your main line, 6 @ 1-2 point makes ko

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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #8 Posted: Thu Jun 20, 2019 2:59 am 
Gosei
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Go is such a beautiful game.


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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #9 Posted: Tue Jun 25, 2019 10:29 pm 
Tengen
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tchan001 wrote:
...

Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | X X X X X . . . . . . . . . . . . . . |
$$ | 5 O 7 O X . . . . , . . . . . , . . . |
$$ | 6 4 8 O X X X X X . . . . . . . . . . |
$$ | O 3 1 2 O 0 . . X . . . . . . . . . . |
$$ | . 9 . . . . . . X . . . . . . . . . . |
$$ ---------------------------------------[/go]

...then...

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


...Ko...


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


Maybe I'm missing something, but if black plays G1 instead of F1, I see no ko. White looks dead to me.

I still think that C2 kills.

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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #10 Posted: Tue Jun 25, 2019 11:41 pm 
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Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | X X X X X . . . . . . . . . . . . . . |
$$ | 5 O . O X . . . . , . . . . . , . . . |
$$ | 7 4 . O X X X X X . . . . . . . . . . |
$$ | O 3 1 2 O . . . X . . . . . . . . . . |
$$ | . 6 . . . . . . X . . . . . . . . . . |
$$ ---------------------------------------[/go]

Ko

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

Seki


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 Post subject: Re: Tsumego Fun for Low Dan (2019 June 6th)
Post #11 Posted: Wed Jun 26, 2019 6:46 pm 
Gosei
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Books are not always correct but as I am not a tsumego expert, I can only provide the answer from the book.

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Go is such a beautiful game.

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