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Problem from a game
http://www.lifein19x19.com/viewtopic.php?f=15&t=6560		 Page 1 of 1
Author:  yoyoma [ Wed Aug 22, 2012 12:01 pm ]
Post subject:  Problem from a game
Problem from a game my friend played:

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



Edit: Added white support stone outside.
Author:  Joaz Banbeck [ Wed Aug 22, 2012 12:23 pm ]
Post subject:  Re: Problem from a game
B wins like this with natural moves because W requires an approach move at 'a'.

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


So...

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


A ko, I think.
Author:  topazg [ Wed Aug 22, 2012 12:28 pm ]
Post subject:  Re: Problem from a game
Go Diagram
Click Here To Show Diagram Code
[go]$$
$$ ---------------------------------------
$$ | . . . . . . . . . . . 2 . . . . . . . |
$$ | . . . . . . . . . . 1 O . X . . . . . |
$$ | . . . . . O . O X X . O X X . . . . . |
$$ | . . . , . . . O O X X O X . . , . . . |
$$ | . . . . . . . . O O O X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Author:  Joaz Banbeck [ Wed Aug 22, 2012 12:57 pm ]
Post subject:  Re: Problem from a game
topazg wrote:
Go Diagram
Click Here To Show Diagram Code
[go]$$
$$ ---------------------------------------
$$ | . . . . . . . . . . . 2 . . . . . . . |
$$ | . . . . . . . . . . 1 O . X . . . . . |
$$ | . . . . . O . O X X . O X X . . . . . |
$$ | . . . , . . . O O X X O X . . , . . . |
$$ | . . . . . . . . O O O X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


I haven't read all lines, but my first impression is that this ends in...
...seki:

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


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


@Yoyoma: thanks for an interesting thread. :bow:
Author:  topazg [ Wed Aug 22, 2012 1:03 pm ]
Post subject:  Re: Problem from a game
@Joaz:

Yeah, seki was what I kept coming down to as well with a few different lines :)
Author:  Joaz Banbeck [ Wed Aug 22, 2012 1:05 pm ]
Post subject:  Re: Problem from a game
I have wasted too much time on this. I have work to do. :cry:

So I leave my best guess:
If 3 in the post above is the best answer to Topazg's 2, then that suggests that it is the vital point. So maybe white should play it first:
Go Diagram
Click Here To Show Diagram Code
[go]$$
$$ ---------------------------------------
$$ | . . . . . . . . . 2 . . . . . . . . . |
$$ | . . . . . . . . . . 1 O . X . . . . . |
$$ | . . . . . O . O X X . O X X . . . . . |
$$ | . . . , . . . O O X X O X . . , . . . |
$$ | . . . . . . . . O O O X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Author:  topazg [ Wed Aug 22, 2012 1:11 pm ]
Post subject:  Re: Problem from a game
Go Diagram
Click Here To Show Diagram Code
[go]$$
$$ ---------------------------------------
$$ | . . . . . . . . . 2 5 3 4 . . . . . . |
$$ | . . . . . . . . . 6 1 O . X . . . . . |
$$ | . . . . . O . O X X . O X X . . . . . |
$$ | . . . , . . . O O X X O X . . , . . . |
$$ | . . . . . . . . O O O X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


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


But ...


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


seki again .. Hmmmm....
Author:  cyclops [ Wed Aug 22, 2012 5:02 pm ]
Post subject:  Re: Problem from a game
I explored the hane for :w2: . I guess it result in ko.
Go Diagram
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . 0 . 9 . 2 . . . .
$$ . 8 7 3 5 4 . O . X .
$$ . O . O X X 6 O X X .
$$ . . . O O X X O X . .
$$ . . . . O O O X X . .
$$ . . . . . . . . . . .[/go]
Author:  Joaz Banbeck [ Wed Aug 22, 2012 9:00 pm ]
Post subject:  Re: Problem from a game
cyclops wrote:
I explored the hane for :w2: . I guess it result in ko.
Go Diagram
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . 0 . 9 . 2 . . . .
$$ . 8 7 3 5 4 . O . X .
$$ . O . O X X 6 O X X .
$$ . . . O O X X O X . .
$$ . . . . O O O X X . .
$$ . . . . . . . . . . .[/go]

Or a ko like this:
Go Diagram
Click Here To Show Diagram Code
[go]$$
$$ ---------------------------------------
$$ | . . . . . . . . . 3 2 4 . . . . . . . |
$$ | . . . . . . . . 5 . 1 O . X . . . . . |
$$ | . . . . . O . O X X 6 O X X . . . . . |
$$ | . . . , . . . O O X X O X . . , . . . |
$$ | . . . . . . . . O O O X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Author:  yoyoma [ Thu Aug 23, 2012 1:31 pm ]
Post subject:  Re: Problem from a game
Well I don't claim to know the result, but here are some variations I came up with:
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