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Problem from a game
http://www.lifein19x19.com/viewtopic.php?f=15&t=8837
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Author:  Boidhre [ Wed Jul 31, 2013 3:33 am ]
Post subject:  Problem from a game

Can White live unconditionally here or is it a ko? It came up between myself and skydyr in a game last night, I think I found a move that works for white here but I'm not certain and would be interested in other viewpoints. :)

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


My idea:

Click Here To Show Diagram Code
[go]$$W a and b are miai
$$ ----------------------+
$$ . . . . . . . . . . . |
$$ . . . . . O b O . 2 a |
$$ . . X O X O X . O 3 . |
$$ . , . X . X . X X O 1 |
$$ . . . . X X . . . X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . , . . . . . , . . . |[/go]

Author:  HermanHiddema [ Wed Jul 31, 2013 3:39 am ]
Post subject:  Re: Problem from a game

White can live easily. Your move works, as do others in the corner.

The more interesting question, IMO, would be what the best endgame is.

I would expect play to go like this:

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


So then the next question: Is a black move at a now sente?

Author:  Boidhre [ Wed Jul 31, 2013 4:04 am ]
Post subject:  Re: Problem from a game

HermanHiddema wrote:
White can live easily. Your move works, as do others in the corner.

The more interesting question, IMO, would be what the best endgame is.

I would expect play to go like this:

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


So then the next question: Is a black move at a now sente?


I don't think it's sente, this seems the most severe sequence for Black for me:

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


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

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