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Problem from a game
Posted: Wed Jul 31, 2013 3:33 am
by Boidhre
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.
$$W White to play
$$ ----------------------+
$$ . . . . . . . . . . . |
$$ . . . . . O . O . . . |
$$ . . X O X O X . O . . |
$$ . , . X . X . X X O . |
$$ . . . . X X . . . X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . , . . . . . , . . . |
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:
Re: Problem from a game
Posted: Wed Jul 31, 2013 3:39 am
by HermanHiddema
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:
$$W White to play
$$ ----------------------+
$$ . . . . . . . . . . . |
$$ . . . . a O 1 O . 3 5 |
$$ . . X O X O X . O 2 . |
$$ . , . X . X . X X O 4 |
$$ . . . . X X . . . X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . , . . . . . , . . . |
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?
Re: Problem from a game
Posted: Wed Jul 31, 2013 4:04 am
by Boidhre
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:
$$W White to play
$$ ----------------------+
$$ . . . . . . . . . . . |
$$ . . . . a O 1 O . 3 5 |
$$ . . X O X O X . O 2 . |
$$ . , . X . X . X X O 4 |
$$ . . . . X X . . . X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . , . . . . . , . . . |
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:
$$B
$$ ----------------------+
$$ . . . . . 1 . 3 4 . . |
$$ . . . . X O O O . O O |
$$ . . X O X O X 2 O X . |
$$ . , . X . X . X X . X |
$$ . . . . X X . . . X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . , . . . . . , . . . |
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]
$$B
$$ ----------------------+
$$ . . . . . 1 . . 3 4 . |
$$ . . . . X O O O . O O |
$$ . . X O X O X 2 O X . |
$$ . , . X . X . X X . X |
$$ . . . . X X . . . X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . , . . . . . , . . . |
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]