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Offline tj86430
 Post subject: Interesting(?) corner position from a game
Post #1 Posted: Fri Aug 27, 2010 6:44 am 
Gosei

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This comes from a recent game of mine (slightly modified to focus on the main issue):

Click Here To Show Diagram Code
[go]$$Wc
$$--------
$$|.......
$$|..XO...
$$|.XX..O.
$$|.O.XXO.
$$|...XOO.
$$|..OOO..
$$|.......[/go]


White to play. What is the status of the black corner? (In the game it died, but I suspect that there were at least one, quite possibly several blunders - on both sides).

If white can kill playing first, what is the status if it is black's turn?

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Offline phrax
 Post subject: Re: Interesting(?) corner position from a game
Post #2 Posted: Fri Aug 27, 2010 7:28 am 
Dies with sente

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Click Here To Show Diagram Code
[go]$$Bc
$$--------
$$|.......
$$|..XO1..
$$|.XX..O.
$$|.O.XXO.
$$|.a.XOO.
$$|..OOO..
$$|.......[/go]


I feel like I'm missing something, but I think 1 gives black a second eye. And if white plays first (taking 1); 1 and A are miai, so Black 2 at A. So black lives?
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Offline MagicMagor
 Post subject: Re: Interesting(?) corner position from a game
Post #3 Posted: Fri Aug 27, 2010 7:32 am 
Lives with ko
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Quote:
White to play. What is the status of the black corner?

Alive.
Click Here To Show Diagram Code
[go]$$Wc
$$--------
$$|.......
$$|..XOa..
$$|.XX..O.
$$|.O.XXO.
$$|.a.XOO.
$$|..OOO..
$$|.......[/go]

Black can play at a (anyone) and capture a white stone. Together with the eye in the corner, he is safely alive.

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Offline tj86430
 Post subject: Re: Interesting(?) corner position from a game
Post #4 Posted: Fri Aug 27, 2010 7:50 am 
Gosei

Posts: 1348
Location: Finland
Liked others: 49
Was liked: 129
Rank: FGA 7k GoR 1297
This is what happened in the actual game (it was a fast game):

Click Here To Show Diagram Code
[go]$$Wc
$$--------
$$|.598...
$$|4.XO67.
$$|.XX0.O.
$$|.O2XXO.
$$|3.1XOO.
$$|..OOO..
$$|.......[/go]


Click Here To Show Diagram Code
[go]$$Wc
$$--------
$$|4OOX31.
$$|X2X.XO.
$$|.XXX5O.
$$|.OXXXO.
$$|O.OXOO.
$$|..OOO..
$$|.......[/go]

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