2010 May 17 problem

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unkx80
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2010 May 17 problem

Post by unkx80 »

Here is an easy problem to mark my 100th post on this forum. :P
Click Here To Show Diagram Code
[go]$$Wc Status?
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X . |
$$ . . . X . . . . . . |
$$ --------------------[/go]
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SoDesuNe
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Re: 2010 May 17 problem

Post by SoDesuNe »

My try :o
If White goes first, it's dead.
Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X 2 |
$$ . . . X 5 . 4 1 3 . |
$$ --------------------[/go]
Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X 3 |
$$ . . . X 5 . 4 1 2 . |
$$ --------------------[/go]
Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X 3 |
$$ . . . X 4 . 5 1 2 . |
$$ --------------------[/go]
Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X 2 X 3 |
$$ . . . X . . . 1 . . |
$$ --------------------[/go]

If Black goes first, it's alive.
Click Here To Show Diagram Code
[go]$$Bc Alive as it is.
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X . |
$$ . . . X . . . 1 . . |
$$ --------------------[/go]
Click Here To Show Diagram Code
[go]$$Bc Alive as it is.
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X 1 |
$$ . . . X . . . . . . |
$$ --------------------[/go]
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Re: 2010 May 17 problem

Post by tapir »

I like how you design the outside of the group... I subconsciously started looking for black moves to play there :) Otherwise I have of course nothing to add to the solution posted already.
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topazg
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Re: 2010 May 17 problem

Post by topazg »

@SoDesuNe
Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X 2 |
$$ . . . X 4 . 5 1 3 . |
$$ --------------------[/go]
This is an important variation too ... White 5 leaves seki, so instead?
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Re: 2010 May 17 problem

Post by Magicwand »

topazg wrote:@SoDesuNe
Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X 2 |
$$ . . . X 4 . 5 1 3 . |
$$ --------------------[/go]
This is an important variation too ... White 5 leaves seki, so instead?
no seki
Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O 6 |
$$ . . . O . . O X X O |
$$ . O . O X X X 5 X 2 |
$$ . . . X 4 . 7 1 3 . |
$$ --------------------[/go]
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SoDesuNe
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Re: 2010 May 17 problem

Post by SoDesuNe »

topazg wrote:@SoDesuNe
Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X 2 |
$$ . . . X 4 . 5 1 3 . |
$$ --------------------[/go]
This is an important variation too ... White 5 leaves seki, so instead?
Okay, I spoiled it by looking at magicwand's answer =D But nonethesless a seki would be good for Black, as it actually is a dead group, when White moves first.
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Biondy
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Re: 2010 May 17 problem

Post by Biondy »

emm.... I think black dies here...
Click Here To Show Diagram Code
[go]$$Wc Status?
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X 3 |
$$ . . . X 5 . 4 1 2 . |
$$ --------------------[/go]
Click Here To Show Diagram Code
[go]$$Wc Status?
$$ . . . . . . . . . . |
$$ . . . . O . . O O . |
$$ . . . . . . O X O . |
$$ , . . . O X O X O . |
$$ . . . O . . O X X O |
$$ . O . O X X X . X 2 |
$$ . . . X 5 . 4 1 3 . |
$$ --------------------[/go]
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unkx80
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Re: 2010 May 17 problem

Post by unkx80 »

I guess most people who attempted this problem would have figured out the solution by now. Thanks for the attempts!
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Phelan
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Re: 2010 May 17 problem

Post by Phelan »

My guess:
Black lives unconditionally with seki, or can live with two eyes.
Addendum after looking at the solutions:
Completely missed the lack of liberties after white's cut. Basically what magicwand showed.
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