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Offline unkx80
 Post subject: 2010 May 17 problem
Post #1 Posted: Sun May 16, 2010 11:52 am 
Lives with ko
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Posts: 256
Location: Singapore
Liked others: 13
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Rank: Dan player
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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This post by unkx80 was liked by 2 people: SoDesuNe, tapir
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Offline SoDesuNe
 Post subject: Re: 2010 May 17 problem
Post #2 Posted: Sun May 16, 2010 12:08 pm 
Gosei
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Posts: 1810
Liked others: 490
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Rank: KGS 1-dan
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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Offline tapir
 Post subject: Re: 2010 May 17 problem
Post #3 Posted: Sun May 16, 2010 1:47 pm 
Lives in sente

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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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Offline topazg
 Post subject: Re: 2010 May 17 problem
Post #4 Posted: Sun May 16, 2010 1:54 pm 
Tengen
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Posts: 4511
Location: Chatteris, UK
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Rank: Nebulous
GD Posts: 918
KGS: 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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Offline Magicwand
 Post subject: Re: 2010 May 17 problem
Post #5 Posted: Sun May 16, 2010 1:56 pm 
Tengen
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Posts: 4844
Location: Mechanicsburg, PA
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Rank: Wbaduk 7D
KGS: magicwand
Tygem: magicwand
Wbaduk: rlatkfkd
DGS: magicwand
OGS: 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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Offline SoDesuNe
 Post subject: Re: 2010 May 17 problem
Post #6 Posted: Mon May 17, 2010 1:19 am 
Gosei
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Posts: 1810
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Rank: KGS 1-dan
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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Offline Biondy
 Post subject: Re: 2010 May 17 problem
Post #7 Posted: Tue May 18, 2010 10:43 am 
Dies in gote

Posts: 45
Liked others: 1
Was liked: 3
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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Offline unkx80
 Post subject: Re: 2010 May 17 problem
Post #8 Posted: Thu May 20, 2010 3:34 am 
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Rank: Dan player
I guess most people who attempted this problem would have figured out the solution by now. Thanks for the attempts!

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Offline Phelan
 Post subject: Re: 2010 May 17 problem
Post #9 Posted: Thu May 20, 2010 3:38 am 
Gosei
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GD Posts: 892
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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