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2010 May 17 problem
http://www.lifein19x19.com/viewtopic.php?f=15&t=552		 Page 1 of 1
Author:  unkx80 [ Sun May 16, 2010 11:52 am ]
Post subject:  2010 May 17 problem
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]
Author:  SoDesuNe [ Sun May 16, 2010 12:08 pm ]
Post subject:  Re: 2010 May 17 problem
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]
Author:  tapir [ Sun May 16, 2010 1:47 pm ]
Post subject:  Re: 2010 May 17 problem
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.
Author:  topazg [ Sun May 16, 2010 1:54 pm ]
Post subject:  Re: 2010 May 17 problem
@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?
Author:  Magicwand [ Sun May 16, 2010 1:56 pm ]
Post subject:  Re: 2010 May 17 problem
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]
Author:  SoDesuNe [ Mon May 17, 2010 1:19 am ]
Post subject:  Re: 2010 May 17 problem
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.
Author:  Biondy [ Tue May 18, 2010 10:43 am ]
Post subject:  Re: 2010 May 17 problem
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]
Author:  unkx80 [ Thu May 20, 2010 3:34 am ]
Post subject:  Re: 2010 May 17 problem
I guess most people who attempted this problem would have figured out the solution by now. Thanks for the attempts!
Author:  Phelan [ Thu May 20, 2010 3:38 am ]
Post subject:  Re: 2010 May 17 problem
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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