$$B Black to move
$$ ---------------------------------------
$$ . . . . . . . O . . . . .
$$ . . . X . . . . O X . . .
$$ . . X . X O O O X . . . .
$$ . . . . X O . O X . X . .
$$ . . . . X O O O X . . . .
$$ . . . . . X X X . . . . .
$$ . . . . . . . . . . . . .
[go]$$B Black to move
$$ ---------------------------------------
$$ . . . . . . . O . . . . .
$$ . . . X . . . . O X . . .
$$ . . X . X O O O X . . . .
$$ . . . . X O . O X . X . .
$$ . . . . X O O O X . . . .
$$ . . . . . X X X . . . . .
$$ . . . . . . . . . . . . .[/go]
While at first glance it looked alive I read a ko. Hope I didn't miss some sequence which makes white live
Re: SDK problem from KGS
Posted: Thu Nov 18, 2010 2:52 pm
by daniel_the_smith
Hidden from those who want to treat it as a status problem:
Unless I'm mistaken, white is unconditionally dead if black moves first.
IOW Li Kao missed some things ^^
Re: SDK problem from KGS
Posted: Thu Nov 18, 2010 2:58 pm
by Li Kao
daniel_the_smith wrote:Unless I'm mistaken, white is unconditionally dead if black moves first.
I didn't read very careful for black since I was happy to find at least a ko. Some other observers thought it had a real eye there, so I read mainly to disprove life. Guess I need to read again for black^^
Re: SDK problem from KGS
Posted: Thu Nov 18, 2010 11:24 pm
by illluck
I must be missing something too, because I also read it as ko.
Re: SDK problem from KGS
Posted: Thu Nov 18, 2010 11:36 pm
by Sverre
I also read out a ko. I can't find a way for Black to kill unconditionally.
$$B I believe this B1 fails, 5 and 6 are miai
$$ ---------------------------------------
$$ . . . . 4 1 . O 6 3 . . .
$$ . . . X 5 2 . . O X . . .
$$ . . X . X O O O X . . . .
$$ . . . . X O . O X . X . .
$$ . . . . X O O O X . . . .
$$ . . . . . X X X . . . . .
$$ . . . . . . . . . . . . .
[go]$$B I believe this B1 fails, 5 and 6 are miai
$$ ---------------------------------------
$$ . . . . 4 1 . O 6 3 . . .
$$ . . . X 5 2 . . O X . . .
$$ . . X . X O O O X . . . .
$$ . . . . X O . O X . X . .
$$ . . . . X O O O X . . . .
$$ . . . . . X X X . . . . .
$$ . . . . . . . . . . . . .[/go]
$$B B1 and a are both defeated easily.
$$ ---------------------------------------
$$ . . . . 1 . . O . . . . .
$$ . . . X . a 2 . O X . . .
$$ . . X . X O O O X . . . .
$$ . . . . X O . O X . X . .
$$ . . . . X O O O X . . . .
$$ . . . . . X X X . . . . .
$$ . . . . . . . . . . . . .
[go]$$B B1 and a are both defeated easily.
$$ ---------------------------------------
$$ . . . . 1 . . O . . . . .
$$ . . . X . a 2 . O X . . .
$$ . . X . X O O O X . . . .
$$ . . . . X O . O X . X . .
$$ . . . . X O O O X . . . .
$$ . . . . . X X X . . . . .
$$ . . . . . . . . . . . . .[/go]
That leaves only this .
$$B Doesn't white make ko here?
$$ ---------------------------------------
$$ . . . . . 2 . O 3 1 . . .
$$ . . . X . . 4 . O X . . .
$$ . . X . X O O O X . . . .
$$ . . . . X O . O X . X . .
$$ . . . . X O O O X . . . .
$$ . . . . . X X X . . . . .
$$ . . . . . . . . . . . . .
[go]$$B Doesn't white make ko here?
$$ ---------------------------------------
$$ . . . . . 2 . O 3 1 . . .
$$ . . . X . . 4 . O X . . .
$$ . . X . X O O O X . . . .
$$ . . . . X O . O X . X . .
$$ . . . . X O O O X . . . .
$$ . . . . . X X X . . . . .
$$ . . . . . . . . . . . . .[/go]
Re: SDK problem from KGS
Posted: Fri Nov 19, 2010 3:06 am
by Koroviev
Tried hard on this and can't find a move for black that gets better than a ko?
.
