Hi, I just lost a game by 0,5 points because I could not figure this out in the 20 seconds that I had. Even after looking now I can only ever get kos, but I feel like the corner should be alive unconditional(maybe I read it somewhere).
Any help highly appreciated.
$$B B to play
$$ ------------------
$$ | . . X O . . . . .
$$ | . . X O . . . . .
$$ | O . X O . . . . .
$$ | . X X O . . . . .
$$ | X X O O . . . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
[go]$$B B to play
$$ ------------------
$$ | . . X O . . . . .
$$ | . . X O . . . . .
$$ | O . X O . . . . .
$$ | . X X O . . . . .
$$ | X X O O . . . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]
Re: Alive or just Ko
Posted: Tue Nov 26, 2013 2:26 pm
by Kirby
Just ko
Re: Alive or just Ko
Posted: Tue Nov 26, 2013 2:30 pm
by paK0
Thanks, gonna go sue Janice Kim now for writing that all 7+ eyeshapes are alive x.X
Re: Alive or just Ko
Posted: Tue Nov 26, 2013 2:32 pm
by leichtloeslich
It's ko. However, if you had a few more outside liberties it would be alive. Can you figure out the minimum number of outside liberties required for unconditional life?
paK0 wrote:gonna go sue Janice Kim now for writing that all 7+ eyeshapes are alive
Liberties matter (as do cuts).
Re: Alive or just Ko
Posted: Tue Nov 26, 2013 2:47 pm
by Dusk Eagle
paK0 wrote:Thanks, gonna go sue Janice Kim now for writing that all 7+ eyeshapes are alive x.X
She almost certainly meant in the center of the board, without any cuts in the inside shape. Being on the corner or the side of the board can really change things.
Re: Alive or just Ko
Posted: Tue Nov 26, 2013 2:57 pm
by paK0
leichtloeslich wrote:It's ko. However, if you had a few more outside liberties it would be alive. Can you figure out the minimum number of outside liberties required for unconditional life?
Considering the fact that I just tried 15 minutes and can still not make living shape even disregarding outside liberties - no =)
Re: Alive or just Ko
Posted: Tue Nov 26, 2013 3:13 pm
by DrStraw
Looks alive in mannen ko to me. While not technically 100% alive it is as good as alive in practice.
$$B B to play
$$ ------------------
$$ | 3 . X O . . . . .
$$ | 2 1 X O . . . . .
$$ | O . X O . . . . .
$$ | . X X O . . . . .
$$ | X X O O . . . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
[go]$$B B to play
$$ ------------------
$$ | . . X O . . . . .
$$ | . . X O . . . . .
$$ | O . X O . . . . .
$$ | . X X O . . . . .
$$ | X X O O . . . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]
Of course it's nice to be able to solve the life and death problem, but another skill is to ask: how did I get in this situation to begin with? I would like to see the actual game sequence, but if it was possible to play the following shape instead...wouldn't it be happier? But be careful...read what white can do.
$$W status?
$$ ------------------
$$ | . . X O . . . . .
$$ | . . X O . . . . .
$$ | X . X O . . . . .
$$ | . . X O . . . . .
$$ | X X O O . . . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
above is not even required, so it is also sente for black.