[Computer-go] Tactical position

Christian Nentwich christian.nentwich at gmail.com
Sat Aug 28 02:52:14 PDT 2010


Brian,

I'm not sure if I'm going cross-eyed looking at your position, but if C2
initially then I think the white capture at D3 works. Whatever black does
next at the top, white plays H2 and should win?

Christian

On 28 August 2010 04:10, Brian Sheppard <sheppardco at aol.com> wrote:

> Here is the position again:
>
>  1 2 3 4 5 6 7 8 9
> A - - - - X - - - -
> B - - - O X - O O -
> C - - - O X - O X O
> D - X - O X X O X -
> E - O X O X O X - X
> F - - O - X O X X X
> G - - - - X O O O O
> H - - - X X X O - -
> J - - - - - O O - -
> X to play
>
> It turns out that the right-hand side is a tough problem for O
> after X's toughest attack, which I think is C2!
>
> I have a best-play sequence:
>
> X C2
> O B2
> X F2
> O D3
> X E1
> O G2
> X E3
> O H3
> X E2
> O F4
> X B3
> O A3
> X C3
> O A4
> X J2
> O C1
> X G1
> O H1
> X A2
> O A1
> X J3
> O G4
> X H2
> O F1 atari
>
>  1 2 3 4 5 6 7 8 9
> A O - O O X - - - -
> B - O X O X - O O -
> C O X X O X - O X O
> D - X O O X X O X -
> E X X X O X O X - X
> F O X O O X O X X X
> G - O - O X O O O O
> H O X O X X X O - -
> J - X X - - O O - -
>
> But note an interesting thing here: O is winning on the left by just
> one tempo, and there is a Ko. Since O is also winning on the right
> by just one tempo, if he needs a ko to win the left, then he will
> lose the game.
>
> Is it possible that X wins here?
>
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