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 Post subject: Re: Yithril vs. Magicwand
Post #81 Posted: Mon Aug 27, 2012 3:34 am 
Tengen
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Hehe :)

Click Here To Show Diagram Code
[go]$$B
$$ --------------------------
$$ | . X 2 3 . . . . . . .
$$ | O O X X 4 . . . . . .
$$ | a O 1 X O . O . . . .
$$ | 5 X X O . . . . . X .
$$ | . X O O . . . . . . .
$$ | . O . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$[/go]


Even this is obviously alive, as White can't play at "a", and Black can.

EDIT: ok, an obvious ko:

Click Here To Show Diagram Code
[go]$$B
$$ --------------------------
$$ | . X 2 3 . . . . . . .
$$ | O O X X 6 . . . . . .
$$ | 7 O 1 X O . O . . . .
$$ | 4 X X O . . . . . X .
$$ | 5 X O O . . . . . . .
$$ | . O . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$[/go]


However, this is a two step approach ko, so timing is difficult. I can't see a better way for White, but there may be one (mitsun is a lot stronger than I am).

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 Post subject: Re: Yithril vs. Magicwand
Post #82 Posted: Mon Aug 27, 2012 3:47 am 
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Yeah, I can't see anything better than the approach ko either. Looks like this is Black's best option.

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 Post subject: Re: Yithril vs. Magicwand
Post #83 Posted: Mon Aug 27, 2012 5:53 am 
Tengen
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 Post subject: Re: Yithril vs. Magicwand
Post #84 Posted: Mon Aug 27, 2012 12:19 pm 
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Topazg & Intrepid
I think the problem is symmetric -- B can play either way and W gets an approach move ko. In your sequence, W does not have to prevent B from playing (a) or throw-in to force B to play (a).

Click Here To Show Diagram Code
[go]$$W
$$ --------------------------
$$ | . 4 . a . . . . . . .
$$ | 5 1 2 X . . . . . . .
$$ | . 3 6 X O . O . . . .
$$ | . X X O . . . . . X .
$$ | . X O O . . . . . . .
$$ | . O . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$[/go]


Click Here To Show Diagram Code
[go]$$W
$$ --------------------------
$$ | . X . 2 5 . . . . . .
$$ | O O X X 1 . . . . . .
$$ | . O X X O . O . . . .
$$ | 3 X X O . . . . . X .
$$ | 4 X O O . . . . . . .
$$ | . O . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$[/go]

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