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I tried to solve this tsumego, black is on the move:

enter image description here

it seems to me that white can kill black only if he wins the ko two times. Is that correct? After first ko win he will connect at 1-3 and after second win he will take at 3-2.

2 Answers 2

5

Black lives:

$$B 
$$ -------------------
$$ | . 1 . . X O . . .
$$ | O X . X X O . . .
$$ | . X X O O O . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .

White kills unconditionally:

$$W 
$$ -------------------
$$ | . 2 1 . X O . . .
$$ | O X . X X O . . .
$$ | 3 X X O O O . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .

This doesn't work for Black, either.

$$W 
$$ -------------------
$$ | . . 1 . X O . . .
$$ | O X 3 X X O . . .
$$ | 2 X X O O O . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
1
  • OK thanks, I didn't see the "black lives" sequence. I was only reading the sequence when black starts at 3-1 (right next to your "1"). I don't know why I missed this one.
    – Tomas
    Feb 10, 2015 at 15:45
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I think black should play 2-1 then 3-1 and 1-3 are miai for b life, no need for ko

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