<p>Black lives:</p>

<pre><code>$$B 
$$ -------------------
$$ | . 1 . . X O . . .
$$ | O X . X X O . . .
$$ | . X X O O O . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
</code></pre>

<p>White kills unconditionally:</p>

<pre><code>$$W 
$$ -------------------
$$ | . 2 1 . X O . . .
$$ | O X . X X O . . .
$$ | 3 X X O O O . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
</code></pre>

<p>This doesn't work for Black, either.</p>

<pre><code>$$W 
$$ -------------------
$$ | . . 1 . X O . . .
$$ | O X 3 X X O . . .
$$ | 2 X X O O O . . .
$$ | O O O . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
</code></pre>

CC BY-SA 3.0
2015-02-10T15:45:36.133Z
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
CC BY-SA 3.0
2015-02-10T11:23:16.367Z
2015-02-10T11:23:16.367Z
TimK
<p>I think black should play 2-1 then 3-1 and 1-3 are miai for b life, no need for ko</p>

CC BY-SA 3.0
2015-02-10T10:48:52.537Z
2015-02-10T10:48:52.537Z
kruczy
<p>I tried to solve this tsumego, black is on the move:</p>

<p><img src="https://i.sstatic.net/ycpKQ.png" alt="enter image description here"></p>

<p>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.</p>

<go><tsumego>
Tsumego elementary problem 157
Tomas
# Tsumego elementary problem 157

(Asked by: username_0 on 2015-02-09)

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

![enter image description here](https://i.sstatic.net/ycpKQ.png)

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.

**Tags:** go, tsumego


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## 2 answers

### Answer by username_1 on 2015-02-10. Score: 5 | Accepted answer

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 . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .

```

> **Comments:**
> **username_0**: 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.  

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### Answer by username_2 on 2015-02-10. Score: 3

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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