Life In 19x19

Posted: **Sat Jul 21, 2012 1:59 pm**

Here's a position I botched in a recent game:

Click Here To Show Diagram Code: [go]$$Bcm1 How should black play? $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . . | $$ . . . . . . O X . . | $$ . . . . . O O O X . | $$ . . . . . . . X . . | $$ --------------------[/go]

What's the best way for black to play, and what are the followups? I think I know the answer now, but I'm curious to see others' sequences.

Posted: **Sat Jul 21, 2012 3:11 pm**

Posted: **Sat Jul 21, 2012 3:30 pm**

This looks like the vital point to me:

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . 1 | $$ . . . . . . O X . . | $$ . . . . . O O O X . | $$ . . . . . . . X . . | $$ --------------------[/go]

Posted: **Sat Jul 21, 2012 3:30 pm**

I too get that the diagonal move lives without ko or seki.

Posted: **Sat Jul 21, 2012 5:11 pm**

Yes it lives, but I don't think that way gets the most points.

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . 1 | $$ . . . . . . O X . . | $$ . . . . . O O O X . | $$ . . . . . . . B 2 . | $$ --------------------[/go]

Can you find a way to save this stone?

Posted: **Sat Jul 21, 2012 5:11 pm**

I don't think your move works Joaz:

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X 7 | $$ . . . . . . . O X . | $$ , . . . . . O X 3 1 | $$ . . . . . . O X 2 5 | $$ . . . . . O O O X 8 | $$ . . . . . . 6 X 4 . | $$ --------------------[/go]

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X 3 1 | $$ . . . . . . O X 2 6 | $$ . . . . . O O O X . | $$ . . . . . . . X 4 5 | $$ --------------------[/go]

However, I can't see anything wrong with this move to live:

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . . | $$ . . . . . . O X 1 . | $$ . . . . . O O O X . | $$ . . . . . . . X . . | $$ --------------------[/go]

Posted: **Sat Jul 21, 2012 5:32 pm**

speedchase wrote:
This looks like the only move to me, but I am not sure
$$Bcm1 How should black play?
$$ , . . . . . , . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . O O 6 |
$$ . . . . . . . O X W |
$$ . . . . . . . O X 3 |
$$ . . . . . . . O X . |
$$ , . . . . . O X 1 4 |
$$ . . . . . . O X 7 2 |
$$ . . . . . O O O X 8 |
$$ . . . . . . . X 5 . |
$$ --------------------
Click Here To Show Diagram Code
[go]$$Bcm1 How should black play? $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O 6 | $$ . . . . . . . O X W | $$ . . . . . . . O X 3 | $$ . . . . . . . O X . | $$ , . . . . . O X 1 4 | $$ . . . . . . O X 7 2 | $$ . . . . . O O O X 8 | $$ . . . . . . . X 5 . | $$ --------------------[/go]
I think it becomes seki

Posted: **Sat Jul 21, 2012 5:56 pm**

Posted: **Sat Jul 21, 2012 6:26 pm**

LocoRon wrote:
speedchase wrote:
This looks like the only move to me, but I am not sure
$$Bcm1 How should black play?
$$ , . . . . . , . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . O O 6 |
$$ . . . . . . . O X W |
$$ . . . . . . . O X 3 |
$$ . . . . . . . O X . |
$$ , . . . . . O X 1 4 |
$$ . . . . . . O X 7 2 |
$$ . . . . . O O O X 8 |
$$ . . . . . . . X 5 . |
$$ --------------------
Click Here To Show Diagram Code
[go]$$Bcm1 How should black play? $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O 6 | $$ . . . . . . . O X W | $$ . . . . . . . O X 3 | $$ . . . . . . . O X . | $$ , . . . . . O X 1 4 | $$ . . . . . . O X 7 2 | $$ . . . . . O O O X 8 | $$ . . . . . . . X 5 . | $$ --------------------[/go]
I think it becomes seki

but 4 at 8?

hidden since the original was.
$$Bcm1 If white makes the mistake of 6...
$$ , . . . . . , . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . O O 6 |
$$ . . . . . . . O X W |
$$ . . . . . . . O X 3 |
$$ . . . . . . . O X . |
$$ , . . . . . O X 1 4 |
$$ . . . . . . O X . 2 |
$$ . . . . . O O O X 7 |
$$ . . . . . . . X 5 . |
$$ --------------------
Click Here To Show Diagram Code
[go]$$Bcm1 If white makes the mistake of 6... $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O 6 | $$ . . . . . . . O X W | $$ . . . . . . . O X 3 | $$ . . . . . . . O X . | $$ , . . . . . O X 1 4 | $$ . . . . . . O X . 2 | $$ . . . . . O O O X 7 | $$ . . . . . . . X 5 . | $$ --------------------[/go]
Other than that little nitpick, I think you're right, black 1 does look like it leads to seki.

Posted: **Sat Jul 21, 2012 6:43 pm**

Is anyone else getting timeouts? It took me several tries to post.

Posted: **Sat Jul 21, 2012 8:37 pm**

Upon further reflection, this is what I would play:

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . . | $$ . . . . . . O X . . | $$ . . . . . O O O X . | $$ . . . . . . . X 1 . | $$ --------------------[/go]

Posted: **Sun Jul 22, 2012 2:17 am**

Three ways to live.

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . . | $$ . . . . . . O X . . | $$ . . . . . O O O X . | $$ . . . . . . . X 1 . | $$ --------------------[/go]

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . . | $$ . . . . . . O X 1 . | $$ . . . . . O O O X . | $$ . . . . . . . X . . | $$ --------------------[/go]

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . . | $$ . . . . . . O X . 1 | $$ . . . . . O O O X . | $$ . . . . . . . X . . | $$ --------------------[/go]

Which is best?

Edit: I had it right the first time.

Posted: **Sun Jul 22, 2012 9:09 am**

Bill Spight wrote:Three ways to live.
...

$$Bcm1
$$ , . . . . . , . . . |
$$ . . . . . . . . . . |
$$ . . . . . . . O O . |
$$ . . . . . . . O X W |
$$ . . . . . . . O X . |
$$ . . . . . . . O X . |
$$ , . . . . . O X . . |
$$ . . . . . . O X 1 . |
$$ . . . . . O O O X . |
$$ . . . . . . . X . . |
$$ --------------------
Click Here To Show Diagram Code
[go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . . | $$ . . . . . . O X 1 . | $$ . . . . . O O O X . | $$ . . . . . . . X . . | $$ --------------------[/go]
...

Maybe two?

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X 3 | $$ , . . . . . O X . 2 | $$ . . . . . . O X 1 . | $$ . . . . . O O O X . | $$ . . . . . . . X 4 . | $$ --------------------[/go]

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X 4 | $$ . . . . . . . O X 6 | $$ , . . . . . O X 5 2 | $$ . . . . . . O X 1 . | $$ . . . . . O O O X . | $$ . . . . . . . X 3 . | $$ --------------------[/go]

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X 3 2 | $$ . . . . . . O X 1 . | $$ . . . . . O O O X . | $$ . . . . . . . X 4 . | $$ --------------------[/go]

Posted: **Sun Jul 22, 2012 10:41 am**

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X 4 | $$ . . . . . . . O X . | $$ , . . . . . O X 5 2 | $$ . . . . . . O X 1 3 | $$ . . . . . O O O X . | $$ . . . . . . . X . . | $$ --------------------[/go]

Maybe three?

Posted: **Sun Jul 22, 2012 10:42 am**

What about this?

Click Here To Show Diagram Code: [go]$$Bcm1 $$ , . . . . . , . . . | $$ . . . . . . . . . . | $$ . . . . . . . O O . | $$ . . . . . . . O X W | $$ . . . . . . . O X . | $$ . . . . . . . O X . | $$ , . . . . . O X . 2 | $$ . . . . . . O X 1 3 | $$ . . . . . O O O X . | $$ . . . . . . . X . . | $$ --------------------[/go]

Life In 19x19

Best protection in endgame

Best protection in endgame

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