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Life/death corner
Posted: Thu Jun 17, 2010 11:11 am
by Numsgil
$$Bc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O . X X O O |
$$ . . X O O . . . X X |
$$ . . . . . . . . . . |
$$ --------------------+
- Click Here To Show Diagram Code
[go]$$Bc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O . X X O O |
$$ . . X O O . . . X X |
$$ . . . . . . . . . . |
$$ --------------------+[/go]
Black to move. Is this black corner dead (or at least, it needs to capture that white group to live)? Everything I try seems refutable with a bit of thought for white's response.
eg:
$$Bc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O 8 X X O O |
$$ . . X O O 5 4 7 X X |
$$ . . . . . 6 1 2 3 . |
$$ --------------------+
- Click Here To Show Diagram Code
[go]$$Bc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O 8 X X O O |
$$ . . X O O 5 4 7 X X |
$$ . . . . . 6 1 2 3 . |
$$ --------------------+[/go]
Re: Life/death corner
Posted: Thu Jun 17, 2010 11:49 am
by daniel_the_smith
Locally, that is dead.
Re: Life/death corner
Posted: Thu Jun 17, 2010 12:10 pm
by DeadTired
daniel_the_smith wrote:Locally, that is dead.
Have you considered starting at p2?
Re: Life/death corner
Posted: Thu Jun 17, 2010 12:16 pm
by daniel_the_smith
DeadTired wrote:daniel_the_smith wrote:Locally, that is dead.
Have you considered starting at p2?
Yes, but I misread it.
Seems it should be seki.
Re: Life/death corner
Posted: Thu Jun 17, 2010 12:21 pm
by DeadTired
daniel_the_smith wrote:DeadTired wrote:daniel_the_smith wrote:Locally, that is dead.
Have you considered starting at p2?
Yes, but I misread it.
Seems it should be seki.
There also seems to be this ko:
Re: Life/death corner
Posted: Thu Jun 17, 2010 12:26 pm
by daniel_the_smith
Ah, yeah, you're right... misread yet again! Too much stuff going on today...
Re: Life/death corner
Posted: Thu Jun 17, 2010 1:15 pm
by Numsgil
DeadTired wrote:There also seems to be this ko:
I don't think that works because of this:
edit: ah actually, this would be a seki:
Re: Life/death corner
Posted: Thu Jun 17, 2010 3:39 pm
by Dusk Eagle
Please show me how P2 helps at all:
$$Wc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O . X X O O |
$$ . . X O O X . . X X |
$$ . . . . . . 1 . . . |
$$ --------------------+
- Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O . X X O O |
$$ . . X O O X . . X X |
$$ . . . . . . 1 . . . |
$$ --------------------+[/go]
It looks dead easily to me.
Re: Life/death corner
Posted: Thu Jun 17, 2010 3:45 pm
by prokofiev
Dusk Eagle wrote:Please show me how P2 helps at all:
$$Wc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O . X X O O |
$$ . . X O O X . . X X |
$$ . . . . . . 1 . . . |
$$ --------------------+
- Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O . X X O O |
$$ . . X O O X . . X X |
$$ . . . . . . 1 . . . |
$$ --------------------+[/go]
It looks dead easily to me.
My reading:
$$Wc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O . X X O O |
$$ . . X O O X . c X X |
$$ . . . . . 2 1 a b . |
$$ --------------------+
- Click Here To Show Diagram Code
[go]$$Wc
$$ . . . . . . . . . . |
$$ , . . . X . , O . . |
$$ . . . . X O O . . . |
$$ . . . . X X X O . . |
$$ . . . . . X O O . . |
$$ . . . O O O X . O . |
$$ . . . X O . . X O O |
$$ , X . X O . X . X O |
$$ X . . X O . X X O O |
$$ . . X O O X . c X X |
$$ . . . . . 2 1 a b . |
$$ --------------------+[/go]
Now a,b give seki. White c lets black live with points (black b).
Re: Life/death corner
Posted: Thu Jun 17, 2010 3:52 pm
by Dusk Eagle
Oh yeah
. I saw
followed by b, but not black's follow-up at 'c' rather than 'a'. I guess I'm desperately out of shape with my tsumego...
Re: Life/death corner
Posted: Thu Jun 17, 2010 3:54 pm
by Numsgil
Glad to see this is tricky enough to give others trouble too
