Life In 19x19
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Lost on move 53
http://www.lifein19x19.com/viewtopic.php?f=4&t=3126		 Page 1 of 1
Author:  Phelan [ Thu Feb 03, 2011 2:39 pm ]
Post subject:  Lost on move 53
I felt completely outplayed on this one.
I was Black.
I think it was move 53 that lost the game, since letting him live big made me too fragile. Is this true, or were other plays worse?
Author:  daniel_the_smith [ Thu Feb 03, 2011 2:53 pm ]
Post subject:  Re: Lost on move 53
Yeah, 53 is pretty bad.

It isn't even necessary to kill the group, locally white can only get one eye. Sensei's library somewhere lists the term "pommern" as meaning "to kill a dead group". I think that's what you did here...
Author:  ZeroKun [ Thu Feb 03, 2011 2:56 pm ]
Post subject:  Re: Lost on move 53
Usually I don't reply to these threads, but you should have done a geta to save those stones, if white played your move or around it, T9 removes the eye, you also have Q12.
Author:  judicata [ Thu Feb 03, 2011 3:08 pm ]
Post subject:  Re: Lost on move 53
I'm around your strength, so this is just FWIW:


11 - Maybe the wrong side, but I don't think it is a game-changer since you have stones at R9 and Q16 (anyone disagree?), and white gets a bit larger corner if you block at Q3. Just IMO.

That said, in your variation I don't think white's block at Q6 is good because black can push and cut. White normally plays at S6 instead I think. Maybe this is different with the two-space pincer.
Author:  EdLee [ Thu Feb 03, 2011 6:30 pm ]
Post subject: 
A few ideas.
Author:  gaius [ Fri Feb 04, 2011 3:48 am ]
Post subject:  Re: Lost on move 53
There's an interesting tsumego in the top right corner, that might interest other players also. The question: black to kill unconditionally

Click Here To Show Diagram Code
[go]$$c Real-game tsumego
$$ ------------
$$ . . . . . . |
$$ . X O O . . |
$$ O X X O . . |
$$ . . X . . . |
$$ . . . . O . |
$$ . . X X O . |
$$ . . . X X X |
$$ . . . . . . |[/go]


The answer:
It's an elegant throw-in:
Click Here To Show Diagram Code
[go]$$Bc The Kill, part 1
$$ ------------
$$ . . . . . . |
$$ . X O O . 5 |
$$ O X X O 6 . |
$$ . . X 2 1 4 |
$$ . . . 3 O . |
$$ . . X X O . |
$$ . . . X X X |
$$ . . . . . . |[/go]

Click Here To Show Diagram Code
[go]$$Bc The Kill, part 2
$$ ------------
$$ . . . . . . |
$$ . X O O . X |
$$ O X X O O b |
$$ . . X O . O |
$$ . . . X O a |
$$ . . X X O 7 |
$$ . . . X X X |
$$ . . . . . . |[/go]

... making 'a' and 'b' miai.

If white gives the other atari, the same sequence is basically the same:
Click Here To Show Diagram Code
[go]$$Bc Variation
$$ ------------
$$ . . . . . . |
$$ . X O O . 5 |
$$ O X X O 4 . |
$$ . . X 2 1 6 |
$$ . . . 3 O . |
$$ . . X X O 7 |
$$ . . . X X X |
$$ . . . . . . |[/go]


This position is derived from a very common joseki that results from a 3-3 invasion. In the position below, 'a' is sente; otherwise you can initiate the kill with the cut at 'b' and the resulting squeeze shown above. It's a nice way to test your opponents tsumego :twisted:
Click Here To Show Diagram Code
[go]$$c Joseki
$$ ------------
$$ . . . . . . |
$$ . X O O . . |
$$ X . X O . . |
$$ . . X O b . |
$$ . . . X O . |
$$ . . . X O . |
$$ . . . X X a |
$$ . . . . . . |[/go]

My estimated level would be about 4k-2d, so no worries that you missed it. The tsumego is just too nice to resist posting though :)
Author:  Phelan [ Fri Feb 04, 2011 2:16 pm ]
Post subject:  Re: Lost on move 53
Thank you all!

I missed a lot of things in this one. :S
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