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Is this a good move?
http://www.lifein19x19.com/viewtopic.php?f=10&t=11502		 Page 1 of 1
Author:  macelee [ Sat Feb 21, 2015 12:37 am ]
Post subject:  Is this a good move?
Go Diagram
Click Here To Show Diagram Code
[go]$$W
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . O . . . . . , . . . |
$$ | . . . . . X . . . . . X . 1 . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


I don't quite understand the meaning of this move. But it recently appeared in professional games twice and developed into similar situation.

http://www.go4go.net/go/games/sgfview/46156/10
http://www.go4go.net/go/games/sgfview/46132/10
Author:  gaius [ Sat Feb 21, 2015 11:27 am ]
Post subject:  Re: Is this a good move?
Interesting move! I would not claim to understand every variation, but I would guess the idea is to make miai of 'a' and 'b' below
Go Diagram
Click Here To Show Diagram Code
[go]$$W
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . O . b . . . , . . . |
$$ | . . . . . X . . . . . X . O . X a . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


In the games, black defends the corner, and the result seems OK for both:
Go Diagram
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . O 8 2 3 5 1 , . . . |
$$ | . . . . . X . . . . 7 X 4 O . X . . . |
$$ | . . . . . . . . . . 9 6 . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


'a' and 'b' are white's sente later. This looks quite good for white, I would say.
Go Diagram
Click Here To Show Diagram Code
[go]$$W
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . O O O X X X , . . . |
$$ | . . . . . X . . . 3 X X O O . X . . . |
$$ | . . . . . . . . . 1 X O 2 . . . . . . |
$$ | . . . . . . . . a b . 4 . . . . . . . |
$$ +---------------------------------------+[/go]


If black does not defend the corner then I guess white will invade it. I wonder what variations will follow! Like this, maybe black 1 is overconcentrated?
Go Diagram
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . 0 . . |
$$ | . . . . . . . . . . . 1 . . . 5 . . . |
$$ | . . . O . . . . . O . . . . . 3 4 . . |
$$ | . . . . . X . . . . . X . O 9 X 2 . . |
$$ | . . . . . . . . . . . . . . 7 6 8 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


... so maybe black should hane - but what follows next?
Go Diagram
Click Here To Show Diagram Code
[go]$$W
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . X . . . . . . . |
$$ | . . . O . . . . . O . . . . . 3 2 . . |
$$ | . . . . . X . . . . . X . O . X 1 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
Author:  DrStraw [ Sat Feb 21, 2015 11:32 am ]
Post subject:  Re: Is this a good move?
I am surprised that the situation even arose. B seems very low at the bottom.
Author:  Magicwand [ Sat Feb 21, 2015 12:01 pm ]
Post subject:  Re: Is this a good move?
My first instinct says no.
after careful consideration still no.
Try to convince me and I will show you y u r wrong.
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