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question on an avalanche variation
http://lifein19x19.com/viewtopic.php?f=15&t=14043		 Page 1 of 1
Author:  izabera [ Tue Feb 28, 2017 5:45 am ]
Post subject:  question on an avalanche variation
this move was played by kobayashi koichi
Click Here To Show Diagram Code
[go]$$c
$$ -------
$$ | . . . . . . .
$$ | . . O . . . .
$$ | . . O X X b .
$$ | . X X O O X .
$$ | . X O . . # .
$$ | . d . O a . .
$$ | . . . c . . .[/go]

i looked it up on kogo's joseki dictionary and they recommend A B or C as moves for white, clarifying that D is a game-over mistake because of the throw-in at D15
why is this not the case for B?

edit:
it even goes on to suggest this continuation
Click Here To Show Diagram Code
[go]$$Wc
$$ -------
$$ | . . . . . . .
$$ | . . O 4 . 2 .
$$ | . . O X X 1 3
$$ | . X X O O X .
$$ | . X O . . X .
$$ | . . . O . . .
$$ | . . . . . . .[/go]

i don't understand why black would ever play :b4: instead of D15
Author:  Uberdude [ Tue Feb 28, 2017 5:50 am ]
Post subject:  Re: question on an avalanche variation
It is. Kogo's has mistakes. Josekipedia.com is better (but not perfect).
Author:  salerno [ Tue Feb 28, 2017 1:24 pm ]
Post subject:  Re: question on an avalanche variation
Yes, White has to defend.

According to Takao Shinji's dictionary, this is the equal for both variation:

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