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 Post subject: question on an avalanche variation
Post #1 Posted: Tue Feb 28, 2017 5:45 am 
Beginner

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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

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 Post subject: Re: question on an avalanche variation
Post #2 Posted: Tue Feb 28, 2017 5:50 am 
Oza

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KGS: Uberdude 4d
OGS: Uberdude 7d
It is. Kogo's has mistakes. Josekipedia.com is better (but not perfect).

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 Post subject: Re: question on an avalanche variation
Post #3 Posted: Tue Feb 28, 2017 1:24 pm 
Dies in gote
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KGS: salerno
Yes, White has to defend.

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


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