This is a position from a book I'm studying. So far all the positions have come from natural/common situations and joseki deviations, but I'm not sure where this one comes from.

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[go]$$Bm1 Unknown diagram
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . O O . . . . . . . .
$$ | . X X O . . . . . . .
$$ | . O O X X . . . . . .
$$ | . . X O . . . . . , .
$$ | . . X O . X . . . . .
$$ | . . X O . O X . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

My best guess for how part of the diagram come about is this:

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[go]$$Wm1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . 6 9 . . . . . . .
$$ | . 7 5 8 0 . . . . . .
$$ | . . 4 1 . . . . . , .
$$ | . . 2 3 . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

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[go]$$Wm11 Cont. 1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . 3 1 . . . . . . . .
$$ | . 2 X O . . . . . . .
$$ | . O O X X . . . . . .
$$ | . . X O . . . . . , .
$$ | . . X O . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

I'm not sure how the others got there, except this is the result:

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[go]$$Bm11 Cont. 1
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . O O . . . . . . . .
$$ | . X X O . . . . . . .
$$ | . O O X X . . . . . .
$$ | . . X O . . . . . , .
$$ | . . X O . 1 . . . . .
$$ | . . Y Q . 2 3 . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

BTW, the problem goes on the say that White continues with when she should have played A first. The question is, how does Black punish?

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[go]$$Bm1 Problem
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . O O . . . . . . . .
$$ | . X X O . . . . . . .
$$ | . O O X X . . . . . .
$$ | . Q X O . . . . . , .
$$ | . . X O . X . . . . .
$$ | . . X O a O X . . . .
$$ | . . . . . . . . . . .
$$ ----------------------[/go]

Answer:

my guess

_________________
Wait, please.

MJK's line looks like a good guess. In GoGoD we do not see any games where this position occurs. My copy of the Igo Daijiten contains a couple of diagrams on the continuation when Black plays the atari at 8 in MJK's diagram. All the lines continue with Black 14 at 15 so we never arrive at the position shown. In actual play, as demonstrated by GoGoD, Black usually plays 8 at 15. On occasion Black plays 8 at 12 instead. There are 24 games with these two lines, played between 1927 and 2011.

_________________
Dave Sigaty
"Short-lived are both the praiser and the praised, and rememberer and the remembered..."
- Marcus Aurelius; Meditations, VIII 21

That looks reasonable -- although I think it's still a strange sequence -- thank-you.