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In a game my opponent derived from the joseki line I was familiar with.

$$W Actual game
$$ ------------
$$ -...........
$$ -.94........
$$ -.5128O.....
$$ -..X36...0,.
$$ -...7.......
$$ -...........
$$ -...........

Instead of B10, I expected this exchange first:

$$B Expected
$$ ------------
$$ -...........
$$ -.OX........
$$ -.OOXXO.....
$$ -..XOX1..3,.
$$ -...O.......
$$ -...........
$$ -...2.......

The result here appears to be even to me, white is a little better locally but she played first so it is to be expected.

Since black omitted the 1-2 exchange and played 3 directly, he seems to plan on letting the sole white stone die on a larger scale. Consequently it appears natural to use this stone to punish black's deviation.

I've got three basic ideas how to:

  1. Tenuki and leave the bad aji. Omitting W2 as a securing move should be fine since black can't fight properly without swallowing the sole white stone first.

  2. Play W2 regardless. Then black has 2 options: play B1 so it reverts to the known pattern, or tenuki - in that case white can move her stone out easily and fight, so black probably won't do that. However, since B3 is not joseki as far as I know, this would be too easy on black.

  3. Move W2 out, splitting black's stones.

I'm thinking of either this attachment:

$$W Attachment and keima
$$ ------------
$$ -...........
$$ -.OX........
$$ -.OOXXO.....
$$ -..XOX..1X,.
$$ -...O....2..
$$ -.....3.....

or this shape:

$$W Attachment and sake bottle shape
$$ ------------
$$ -...........
$$ -.OX........
$$ -.OOXXO.12..
$$ -..XOX...X,.
$$ -...O..3....
$$ -...........

Option 3 seems to induce black to make white's left side group stronger, but at the same time, black's top stone gets stronger as well.

Is any of my ideas here reasonable? Or is black's "deviation" in fact a joseki, too?

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2 Answers 2

up vote 2 down vote accepted

W1 seems like a good move to me. B can't get a rhythm to fight well even if he ignores it to make something happen. I may be wrong but B's deviation looks like a gross overplay to me. I can't see W playing a "solid be get better result" so starting a fight seems good for W.

The only other option I can think of, other than W1, is the 5th line shoulder hit which is worth thinking about. It's much harder to control and more easily ignored though.

$$W 5th line shoulder hit
$$ ------------
$$ -...........
$$ -.OX........
$$ -.OOXXO.....
$$ -..XOX...X,.
$$ -...O...1...
$$ -...........
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Welcome to B&CG! –  Pat Ludwig Jan 7 '12 at 6:03
    
The shoulder hit seems to lead to pretty complicated fighting and several semeai possibilities on the edge. Just as you said, really difficult to judge. I guess if black were to just push and connect by clamp it would be too submissive. –  mafutrct Jan 18 '12 at 18:06
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The attachment is fine but B will resist in a different way, I guess (maybe pushing?).

$$W Attachment, black resists
$$ ------------
$$ -...........
$$ -.OX........
$$ -.OOXXO.....
$$ -..XOX..1X,.
$$ -...O2......
$$ -...34......
$$ -...........

In the (expected) variation move 2 shouldn't be a jump, rather a nobi (extension) to get a more solid shape, then I agree that W is better.

$$B Expected, stronger shape
$$ ------------
$$ -...........
$$ -.OX........
$$ -.OOXXO.....
$$ -..XOX1..3,.
$$ -...O.......
$$ -...2.......
$$ -...........
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Welcome to B&CG! –  Pat Ludwig Jan 7 '12 at 6:03
    
Not sure if the second diagram I added actually is what you meant. Looks a litte funny to me. –  mafutrct Jan 18 '12 at 18:14
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