My first inclination was to run out with a move like 1. The problem is that he then replies with 2. Now 'a' and 'b' are starting to look weak:
$$Wc
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . O . . . O O . |
$$ | . . . . . O . . . O . O X O O O X X . |
$$ | . . X X O . . . . , . . . X O X . X . |
$$ | . . X O . O . . . X . O . X O X X . . |
$$ | . . X X O O . . . . . . . X X O X X . |
$$ | . . O O X O . . X X . X . . . O O . . |
$$ | . . O X X . . . a O O b . O . . . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . O O . . . . |
$$ | . . . . . . . . . . . 2 O . . O X X . |
$$ | . . . . . X . . . . . . X O O X . O . |
$$ | . . . X . . . . . 1 . X . X O . . . . |
$$ | . . . . . O . . . . . . X X O . X . . |
$$ | . . . X . . . . . , . . . . O , X . . |
$$ | . . . . . O . . . O . X . . . . O X . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -------------------------------------
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[go]$$Wc
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . O . . . O O . |
$$ | . . . . . O . . . O . O X O O O X X . |
$$ | . . X X O . . . . , . . . X O X . X . |
$$ | . . X O . O . . . X . O . X O X X . . |
$$ | . . X X O O . . . . . . . X X O X X . |
$$ | . . O O X O . . X X . X . . . O O . . |
$$ | . . O X X . . . a O O b . O . . . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . O O . . . . |
$$ | . . . . . . . . . . . 2 O . . O X X . |
$$ | . . . . . X . . . . . . X O O X . O . |
$$ | . . . X . . . . . 1 . X . X O . . . . |
$$ | . . . . . O . . . . . . X X O . X . . |
$$ | . . . X . . . . . , . . . . O , X . . |
$$ | . . . . . O . . . O . X . . . . O X . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -------------------------------------[/go]
...so I have to reply with 3. He will play 4 without thinking twice. I probably will have to play 5 so that he does not. He will not miss the natural move at 6.
$$Wc
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . O . . . O O . |
$$ | . . . . . O . . . O . O X O O O X X . |
$$ | . . X X O . . . . , . . . X O X . X . |
$$ | . . X O . O . . . X . O . X O X X . . |
$$ | . . X X O O . . . . . . . X X O X X . |
$$ | . . O O X O . . X X . X . . . O O . . |
$$ | . . O X X . . . a O O b . O . . . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . 5 3 . O O . . . . |
$$ | . . . . . . . . . 6 4 2 O . . O X X . |
$$ | . . . . . X . . . . . . X O O X . O . |
$$ | . . . X . . . . . 1 . X . X O . . . . |
$$ | . . . . . O . . . . . . X X O . X . . |
$$ | . . . X . . . . . , . . . . O , X . . |
$$ | . . . . . O . . . O . X . . . . O X . |
$$ | . . . X . . . . . . . c . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
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[go]$$Wc
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . O . . . O O . |
$$ | . . . . . O . . . O . O X O O O X X . |
$$ | . . X X O . . . . , . . . X O X . X . |
$$ | . . X O . O . . . X . O . X O X X . . |
$$ | . . X X O O . . . . . . . X X O X X . |
$$ | . . O O X O . . X X . X . . . O O . . |
$$ | . . O X X . . . a O O b . O . . . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . 5 3 . O O . . . . |
$$ | . . . . . . . . . 6 4 2 O . . O X X . |
$$ | . . . . . X . . . . . . X O O X . O . |
$$ | . . . X . . . . . 1 . X . X O . . . . |
$$ | . . . . . O . . . . . . X X O . X . . |
$$ | . . . X . . . . . , . . . . O , X . . |
$$ | . . . . . O . . . O . X . . . . O X . |
$$ | . . . X . . . . . . . c . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -------------------------------------[/go]
At this point I am in serious trouble on the lower side. I can almost certainly live in gote starting with 'c', but then 'a' is still a boatload of bad aji.
Looking at that and similar positions, I come to the conclusion that my upper side is not absolutely safe, and that I must prevent M8.
So I'm going to come in from the top, securing my northern territory, and sacrifice K3. ( It still has some aji left, especially if the play in the lower right corner results in me getting 'd' or 'e' )
$$Wcm91 Prisoners captured: :w2: :b3:
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . O . . . O O . |
$$ | . . . . . O . . . O . O X O O O X X . |
$$ | . . X X O . . . . , . . . X O X . X . |
$$ | . . X O . O . . . X . O . X O X X . . |
$$ | . . X X O O . . . . . . . X X O X X . |
$$ | . . O O X O . . X X . X . . . O O . . |
$$ | . . O X X . . . a O O b . O . . . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . O O . . . . |
$$ | . . . i . i . . . . . . O . . O X X . |
$$ | . . . . . X . . h h 1 . X O O X . O . |
$$ | . . . X . . . . . . f X . X O . . . . |
$$ | . . . . . O . . . g . . X X O . X . . |
$$ | . . . X . . . . . , . . . . O , X . . |
$$ | . . . . . O . . . O . X . . d . O X . |
$$ | . . . X . . . . . . . c . . e . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -------------------------------------
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[go]$$Wcm91 Prisoners captured: :w2: :b3:
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . O . . . O O . |
$$ | . . . . . O . . . O . O X O O O X X . |
$$ | . . X X O . . . . , . . . X O X . X . |
$$ | . . X O . O . . . X . O . X O X X . . |
$$ | . . X X O O . . . . . . . X X O X X . |
$$ | . . O O X O . . X X . X . . . O O . . |
$$ | . . O X X . . . a O O b . O . . . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . O O . . . . |
$$ | . . . i . i . . . . . . O . . O X X . |
$$ | . . . . . X . . h h 1 . X O O X . O . |
$$ | . . . X . . . . . . f X . X O . . . . |
$$ | . . . . . O . . . g . . X X O . X . . |
$$ | . . . X . . . . . , . . . . O , X . . |
$$ | . . . . . O . . . O . X . . d . O X . |
$$ | . . . X . . . . . . . c . . e . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -------------------------------------[/go]
He has little choice but to push westward with something like 'f' or 'g'. I'll expand westward also from 1, playing something around 'h'. He will swallow K3, and I'll try to connect to E5. If I can, I'll get more in the center than he gets on the lower side. If I can't connect, and get deflected northward as I push westward, I can get a rather deep invasion around 'i', plus a big center.