My thoughts:
1. I don't really like that we are pushing from behind here. That's one of the downsides of the marked move:
- Click Here To Show Diagram Code
[go]$$Bcm29
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X X . . . . . . . . . . . . |
$$ | . . O . X O O X B . . . . . . . . . . |
$$ | . . . O O O O X O O . . . . . X . . . |
$$ | . . . . O O X O . . . . . . . . . . . |
$$ | . . X . X X X . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X X . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . X , . . . |
$$ | . . . O . O . . . X . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
But anyway, that's in the past, and I think I've dwelled on that enough.
2. Given that we are here, I think our focus should be to put pressure on white's group (assuming white extends):
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O X X . . . . . . . . . . . . |
$$ | . . O . X O O X X X . . . . . . . . . |
$$ | . . . O O O O X W W W . . . . X . . . |
$$ | . . . . O O X W . . . . . . . . . . . |
$$ | . . X . X X X . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X X . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . X , . . . |
$$ | . . . O . O . . . X . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
3. I cannot think of a direct attack on the side stone at this time, since white can treat it lightly:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O X X . . . . . . . . . . . . |
$$ | . . O . X O O X X X . . . . . . . . . |
$$ | . . . O O O O X O O O . . . . X . . . |
$$ | . . . . O O X O . . . . . . . . . . . |
$$ | . . X . X X X . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . W . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X X . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . X , . . . |
$$ | . . . O . O . . . X . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
4. We eventually have to answer at the top, since white's extension is sente. Furthermore, like Joaz says, the jump doesn't really work that well:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O X X . . 4 3 . . . . . . . . |
$$ | . . O . X O O X X X 2 1 . . . . . . . |
$$ | . . . O O O O X O O O . . . . X . . . |
$$ | . . . . O O X O . . . . . . . . . . . |
$$ | . . X . X X X . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X X . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . X , . . . |
$$ | . . . O . O . . . X . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
5. So I think we should make white's group heavy, and keep pressure on it. There's not a direct way to capture it or to make a lot of profit. But we should keep it heavy.
My vote is to play the atari immediately to achieve this:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O X X . . . . . . . . . . . . |
$$ | . . O . X O O X X X 3 . . . . . . . . |
$$ | . . . O O O O X O O O . . . . X . . . |
$$ | . . . . O O X O 2 . . . . . . . . . . |
$$ | . . X . X X X 1 . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X X . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . X , . . . |
$$ | . . . O . O . . . X . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
The reason is that it gets them heavy, keeps our wall solid and without defects, allowing us to come back to the top and answer like we have to.
6. I think Joaz's idea of knight's move is good for extending our influence. But I fear that they will protect in sente (since we have to answer on the top), and then counter attack. For example:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O X X . . . . . . . . . . . . |
$$ | . . O . X O O X X X 3 . . . . . . . . |
$$ | . . . O O O O X O O O . . . . X . . . |
$$ | . . . . O O X O 2 . . . . . . . . . . |
$$ | . . X . X X X 4 . . . . . . . . . . . |
$$ | . . . . . . 6 5 1 . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . W . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X X . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . X , . . . |
$$ | . . . O . O . . . X . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
The marked move becomes relevant as a ladder breaker, and things get more complicated.
The plus side of this variation is that white's group is heavy. For example, later we have hane:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O X X . . . . . . . . . . . . |
$$ | . . O . X O O X X X X . . . . . . . . |
$$ | . . . O O O O X W W W B . . . X . . . |
$$ | . . . . O O X W W . . . . . . . . . . |
$$ | . . X . X X X W . . . . . . . . . . . |
$$ | . . . . . . O X X . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X X . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . X , . . . |
$$ | . . . O . O . . . X . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
But white's group is not captured, and who is weaker is not clear to me.
If we play the simple atari, our groups are all strong, and white is the only one with a heavy group.
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O X X . . . . . . . . . . . . |
$$ | . . O . X O O X X X X . . . . . . . . |
$$ | . . . O O O O X O O O . . . . X . . . |
$$ | . . . . O O X O O . . . . . . . . . . |
$$ | . . X . X X X X . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X X . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . X , . . . |
$$ | . . . O . O . . . X . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
7. That being said, the atari doesn't provide as much influence as Joaz's knight's move. But it leaves less weaknesses for the opponent to counter attack.