Tami wrote:
I liked both Frederik and the Guru's suggestions a lot, but may I throw in a completely different idea?
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . O . . . . O . . . . O . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . B . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . 1 . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O , X X . . . X . . . . . X . . . |
$$ | . . . O O X . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
This move seems to press down from the widest area possible, and offers support to the marked black stone. The drawback to it would be that it's not sente, but is its size enough?
Interesting question Tami. Like flOvermind, I briefly considered this move, but dismissed it because it felt wrong. I know it's not particularly helpful when people come and tell you it's all about feeling, so I'll try to explain in more detail. I think it's mostly about timing. It's partly also that I don't think the left side is interesting, because there's not so much potential there. I understand that you're thinking more about the centre though.
Firstly, a small detour. Any pressing move like

below results in an exchange of territory for influence (obvious maybe, but important):
- Click Here To Show Diagram Code
[go]$$B An even exchange?
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O 2 . 4 . . . . . . . . . . . . |
$$ | . . . . 1 3 . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
Is the exchange even? White has gained a certain amount of profit, while black has potential. I know "it's joseki" but black's potential could end up being worth more or less than white's profit depending on the whole board context and the subsequent play. And black's return on investment doesn't have to be local, so it's quite complicated of course,
If you play this way as black at the very beginning of the game, it's not necessarily 'bad', but you are making an investment with an uncertain return. Some people call that gambling. Some people play like this as part of their style, and that's fine. Other people prefer not to because it takes the subtlety and flexibility out of the position and locks you into a particular kind of game. Black now feels compelled to justify his previous moves and that limits his strategic freedom quite a bit. (Speaking personally, I experimented with this kind of power based style quite a bit, but I don't play that way anymore. I prefer the flexible approach now.)
So coming back to Kirby's game, you have to think about the value of the stones you're placing in the centre in exchange for giving white territory. I think white should respond like this:
- Click Here To Show Diagram Code
[go]$$Bcm1 White takes profit
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . O . . . . O . . . . O . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . B . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 4 . . . . . . . . . . . . . . . . |
$$ | . . . 1 . . . . . . . . . . . . . . . |
$$ | . . O 2 3 . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O , X X . . . X . . . . . X . . . |
$$ | . . . O O X . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
After white

, white has taken more territory and the potential of black's marked stone in the top left has been further reduced. Black has gained some potential in the centre though. Do you feel that it's enough?
Black

is sente by the way. Not because it threatens to attack white in any way, but because black can easily create a lot of potential on the left side if black plays another move. Like this:
- Click Here To Show Diagram Code
[go]$$Bcm1 Black's marked stone becomes an excellent move
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . O . . . . O . . . . O . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . B . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 3 1 . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . 2 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O , X X . . . X . . . . . X . . . |
$$ | . . . O O X . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
I also don't think there's any value in white trying to resist by cutting here. The large scale position in this part of the board greatly favours black if white cuts. So if white cuts there needs to be a very sharp tactical sequence that quickly settles things locally. If the fight expands, then white's cutting stones will just become a heavy group. The likely result is that cutting will help black take territory on the left side and the bottom.
- Click Here To Show Diagram Code
[go]$$Bcm1 Fighting greatly favours black on a large scale (note black has 'a' at any time)
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . O . . . . O . . . . O . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . B . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . d . . . |
$$ | . . . . . . . . . . . . . . . c . . . |
$$ | . . . 5 . . . . . . . . . . . . . . . |
$$ | . . . 1 4 . . . . . . . . . . . . . . |
$$ | . . O 2 3 . . . . . . . . . . b . . . |
$$ | . . . a . . . . . . . . . . . . . . . |
$$ | . . O , B B . . . B . . . . . B . . . |
$$ | . . . O O B . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
So I think

is a reasonable move, but I also think it's too early to play it, because we don't know if it's going to become a good exchange yet. You have to factor in that the whole board looks good for black in nearly all variations because black seems to have played much better in the opening. I still prefer to quietly accumulate power with 'b' and see what white does next. After 'b' your move might become very good later. Also, instead of playing on the star point with 'd', black 'c' also feels better. Don't play a move just because there's a dot on the board

.
Regarding Magicwand's comment, he and I are basically saying the same thing in (except he's more concise).
Magicwand wrote:
black is trying to build a moyo but he has two weak group that can be attacked in sente.
that attack might distroy black's influence and might make that move useless.
i think it is better to reenforce black's weakstone than play that move.
I don't see any of black's stones as being weak or able to be attacked though. Rather I think those groups are in balance with the stones around them and white and black both have various sente moves available. Black is flexible.