tapir: In a recent game (still going on) I came up with the following sequence as White. I looked it up in a database and found it is sometimes played by professionals. I know many players of my strength play instantly, which I don't like, so here I tried to induce it in a manner that helps me on the outside.
Is this reasonable?
Is this overplay?
Slarty: I think Black should seriously consider tenuki, because too early could be a little slow. Reasonable would depend on the board - it's a fast way to play, not the normal local idea.
tapir: Why would you play in the first place when you believe the follow up is too early?
Slarty: is likely not a bad exchange for Black. White has a problem of how to continue. Enclosing at 3 is too slow. Usually the follow up is a, which is a big area but still thin - Black has a chance to live at b, can cut, force from the corner etc. Choosing to live with is definitely good, but not as appealing as the initial . After , is light, and the temperature dropped, so there could be something to do elsewhere. There are loads of times you might make an exchange before it's time for the follow up, like playing an approach move. More simply though, it's going along with White's plan; as you suggested, when white does this, the exchange is designed to be good for White.
Dieter: to me is a good move in itself. To provoke it with seems a thank you move for Black. Next, the sabaki tactics of and show that White has created problems for himself in what used to be a balanced position.
This would perhaps be ok if there were substantial offset generated by . But the keima on the outside is thin, so we can speak of the kind of influence that kikashi stones have. Altogether I don't think this is a balanced result.
tapir: I admit, I have trouble distinguishing thank you moves from inducing moves (and thin from light). Still with at c I would be fairly confident as is.
White must almost resolve to a ko. This doesn't seem to do justice to the original position.
tapir: It seems to me that Black has far more to lose here. (Interestingly in the three professional games I have with this position Black always connected instead of .)
Slarty: is a weird move. a is ko to punish, but otherwise, this will be good enough, right?
Uberdude The original sequence looks locally reasonable to me but highly dependent on the global position whether it is good.
tapir: Hehe, first player to comment it looks reasonable without much "but ..." :) As I said, I saw the 3-4 attachment a lot by players around my level whenever you invade their mixed 3 space extensions and was wondering whether I can make an exchange where the sequence feels less odd, by inviting in the first place. Since then I read some more.
Uberdude: Probably 6 should hane above 5 to make a bigger life. In my games this sacrifice of the approach stone to take the corner is more common than the attachment and is simpler. In fact black might feel a bit sad and over concentrated. To resist that he could kick the approach stone rather than 3 and then do the attach and crosscut below, or just hane connect for a big sente corner.