BQM 584

  Difficulty: Advanced   Keywords: MiddleGame
Sequence in question  

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 W4 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 B3 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 B1 in the first place when you believe the follow up is too early?

Slarty: B1 W2 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 B3 is definitely good, but not as appealing as the initial B1. After W2, B1 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 W2 B3 exchange is designed to be good for White.

Sequence in question  

Dieter: to me B3 is a good move in itself. To provoke it with W2 seems a thank you move for Black. Next, the sabaki tactics of W4 and W6 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 W2. 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 W6 at c I would be fairly confident as is.

Continuation 1  

In this continuation, White is under a lot of pressure.

Continuation 2  

A permutation leading to the same result

Continuation 3  

This W4 is unbearably submissive. Black can continue to harass White with a or b.

Continuation 4  

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 B1.)

This unlikely ko would be easier for Black (but now White could live conveniently by W2 at W4).  
Challenge move  

Slarty: B1 is a weird move. a is ko to punish, but otherwise, this W2 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 B3 in the first place. Since then I read some more.

Another follow-up I - closing the right side (keeping a in sight)  
Another follow-up II in different context  

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.

Another follow-up III - actually quite common  
Sacrificing the stone (White in overconcentration danger)  
Sacrificing the stone II  
Comparison I  
Comparison II 1-10  
Comparison II 11-14  

BQM 584 last edited by on April 27, 2014 - 03:27
RecentChanges · StartingPoints · About
Edit page ·Search · Related · Page info · Latest diff
[Welcome to Sensei's Library!]
Search position
Page history
Latest page diff
Partner sites:
Go Teaching Ladder
Login / Prefs
Sensei's Library