# Shape Problem 4 / Discussion

Sub-page of ShapeProblem4
Black needs to correct this shape

Charles Matthews My first comment here is that the shape relationship between and is never really good.

DaveSigaty: I think that we have to add into the mix before we can try to claim that the - relationship is not really good. When the White stone is missing, it is the standard (5-6 times more frequently played than any alternative) choice for closing the corner.
Abstract pattern (1)

In this case and have a good relationship.

DaveSigaty: With both and on the board the play at does not have a very successful record. While the theoretical relationship may be nice, it is too passive. When jumps to , the corner is still vulnerable. Black will likely want to add anyway. At this point is he better off with the stone on ?
Abstract pattern (2)

And also in this case and have a good relationship.

So you could say that Black has created himself a shape problem, by taking 50% from each pattern.

In this case:

The 'big bulge'

I recommend on general grounds this 'big bulge' shape made of two keima.

HolIgor: We have a winner. This is what I meant.

White cannot lean

A play at a becomes impossible.

Corner aji

Maybe there are still 3-3 invasion problems at a after . Black could try a play like b to keep the corner.

Playing , however, seems to get Black out into the centre in good shape. So it looks like good style to me.

Jan: This was my first idea too, but Charles was quicker[1] (but then, I haven't written a book on shape :-). One thing I wasn't sure about was whether the correct solution really keeps white separated. What happens after the following moves? seems to be able to reach the upper-side group.

White trying to connect

White trying to connect

Karl Knechtel: I'm not convinced of that. (5-8 are shown to indicate that a counterattack is futile.)

[1]

Charles Not in the book, and of course I cheated with a database (I wouldn't enjoy posting comments without some sort of verification). But 'big bulge' is a term from Shape Up!

Shape Problem 4 / Discussion last edited by KarlKnechtel on August 18, 2003 - 05:12