Shape Problem 4 discussion
Difficulty: Advanced
Keywords: Shape, Problem
![[Diagram]](../../diagrams/37/341c52f1c1ae5791f17428c229c09f10.png) | 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.
![[Diagram]](../../diagrams/15/15ac97a5bd7f5e1e0fb60cb28106a2b6.png) | 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 ?
![[Diagram]](../../diagrams/23/bc6971916231d5860d364ccf1cf7661b.png) | 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:
![[Diagram]](../../diagrams/19/ad74f710fec1035f88a699484a63bf16.png) | 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.
![[Diagram]](../../diagrams/47/e83bc72cbf33cbcf4019a91188011266.png) | White cannot lean |
A play at a becomes impossible.
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.
![[Diagram]](../../diagrams/23/c0a8443921daea98f6b6930fccfa40d1.png) | White trying to connect |
![[Diagram]](../../diagrams/12/8632426177ece225a046540e2e651bdb.png) | 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!
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"Shape Problem 4 discussion" at
Sensei's Library.
2003 the Authors, published under the OpenContent License V1.0.
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