BQM 236
The result of this invasion felt unsatisfactory for Black.
To put it simply, I got spanked by this twice at go club last week. This week I would like to show that I learned something and not get spanked again ;)
Looking at this, it occurs to me that I should have played this sequence in the corner first. How would this affect the invasion?
Bill: Yes, Black's position is much better in the second diagram. In the first diagram the
stones look a bit heavy, and in the second Black can exploit the weakness of
.
Please show the whole board and your continuation in the game. Thanks. :-)
Velobici: I wish I could show the whole board and continuation. Unfortunately, I dont remember the games. Both were played at the go club that I attend on Sunday evenings. Had it been on a go server, I would gladly provide the SGF file.
Bill, could you show one or two ways to exploit the weakness of
?
Bill: Ba. Normally that will be sente. Usually it is not worth playing, but if Black is in trouble....
Charles Matthews By the way, Black left an incomplete formation.
(See the /Discussion page for Charles's point about the Invasion diagram.)
Velobici: Given correct play by Black, as in the digrams "
tenuki" or "Shape point", how should Black handle the White invasion on the third line shown in both digrams: "Invasion" and "
tenuki" ?
Bill: Velobici, I see that nobody has posted an answer yet. I showed this to a U. S. 5-dan the other night, and we discussed it a little. Afterwards I said, "Aren't 5-dans supposed to know this kind of thing?" ;-)
Well, I cannot provide a definitive answer, but you need some help. So let me give my immediate reactions.
My first imression is that
is a mistake. Black is too strong on the left for an invasion this deep. Normally I would expect something like the standard keshi with the shoulder strike at a.
My plan is simple. Enclose
. White can probably live, but at the cost of playing at b, which loses the big cut at c, and giving me a strong wall to work with the rest of Black's moyo.
The kosumi,
, is my first thought.
may be better, but I know
is solid and will lead to a strong wall. Also, attachments tend to lead to more variations. I have an advantage; I want to keep it simple.
I suspect that
would be better at a, but that would not be consistent with the invasion. White plays
before
-
, because later Black might not respond at
.
-
is a standard sequence.
It looks like White can live with
-
. This looks pretty bad for White.
There are still some sticky questions. How strong is White's threat at a? Should Black continue now with Bb - Wc? That strengthens Black on the left but loses territory on the right.
The answers, I think, lie with the rest of the board, which we cannot see.
![[Diagram]](../../diagrams/4/54fc73c3a728508cdcae166547b653d5.png)
![[Diagram]](../../diagrams/46/a4fe48c8ec2953e4b683ec58278cd061.png)
![[Diagram]](../../diagrams/35/af5c6bcbf2226d0e6aaf67f6b496e7cf.png)
![[Diagram]](../../diagrams/2/1c8145bcf0976d9bae9d8bb328ec2a87.png)
![[Diagram]](../../diagrams/6/39ab32e6478e641e883af0875571a324.png)
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