4463 enclosure 3-3 invasion
This page seems to need a WME. Contents in BQM 180 can also be integrated into this page. --unkx80
(Moved from 4463 enclosure.)
The 3-3 invasion here becomes ko in this main variation; though that's not the whole story.
See http://www.gobase.org/studying/articles/matthews/ko/part5/ for commentary.
SiouxDenim: A line not covered in the above - how is White supposed to live if Black ignores the ko and plays this ?
Charles Matthews I suppose White has a choice of or a next. Black's play
seems to reduce Black's possible loss in the ko; but it also must be a concession. In practice it would be hard to kill the corner now: White must have many local ko threats such as b. Black would quite like to exchange Black c for White d, to relieve shortage of liberties around the cutting point (circled point) - but this also helps White form eyes.
This situation is not to be mistaken with 4-4 Point Low Approach Low Extension 3-3 Invasion, here is not the normal move. Because
can try to kill the invasion stones.
This is Black's most severe continuation. The fight will depend on the surrounding stones.
Locally, White is dead: after White b, Black c, d and e are miai. Note that cannot be played at a.
Rich: I can't see a good way for Black to stop White sneaking out with the clamp; couldn't this be better than the previous example, depending on surrounding stones?
Charles That's one from Get Strong at Crawl.
Rich: Sometimes better a crawling weasel than a dead lion, no? :) I see the point - if you have somewhere to crawl to, you're probably better off not invading at the 3-3 in the first place,
Charles Depends a bit; but the 4463 enclosure 2-4 approach might sometimes be more useful. Anyway,
of the initial diagram seems to be a pro move.
What about this?
[Joonas Tyystjärvi]: Supposing that the cutting point to the right of is not usable, does this work? It seems to me that after
, White is alive - are Black's moves correct? (Of course, the result is locally very bad for White.)
-William 2d?
'a', 'b', and 'c' (followed by 'd' if white connects) are all more important than taking one stone. When seeking to kill, it is important not to try and separate your opponent's stones. It is better to squish them all together into an area too small to live.
White 5, incidentally, is not that strong. It gives up on the option to descend straight down, or play one to the left. Defending 1 with a hanging connection (for the ko) really is the best white can attempt for move 5. In fact, playing this sooner rather than later may be better -- 3 for 4 might be possible as a ko threat during the fight.
I think Black can kill by playing at
instead. If Black omits
, then White a Black b
makes life - Andreas
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