4464 enclosure 3-3 invasion
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After -
, white has both 'a' and 'b'.
Of course, going back to the original diagram, this means that if black adds another stone almost anywhere in this area, it forces white to respond with his corner group or else black will play and make the corner a ko for life.
Prior Discussion
Jesusin: This is a diagram from the book "Get strong at invading". It is a middle game joseki. There are other possibilities for .
The text (answer to problem 107) says White is alive after the sequence.
But I do not seem to find this group alive. Here are my variations:
Charles Matthews Try at
, as in Continuation 2, but after playing White b, Black a. Black is short of liberties. If Black is very strong locally it may be possible to kill White after White comes out at
. For example, the game between Fujisawa Hideyuki and Go Seigen, 1973-11-18.
Up to White is dead. If White a next, then Black b.
What am I missing?
Andrew Walkingshaw: What if, instead of a...
Jesusin: Thank you very much, Charles and Andrew.
Hans: White should hold the cut (2 in Continutation 1,2) in reserve. Then white can escape or -if black prevents this- live as shown in the 2 diagrams above.
For the sake of completeness I will show the other variation for in the first diagram:
Just to make this page complete I would like to bring up a situation from a game between Lee ChangHo - Yoda Norimoto. This was played in the 2nd Round of the Teda Cup on the 13th June 2004.
If the previous diagram is ok, then why didn't black play it ... because later on in the game white played the following moves. These would not have been possible.
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