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Three Three Point Invasion Joseki New Move
   

[Diagram]
Diag.: An interesting option

What is the purpose of black 1? How should white react?

Alain


[Diagram]
Diag.: Tricked

I guess I've seen this one before. I think he tries to trick White into 2 upon which 3 and 5 shut in her stones and make considerable thickness.


[Diagram]
Diag.: An interesting option

So I think white has to resist with 4.


[Diagram]
Diag.: An interesting option

This is a line of play that comes into my mind. Depends on the ladder at A, but Black can sacrifice the marked stones, can't he ? Fairly complicated ...

Dieter




[Diagram]
Diag.: Sacrifice (1)

Interesting variation, Dieter. I think that if the ladder works for white, this is good enough for her. If black is going to sacrifice the stones, he would better not play at 9 in your diagram (the marked spot here), because this stone is going to be worthless once white has captured. It would be better to play at 1 here immediately, or perhaps black A-white B-black 1-white 2. Still the result seems good for white.


[Diagram]
Diag.: Not a good idea

But what can white do if the ladder does not work for her? The variation shown by Dieter is clearly bad for her in that case. My first intuition was to play at 2 without the atari at A, leading to this variation. I do however get the impression that this is good for black: because the three white stones have only 2 liberties, white B is not sente, and white will have to play one of the circled points to use the aji of these stones.

I do however not see any other good options for white either, so when the ladder works for black, only the 'Tricked' diagram and this diagram remain for white. Either that, or I missed something.


[Diagram]
Diag.: The only move left

If I have missed something, it seems that white 2 is the only move we haven't discussed yet. Black 3 seems like the natural answer, after which white 4 and 6 follow.


[Diagram]
Diag.: follow-up

This shows the follow-up from the previous diagram. White is locked up in the corner, but the marked stone still has quite some aji. Exchanging white A for black B would decrease this aji.

-- Andre Engels



[Diagram]
Diag.: An alternative for B 3

I like Andre's 2 for W. It has the feeling of a true refutation of a trick move. One question is whether B can resist more strongly with 3 than in the original diagram. Considering only the corner it does not seem possible. However, there may be a problem...


[Diagram]
Diag.: B strong outside

Remembering that the premise behind the 3-3 invasion is that B has already played on the outside, can W afford to fight hard here or not? B 'a' now leaves W without 2 eyes.


[Diagram]
Diag.: Black fails?

Therefore after B 5 W turns back to 6. However, after 8 it does not look like B is going to able to contain W.

--DaveSigaty



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