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33PointInvasion

 

3-3 Point, when does it work
Path: PleaseReviewMe   · Prev: SanSanInvasionOfHoshi   · Next: ExtensionFromAWall
    Keywords: MiddleGame, Joseki

mat: I'd like to know which configurations of black stones allow a 3-3 invasion and which don't. Please continue this list!

Blue Wyvern: Also, could people add the josekis if they know them? Somehow I always screw up invading a knight's move from the star point (hoshi) even though I am sure it is possible to live.

Charles Matthews Beware of expecting answers that are too clear-cut. There may be a ko, and there may also be continuations that are messy, depending on circumstances on the outside.

[Diagram]
White can live

This one is discussed in 3-3 Point Invasion and 4-4 point 3-3 invasion joseki



[Diagram]
Black can kill


[Diagram]
?

Taw: What about this one ? Normal joseki doesn't seem to work, but is there some other way to make life ?

Charles Here the invasion should die: but there are some complexities.


[Diagram]
White 2 may cause a loss

This suggested choice of W2 could cause a major loss in some cases. But not with this choice of B3. Now W4 at a expects to live somehow.


[Diagram]
Tough continuation

After B5 here White has a dead shape in the corner. Therefore W4 is wrong.


[Diagram]
Try for ko

Moving W4 to the 2-2 point, as here, is an attempt to make ko after B8, W7. But Black gets round this with the placement at B7. White is dead after B9, but has some aji at a or b.


[Diagram]
A better way

White can simply play W1 and W3 here, to which B4 is the natural answer to try for an outright kill. Then White has some good aji at a. This is better than the previous variations that have a white stone at b - would White play there now?


[Diagram]
Probe

The most usual reason for White to play out the exchange WC/BC here, which is seen in high-level games, is to make W1 a better play. Now White has the endgame move at a, which Black can't resist because after Black b, White c, Black d, White e, White is alive in the corner.



[Diagram]
?


[Diagram]
?


[Diagram]
White should die, but how?

See 364463Enclosure. --Dieter


[Diagram]
White should die, but how?

lavalyn: My best shot at it leaves White with something just less than an L group with leg and gote.

Brian: If Black 7 at a, doesn't White die?


[Diagram]
?


[Diagram]
White should live, but how?

Scartol: This is covered in 4463 enclosure 3-3 invasion and 4463 enclosure.



[Diagram]
White should live, but how?

[Diagram]
The normal sequence

[Diagram]
White lives, Black gets thickness

Also covered by Sakata Eio in his Tesuji and Anti-Suji of Go (Model 23: The Real Move - Honte), where the author explains why a black move at a before proceeding with 1 is anti-suji (zokusuji). --Nando



[Diagram]
White will die, but how?

I know this enclosure is supposed to be immune to a raw invasion without support by White, but how does Black kill?

(See 364473 enclosure.)



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