[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Paths
PleaseReviewMe

 

San San Invasion of Hoshi
   

I ways to stop an invasion of the Hoshi point at the 3-3 spot. If the more skilled players could look at my ideas it would be helpful. Also, I couldn't find a page for this topic anywhere else, so I made this new one.

- AndrewB

After writing all these diagrams I realized that they all hinge on the idea that white would play their first stone after blacks 3-3 move, 2 spots up from the Hoshi point, and that black would try to cut these two stones, but after looking at it, the idea of black trying to cut there seems kinda silly. If anyone has some better ideas for responding to a black stone at the 3-3 point, i'd be interested because my only response is this:

[Diagram]
Diag.: My usual response (Play continues with W at a, B at b ....)

SAS: White 8 is wrong --- White has too many cutting points. This is discussed on the 3-3 point invasion page.



For this first set I used the idea of responding to the 3-3 by B at 2. I wasn't sure what whites response would be so these first two diagrams would be if white responded by going at 3, cutting the Hoshi stone and B2.

[Diagram]
Diag.: Diagram 1

[Diagram]
Diag.: Diagram 2

I thought this sequence turned out well for white, even though black got a little territroy.



This next variation is when instead of black placing the 5 stone as showen above in diagram 1, they place it below the 3-3 stone. (This was because I wasn't sure which move was beter at first).

[Diagram]
Diag.: Diagram 3

[Diagram]
Diag.: Diagram 4

At this point the black stones would be captured.



These next two are variations if black makes a cut with stone 7 as as shown in diagram 5 instead of the cut with stone 7 in diagram 3 above.

[Diagram]
Diag.: Diagram 5

[Diagram]
Diag.: Diagram 6


[Diagram]
Diag.: Black pushes, bad for white.

BlueWyvern: I'd say the marked stone is a bit of a trick play. Black simply extends with 1 and 3, then jumps to 5. White needs to do something about the defect at 'a' now, or black will push here and rip White's position appart. White cannot hane early at 3 or 'b', or Black will cut at 2 and or 4 respectively. I'll leave it to the reader to work out the continuations with these hane's, but White has quite a desperate struggle.


[Diagram]
Diag.: Black pushes and cuts.

Alternately Black could try the push at 1 first with the cut of 3 which leads to a very one-sided fight in favor of Black, especially if Black has a ladder. Regardless of how you look at it, playing the marked stone is very bad for White if Black responds in a correct manner.

Yeah I realized this after I wrote all those diagrams, i'm just going to delete them if thats all right.

-Andrewb

HolIgor: Your move is worth consideration in the case when there surrounding is such that black does not get an easy life when broking to the center.



This is a copy of the living page "San San Invasion of Hoshi" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.