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UnusualEnclosures

 

4473 Enclosure
   

[Diagram]
Diag.: 4473 enclosure

This is a common way to develop a 4-4 point in the corner.


[Diagram]
Diag.: The 3-3 invasion

This is the main variation of White's 3-3 invasion of the enclosure. Black 4 may also be played at 7 (see below).


[Diagram]
Diag.: Main variation, continued


This is the standard line, and White ends in sente. The White group is an L+2-group and is alive. Black though has considerable influence now.

Variants:

  1. White 1 at a, challenging to a ko.
  2. White 3 at b. This affects forcing moves (Black d is then sente against the corner), and endgame plays in the corner. With 3 as played, Black c threatens a ko in the corner.
  3. Black on occasion omits 4, but then White at 4 causes a fight.

[Diagram]
Diag.: Another way

Black may also play 1 this way. Then White 2 (or a) lives. Black 7 here is proper, but may be omitted: if Black wants to end in sente here it may make sense to play 1 in this manner, rather than follow the above main variation.



Dieter: Question. Black 8 at a reduces the corner to an L+1-group, whose status depends on sente. So Black can play a in sente ?

[Diagram]
Diag.: Kikashi

Black 1 is certainly a good kikashi against the corner. Black 3 here is a useful way to follow it up, for fighting purposes, since it still threatens the corner. It is unlikely to be the correct endgame play, though, in typical situations.



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