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Referenced by
UnusualEnclosures
ThreeCrows

 

4435 enclosure
   

[Diagram]
Diag.: 4435 enclosure

The assumption is that this is made from the initial 4-4 point.


[Diagram]
Diag.: reduction sequence


This is a standard way to reduce a framework based on 4435. The 3/4 exchange may sometimes be omitted.


[Diagram]
Diag.: From the 3453

Starting from the 3453 enclosure, Black 2 after White 1, rather than Black a, is possibly too steady (though one can hardly call it a mistake - it's one possible answer to this as middlegame joseki). This accounts for White's willingness to force Black in the reduction sequence.



[Diagram]
Diag.: early endgame sequence


The 3-3 invasion in this position cannot live, but may be useful in other ways. Sometimes it can function as a probe. Here it gives White a big endgame play at 3. Black needs another move at a to secure the corner, so this should be played in the early endgame, when it ought to be sente.

[Diagram]
Diag.: life

If Black reacts on the other side to the marked play, White gains life in the corner.



[Diagram]
Diag.: Three Crows

This formation may arise from the 4435 enclosure, usually with at least one white stone at a or b. It is known as the Three Crows.



This is a copy of the living page "4435 enclosure" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.