4463 enclosure 2-5 approach

    Keywords: MiddleGame, Joseki
[Diagram]

Very low approach to 4463

One way to enter a framework built up around a 4463 enclosure is with W1 on the second line, sometimes called a submarine. This gives better chances of unconditional life than the 3-3 invasion, which normally becomes ko. On the other hand: there are some complex variations possible; White may need to apply sabaki techniques; and it is undeniable that White may end up with a low position.

White will often invade this way when black has a stone at or near black+circle. One key idea here is that the directions of a and b are miai.

[Diagram]

Black's answers

In pro games, four replies from Black are most commonly seen. In order of popularity, they are:

Naturally, since this is a middlegame joseki, any nearby stones may have a big effect on the choice of direction and subsequent fighting.


[Diagram]

variation c

When black plays B1, white's most common answer is at or near W2. The following moves depend on the surrounding positions. Sometimes white will play b immediately to make eye shape; more often white will wait until later to decide between a and b. Black will usually play at or near d to chase white into the centre, but sometimes black will press at c.


[Diagram]

variation d

B1 is only usual if there is no stone around a. The reason is that White can live comfortably in the corner. If there is a black stone around a that is too much to give her, but with no stone there, denying her the corner will give her a comfortable position on the side, so it is not as much of a disadvantage. Still, even in that case, if Black wants to confine white to the corner, Black b instead of B1 is more usual.

[Diagram]

standard sequence

Although W3 would be enough to live, White will crawl at W1 once to avoid being completely hemmed in on this side. After B4, White can make a living group with either W5 or White a. W5 is obviously better endgame at the top, but White a leaves some aji of cutting. If Black does not want White to play a, he exchanges Black a for White b before playing B4; however, if White would have played W5 anyway, this exchange becomes aji keshi.


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