4-5 point, 3-3 invasion, keima

    Keywords: Joseki

Table of contents Table of diagrams
Standard sequence
Alternative
White resists
White resists (2)
Previous standard
Hane
Crosscut
Stretch

Standard sequence

[Diagram]

Standard sequence

Previously considered a crude move, W2 is part of the standard sequence today

bugcat: For a few years I've been under the impression that extending with (5) is an error, and that the double hane is pretty much always the best move. I looked up this sequence in Waltheri, and only one professional [ext] game (and that from 1960) had B5 as the extension. In comparison, nineteen had B5 as the double hane. So isn't the double hane variation the standard sequence and the extension the sideline?

PS. In my book the 3-3 is an invasion, not an approach. There's no "3-3 approach to the 4-4."

[Diagram]

Alternative

B5 can also be played as a double hane. Black can locally continue at a but is more likely to play elsewhere.

[Diagram]

White resists

White can capture black+circle but suffers forcing moves at B6 and B8, even B10. This is inefficient for White

[Diagram]

White resists (2)

W1 is even worse than W5 in the previous diagram. Even if the ladder doesn't work, Black can squeeze.



Attach

[Diagram]

Previous standard

W2 used to be this immediate contact play leaving Black to choose a or b.

[Diagram]

Hane

If B3 blocks at W6 we revert to the standard sequence. This time however, Black can choose to atari at B3 and force White into bad shape. This option to play on both sides depends heavily on the circumstances at the sides.

bugcat: I only found one instance of anything like this in Waltheri, being used by Shusaku in a two stone handicap [ext] game in 1851. In that game, B5 was a solid connection and B7 was a solid extension. Did you source this sequence from professional play?

[Diagram]

Crosscut

The crosscut leads to a long one way street where Black crawls to have enough liberties to capture the corner, while White gets outside influence by pressuring White. The variation may even depend on who has a stone in the bottom left.

[Diagram]

Stretch

B4 here leads to territory in sente for White and influence for Black.


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