4-4 point 3-3 invasion, jumping away

  Difficulty: Expert   Keywords: Joseki
[Diagram]
The modern move  

This choice of B1 is a relatively modern move, which became quite popular from the late 1980s onward. The aim of the move is to keep sente. In professional play, a has been the common response. Since the advent of strong bots, B1 has been the default move in the invasion patterns, and b is the default response.



The default pattern

[Diagram]
Tenuki  

After the W2-B3-W4 exchange, Black can play away, if the board is mostly empty, to be the first to play in an either empty or 1 stone corner.

The price for playing away is that White can play a. Black remains with a wall without extension. AI bots have evaluated this as playable for Black.

If Black plays a himself, White will play b and either take sente or hane at the head & foot of 2 stones.

If Black continues here, he should do so at b or c.

[Diagram]
Double hane to keep sente  

If Black plays double hane at B1, White will take the stone, giving Black a forcing sequence up to B9. Then Black plays elsewhere, leaving a big point at a.

[Diagram]
Inside hane  

With the inside hanes at B1 and B3, Black forces White into the corner, but loses sente. (B7 can also strongly connect at a). White can play elsewhere

[Diagram]
resisting W5 @ black+circle  

White can resist like this. She gets out in sente with W9, but Black makes a lot of profit and gets central influence.

[Diagram]
Inside and outside hane, Black sente  

Using the combination of inside and outside hane, Black takes influence but now with sente, while White gets out.

[Diagram]
Inside and outside hane, White sente  

Black can also stop White from going into the top side, but at the expense of losing sente.



The attachment

[Diagram]
Tricking black  

White can play W2 here. If B3 extends, we revert to this pattern and Black loses sente.

[Diagram]
Fight  

So, B3 should hane and we get a fight.

[Diagram]
Fight (ctd)  
[Diagram]
Fight (ctd - sacrifice)  

We get this rather amazing sacrifice. White has the corner and outside influence. Black has a strong group and sente.


4-4 point 3-3 invasion, jumping away last edited by 107.210.159.110 on April 9, 2019 - 21:58
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