4-5 point 4-3 approach keima, contact at 3-5, hanedashi

  Difficulty: Expert   Keywords: Joseki
Black invites the fight  

Black's move B1 here has a long history (it dates back to the eighteenth century). It impresses amateurs, rather than pros.

Main line  

In reply, the moves up to B8 are only rarely varied, in pro games.


The only variation that is worth mentioning is W3 here, catching the black stone in a ladder. Obviously, white can only play this if the ladder works.

Main line, continued  

Continuing the main line, now White decides how to handle the cutting stone black+square. Normally W1 is played (the alternative is to play atari first at B2). These are the standard plays, with White able to jump out as far as W5.

Making shape  

Now both sides try to arrange their shape on the outside, by playing moves against the inner groups.

There are a number of variations, but B1 and W2 are popular (W2 at the circled point equally so).

Making shape, continued  

Since white+circle threatens Black on the left, B1 to B5 are required (White's choice of how to play white+circle clearly determines which side the peep B3 is, too - if white+circle is played at B3 instead, B3 peeps at white+circle instead). On the upper side W6 is honte but it is also possible to play directly at W8.

Ladder aji question  

This is the joseki book continuation, assuming White wants to leave ladder aji on the outside, and that B6 is a good ladder.

The alternative  

If white plays W1 instead of a, black pushes in with B2. White answers with W3 or W5. If W3, after B4 white needs to play W5 to live, and black fetches up his shape with B6.

In a pro game, naturally, the players adjust the way of playing the later stages of this joseki, according to the needs of the overall position.

Charles Matthews, additions by Andre Engels

AI review

AI review  

LeelaZero prefers answering W1 with B2, then only protect at B4 After W5 Black crawls once more, before making shape in the centre with B8 and B0. After White a, it's time to play elsewhere, at least on a board which otherwise has only single stone corners.

4-5 point 4-3 approach keima, contact at 3-5, hanedashi last edited by Dieter on April 15, 2020 - 18:15
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