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

Black invites the fight  

Black's move 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 are only rarely varied, in pro games.

Ladder  

The only variation that is worth mentioning is 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 . Normally is played (the alternative is to play atari first at ). These are the standard plays, with White able to jump out as far as .

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 and are popular ( at the circled point equally so).

Making shape, continued  

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

Ladder aji question  

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

The alternative  

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

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  

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