4-4 Point 3-3 Invasion, Small Knight, Attach
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Moves are listed by frequency in professional games, which is sensitive to whole-board position. Bolded moves are commonly considered joseki.
Black c leads to this variation, in which black loses sente. However, black can sometimes tenuki after .
In pre-AI games (2016 and earlier), white would often play hane and connect with before pushing down the side. Black can sometimes tenuki after .
More often, is played as hane, starting a fight. After , white will usually cut at a or b, although c is also seen occasionally.
This relies on a ladder -- but for parallel fuseki, the ladder will normally be in white's favour. is a key point of this shape. After , black can continue at a or b, and a complicated fight will follow.
If white's ladder at a is broken, then white collapses. Instead of cutting at , white has to give way by playing .
Black can continue the fight with any of a through d
Instead of fighting with at , white can try this more peaceful continuation. After , Black will try to hem White in in the corner, but White can still decide to fight by playing here instead of
This diagram shows one possible continuation.
Chris Hayashida: There looks like there's a problem with the continuation. Black will just extend from and capture three stones. Is Black supposed to play an atari first?