4-4 Point 3-3 Invasion, Small Knight, Attach
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The 4-4 Point 3-3 Invasion, Small Knight, Attach is a move that threatens the flying knife joseki. It is normally only played when the invader possesses the ladder.
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Moves are listed by frequency in professional games[1], which is sensitive to whole-board position. Bolded moves are commonly considered joseki.
After
, black can try any of a-d. Black a leads to the variations at 44Point33InvasionExtension, whereas b reverts to the "hane-stretch" variations at 44Point33InvasionJoseki.
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
.
Fighting variations
More often,
is played as hane, starting a fight. After
, white will usually cut at a or b, although c is also seen occasionally.
Inside cut
(see Flying knife joseki for details)
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
.
Outside cut
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?
Discussion
See also
-
This video by Yeonwoo.
References
- [1] Frequency statistics were obtained from
Waltheri's Go Pattern Search using the full database restrained to a local search (accessed July 2022).
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