Low invasion of mixed three space extension
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Keywords: MiddleGame, Joseki
This is the most common invasion point. a is the most common answer. b is aggressive and c allows to escape temporarily but possibly prepares for a large scale attack.
is usually best, but requires two ladders for white to work.
at
is not recommended.
at
is not as severe. It is common for Black to take the outside with
. He can also play atari from below ...
If both ladders work, black sometimes plays the -
combination, if he
wants to fight. Note that
is one of the few moves that break both ladders at once.
Depending on the circumstances, Black may sacrifice the stone in favour of sealing off the side and influence the centre