Low invasion of mixed three space extension
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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 ...
at
.
involves a ladder.
If the ladder after does not work, then this is catastrophic for white. (If it works, black will not play this way, of course.)
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.
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