Source: 
Problem diagram.
White's response to the marked stone?
(This problem is a follow up to last week's problem.)
Keshi and Uchikomi, Kaoru Iwamoto 9 dan
Solution follows
(or click here to download SGF)
A mistake.
White 1 is a mistake.
Black simply has to pull back at 2.
Now A and B are miai for Black.
White's marked invasion was not a success.
Correct.
Pushing ahead at White 1 is proper.
Black can try to stand up at 2, but through 6,
White's marked stone still has aji, e.g., after an
invasion at A.
Black variation.
Black can also press at 2.
Through 6, White has connected to the invading stone, but Black
builds outside influence and reduces White's lower right
area. The position is equal.
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