Problem diagram.
Black plays.

Source:
Attack and Defense, Ch. 7, p. 163
Akira Ishida & James Davies, Ishi Press

Solution follows    (or click here to download SGF)

Good.
Black 1 is a good invasion point. A White play at 2 is usual. White keeps Black separated and the play is big with respect to the corner territory. Black 3 is a possible light continuation. But White should not push through with 4, because through 9, Black has splendid shape.

Correct White follow up.
Instead of the previous diagram, White might follow up with 4 here. Black is OK, but has a new set of problems to solve.

White variation.
White does not want to play 2. After 3, Black links up.

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