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First of all, note that, unlike the more popular shape with a kosumi instead of a keima, this shape carries a lot more aji and is vulnerable to yose tesuji and approach moves. $$ A lot less aji $$ --------- $$ -........ $$ -........ $$ -.....X.. $$ -...X.... $$ -..X..... $$ -........ $$ -........ Oh, and by the way, an invasion is supposed to live in ...

The 2 space extension is generally regarded as very hard to cut and thus solid, providing at least 1 eye with various options to gain a lot more eyespace easily. However, invasions and attacks are still possible. The B1 move in your diagram is actually a standard invasion with the marked black stone around. $$cm1 A possible invasion of two-space extension ...

Although it can and often does provide territory, that is not the primary reason that you want to play the two-space extension on the third line; what you're looking for with this extension is a base which is very difficult to cut, one which you can use to fight and/or secure territory as the game progresses. Unless black has support, white can easily ...

Question 1: Ignoring the three marked stones, how would one usually defend this invasion? Is J17 correct here? They really can't be ignored for a question like this. "This" invasion doesn't come out of nowhere (except vs. a belligerent beginner). Question 2: Is white 2 above already a horrible mistake? Or does there exist a follow-up after black 3 ...