黑15 didn't complete building the wall with A because black is afraid of falling gote then white can easily reduce black's moyo with B (see pro game).
黑: 崔哲瀚 白: 洪基杓 白胜 May 26, 2009
黑11 = A
白16 & 18 are common invasion 手段. 黑19 could also consider Q18. Professional games 白20 tends to peek at A first then escape outward. I tried a few times but the result wasn't so great.
黑: 谢赫 白: 张维 November 15, 2008 黑胜
Fuseki variaton up to 白40 feels black's territory and shape are better.
白24 = A
My proposition: white can settle easily with 白20-24.
If black counters with 黑25 then white can cross or block-in black with 白32.
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