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22

Choosing the right distance for an extension basically depends on your goal in extending as well as the relative strength of stones in that area. Also, we need to differentiate between extensions to just explore open areas and extensions from existing walls. Extensions from a wall Let's start with the basics first. There is a well known rule of thumb, ...


11

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 ...


6

There's an excellent and detailed answer already, but I want to throw in some other thoughts. I attended a workshop with Guo Juan (5P) where someone asked about the wall+1 rule and she explained that it's a nice mnemonic that works in some common situations (2-space jump between single stones, 3-space jump from 2 stones), but isn't much of a good rule past ...


3

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 ...


2

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 ...



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