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19

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 ...


12

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 ...


10

First off, count the current score. If you're winning, do not invade. Just make sure you keep white small enough that you still win. Let use further presume that black would be losing. You counted, so you know by how many points. A move around c could be parried with a sacrifice of two white stones while sealing off the rest of the upper right corner ...


5

$$cm1 $$ +---------------------------------------+ $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . O . . . . . . . . . . | $$ | . . . . . . . O O . X . . O . . a . . | $$ | . . . , . . . . . X . . . . . O . . . | $$ | . . . . . . . . O O O . . . . . . . . | $$ | . . . . . . . . X X O O . O . . 1 . . | $$ | . . . . . . . . . . X . . . . . . ...


5

Maybe I'm missing something, but I don't think that shape is alive. $$B $$ ---------------------------- $$ | . . . . . . . . . . . . . . $$ | . O 7 1 . . . . . . . . . . $$ | 4 . O X . . . . . . . . . . $$ | . 5 O X . . . . . , . . . . $$ | 6 2 X . . . . . . . . . . . $$ | . 3 . X . . . . . . . . . . $$ | . . . . . . . . . . . . . . $$ | . . . . . . . . . ...


3

Liam showed a good way to kill the invasion already, but you can be even more mean and play 2 at 4: $$Wm1 $$ ---------- $$ ........| $$ ...X....| $$ ...X.1..| $$ ....X...| $$ ......2.| If white then plays 3, you just draw back instead of playing below 1, and you avoid a cut at 4: $$Wm1 $$ ---------- $$ .....c..| $$ ...Xb.a.| $$ ...X.1..| $$ ....X.3.| $$ ...


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 ...


1

Given the size of White's territory, you are probably behind. Then the question is, can you catch up, and if so, how? I'll save the first question for last, and answer the others in order: 2) You have the choice of ONE invasion point, a, b, or c (or some alternatives mentioned by other posters). Choosing one strengthens White sufficiently to preclude the ...


1

Many question in one post ... An invasion on a should work, because the corner is not yet 100% secure. White will probably build up strength to the outside leaving no potential on b. White will probably get the initiative afterwards. An invasion on c looks very big, probably bigger than the corner invasion because of the two white stones to be captured. ...


1

Black 6 should be at white 7. After this white dies uncondittionally. https://online-go.com/demo/66482


1

In general, corner enclosure is a great thing. If you can manage to do so in the early game, you have a big advantage. You gain a lot of free moves on the outside, since the opponent must protect his corner. You will then build huge walls with a big impact and you can greatly develop to both sides and you have also impact to the center. (But note that this ...



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