Questions tagged [invasion]

A Go term for playing inside another player's moyo with the intention of living or escaping.

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19
votes
2answers
2k views

Why is this corner enclosure considered to be safe against 3-3 invasion?

I have read somewhere, but unfortunately forgot where that the following enclosure is safe against the invasion at a. $$ White invades at 'a' and supposedly dies. $$ --------- $$ -........ $$ -..........
15
votes
4answers
2k views

Second line invasion of two-space extension

The two-space extension is a very common pattern and forms a base. I've found lots of material here, and here, and elsewhere on how it cannot be cut and how to defend against various invasions. ...
8
votes
5answers
768 views

How do I chose invasion or reduction points?

I have the following board: $$cm1 $$ +---------------------------------------+ $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . O . . . . . . . . . . | $$ | . . . . . . . O O . X . . ...
8
votes
1answer
168 views

What is the smallest territory in go that can be successfully invaded?

Let's stay one player has a corner of the board totally enclosed, but with no stones in it, like this: $$ ------------------ $$ | . . . . . . X . $$ | . . . . . . X . $$ | . . . . . . X . $$ | . . . . ...
2
votes
2answers
286 views

Does the 3-3 invasion work with 3 stones already placed?

With the three black stones placed, I did the 3-3 invasion. $$Wm1 $$ ---------- $$ ........| $$ ...X....| $$ ...X.1..| $$ ....X...| $$ ........| I tried tried to force a KO and did get 2 moves ...
1
vote
2answers
224 views

3-3 invasion into 4-4,6-4

In josekipedia, they state that this exchange is a mistake See http://www.josekipedia.com/#path:pdttpfqcpcqdqepbobrbpaqaqb for the full sequence they argue with. But, I think that their argument is ...
1
vote
2answers
112 views

Tricky 3-3 invasion

If white tenukis thrice after the 3-3 invasion, and answers Q18 with R18, then white kills with S19: But what if white plays Q19 instead? Can black still kill unconditionally, or ko is the best one ...