Enclosed Territory Invasions

  Difficulty: Intermediate   Keywords: EndGame, Shape, Theory

Heh, to add a bit to SL, I'm putting up some examples of invasions of enclosed territory.

[Diagram]

Shape #1

This shape may look a bit big, but it is very easy to defend! You might think that the 3 - 3 point is vulnerable, but the walls on both sides protect the corner from being taken.

Here are some examples of invasions.

[Diagram]

Shape #1-Invasion #1

1 secures the shape


LukeNine45: I think your wall is far enough away that the tripod group will live, so I think B5 might be wrong:

[Diagram]

Shape #1-Invasion #1 (Tripod group)


LukeNine45 (later): Hmm, seems it dies with this sequence:

[Diagram]

Shape #1-Invasion #1 (Tripod group)


LukeNine45: Hmmm, no-- Perhaps this ko?

[Diagram]

Shape #1-Invasion #1 (Tripod group)


[Diagram]

Shape #1-Invasion #1 Continuation

No sacrificing, No mess =D


[Diagram]

B3 the killer

No way should this 3-3 invasion live. B need not play the usual move; with so much influence, B1 is in no danger. B3 is often a good start if the plan is to kill. B crawls on the second line, but W isn't getting any eyes this way.

[Diagram]

W option 1

Bulky five at best.

[Diagram]

W option 2

Just no room.

-Warfreak2

[Diagram]

Shape #2

The 2nd shape comes from a question that I've asked myself over and over again, how much space can a side wall of territory have before it's vulnerable.

So far, a depth of 5 points is what I've seem to believe as the deepest it can go without being vulnerable at all. Although, with such a huge space, a small mistake could cost you a big bite in territory. Here is an example of a failed invasion and a successful invasion.

[Diagram]

Beginning of the invasion

A natural invasion would be 3-3, but I might post a 2-2 or 2-3 invasion example later. I don't know if "2" is the best defense, though, I'd like comments on that.

PetriP? No it is not. circle point for instance makes better use of the huge wall. 2 is just way too close to wall to do any real work.

[Diagram]

Continued...

2 I've found is the best move for the situation.

8 Makes the invasion unsuccesful, but let's see a variation of the same foundation of moves. Even if 7 was played at 8, white could have played a hane at 7.

[Diagram]

Succesful Invasion

The 7 lets Black the breathing space to make 2 eyes. White's 8 is just an attempt to stop black from stealing any more.

[Diagram]

Continuation

[Diagram]

The End

Two eyes, and this huge success means the opponent's eye on the other corner. w25 points taken aay{20 points for all the new stones in ur territory, 2 points of territory, and 3 points for the prisoners}. Although, you should have learned your lesson and defend correctly this time.


[Diagram]

Variation

See how the 7 secures the eyes no matter what? A, B, and C were all candidates for eyes =D.



This is a copy of the living page "Enclosed Territory Invasions" at Sensei's Library.
(OC) 2007 the Authors, published under the OpenContent License V1.0.
[Welcome to Sensei's Library!]
StartingPoints
ReferenceSection
About