BQM 288

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[Diagram]

Safe?

I have read many times that the above corner enclosure claims the corner. However I have never seen the correct way to protect the corner from a 3-3 invasion. The best response I have found is a ko.

[Diagram]

White failure

The above sequence kills White. However White can do better! Instead of W9 White can set up a ko.

[Diagram]

Ko

Black kills by winning the ko at a, while White lives by winning the ko at b.

So, can anyone show me how to unconditionally prevent White from living?

Agro1986 - 16k KGS

[Diagram]

Exercise

The problem is with Black B4 in your diagram. Here's the challenge: take advantage of your outside strength to play on the vital point inside.

[Diagram]

Possible solution.

unkx80: It may also be possible to achieve unconditional kill with B2.

[Diagram]

4-4 Point.

Imagist: The 4-4 point is not really intended for enclosures as much as providing center and side influence while keeping the other player from taking a corner in the opening. A premature 3-3 invasion at a without support from other white stones lives, but benefits black more than white, as it strengthens black with vast influence toward the center and sides while providing little territory for white in exchange. Playing at b or c is inconsistent with black's influential strategy, which may be why this formation seen more in amateur than professional games. b and c might be good defensive points if white invades from the sides, but otherwise black should use longer extensions to the sides to leverage his influence. If black ever feels the need to enclose the corner, a play at a secures the corner more efficiently than b and c. This is what I have been told, at least.

Alex: Yeah, but you rarely see strong players use a to close the corner, because it's too single purpose and contrary to the nature of the star point stone. Usually you'll see a shimari with c or e, which doesn't prevent a corner invasion entirely, merely makes it less profitable, but has more effect on the side. If Black does decide to close the corner, it's usually with b after he already has c or e in place, or, more rarely, with d, especially if he somehow happened to get a stone a bit further away on the lower side, around the circle-marked points. You also see f sometimes when Black already has a stone around c or e and White has made an approach on the left side.


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