Attacking a deep invasion

[jdl]

Reviewing my latest game, I came to this point where I wasn't sure that I handled it correctly. Where do you play as black and why?

[Cassandra]

K5 from above (may be also something similar, driving White to your walls either on the right, or the left).

You have massive strength on both sides, so White can get a very cramped position on the lower edge only.

If White tries to run away, you will be able to build further influence in the centre that will radiate all over the board.

[EdLee]

K5 feels very natural, but like Cassandra, I'm not sure of the exact spot.

[Celebrir]

K5 feels most natural and seems to be a good and solid move for the reasons already explained. If I would go into 'find the very best move'-mode I would go for J5. B's wall on the right seems to be bigger and more solid so I would like to push W's weak group into that direction

[Bantari]

Nobody likes K6 or even K7? With so much massive strength on both sides, there might be no need to play as tight as K5.

[Cassandra]

If you wanted to limit White to the lower edge, it would surely be better to play farther away from White's stone.

If you wanted to initiate a running battle, playing closer to White's stone, and probably from the left, in order to push to the right, might be preferable.

And it should be clear that a Black move on the third line is out of the question.

[RobertJasiek]

Since you might be too weak for accurate positional judgement, as W approach as far as possible just so that B cannot kill or profit well from attacking. As B attack from the outside if W has entered more deeply than the outer moyo hull (sector line). Therefore, for W, playing on the outer moyo hull is a good idea, and usually in the middle between the B walls. It is sometimes possible to play 1 intersection adjacent to that middle intersection of the outer moyo hull.

[Uberdude]

n17 is huge. If white gets it then next he can play r17. I might play that and let white jump to k5 as you can still cap and attack/kill it. black k5 could be -1 point in gote. Just because k3 has a black circle on it doesn't mean you need to play near it.

[quantumf]

n17 is huge. If white gets it then next he can play r17. I might play that and let white jump to k5 as you can still cap and attack/kill it. black k5 could be -1 point in gote. Just because k3 has a black circle on it doesn't mean you need to play near it.

I also wanted to suggest tenuki, because it's not clear how white can live even with a second move. It is unusual to be so incredibly strong on both sides, which is why it might be that a cap is an underplay in this particular situation.

But I think that at 8k, the cap is good, reusable advice for situations somewhat like this.

[Cassandra]

n17 is huge. If white gets it then next he can play r17. I might play that and let white jump to k5 as you can still cap and attack/kill it. black k5 could be -1 point in gote. Just because k3 has a black circle on it doesn't mean you need to play near it.

I also wanted to suggest tenuki, because it's not clear how white can live even with a second move. It is unusual to be so incredibly strong on both sides, which is why it might be that a cap is an underplay in this particular situation.

But I think that at 8k, the cap is good, reusable advice for situations somewhat like this.

Yes, when having the potential territory of both sides in mind, N17 seems to be THE move to play.

In principle, White has noteworthy territory on the upper edge only.

On the lower edge, it is not unlikely that Black will get at least as much territory as White has in both corners, even if White was allowed to play a second move there.

But:
If you ever wanted to find out what might happen after a cap (or another move nearby), the position in this game would be ideal for starting your investigations.

[jdl]

I did cap at K5, figuring that I couldn't kill the stone (it lived). My thought was to let white pick a side to escape from and profit on the other side while attacking his running group. In retrospect, I think I like J5 better since it's my weaker side.

I got N17 later. I think we both underestimated how big it was.

Thank you to everyone for the feedback and advice.

[Celebrir]

I think it would be intresting to see how W managed to live in there. At least I don't see an easy way for W to do it

[jdl]

I got N17 later. I think we both underestimated how big it was.

Ack, I take it back. I played P17 instead of N17, because I hate points or something.

[jdl]

I think it would be intresting to see how W managed to live in there. At least I don't see an easy way for W to do it

The horror show starts at move 48.

http://eidogo.com/#1YsCXubJB

[Cassandra]

Black 56:
Probably better at G5, closing the left centre.
Please remember that Go -- from its name -- is an ENCLOSING game, not a killing game.

Black 58:
G5 is a must now.
Your Black 56 has closed the right centre, so you should do the same on the left.
White will get at most about five points of territory with her group on the bottom.
This is the same as what you will get in the E5-area alone. Not to mention your potential territory in the N5-area at right.

Black 68:
Probably better Hane at G6.