I considered something like this and assumed it was fine, but that was when I assumed white 2 will be a capture of the black stone. Here, black's strange corner shape is exposed, and I'm not sure if the white stone above is good or bad for black's strategy. In which case, White should probably play 2 at 5, which is similar to diagram 1.25.
A more extreme plan may be to try to somehow find a way to separate the two groups-- this particular method doesn't seem to work, and is 1 step behind.
This type of play seems passive, and almost a copout from the challenge. As far as I know, white will at least get an aray of forcing move against the black corner, and that is completely against my strategy-- it's making white too strong.
After black a, when white connects at b black's shape is more than a little off. So, when black cut's at b, after white a, the c-d-e-f-g sequence doesn't work for black; after whit is forced into capturing the two white stones, black's only hope of surviving is cutting at h which fails when whit get the exchanges i-l.
It might be a difficult game for both, as I'm not sure if the shape is suitable for making territory-- white gains a lot of cash, but loses influence on the top and center, I hope.
_________________ On Go proverbs: "A fine Gotation is a diamond in the hand of a dan of wit and a pebble in the hand of a kyu" —Joseph Raux misquoted.
There seem to be two main options here. Solidly take the corner with 1. This seems to be sente. At least I can't find any major follow up that Black can make in the top left.
Or give up a small corner and take the outside. This one looks gote though, and although Black only gets a few points in the corner, after B "a"W doesn't seem to have much potential on either the left or the top of the board, so it seems clear that taking the corner is the best move.
It is clear after this diagram A, Black has virtually no secure points, and White has two largish corners. I think that I am the clear victor of this most recent complicated fight, but considering the length of the game, it is only a slight lead. We'll see how the game goes after this.
Whie could be trying to remove the aji from the corner-- now I think I may see. I think b would be better for black instead of a, as the aim is to secure the corner, and white doesn't much from capturing F16 (I think).
It seems too small to worry about that one white stone right now. I considered descending, and then tenuki-ing, as it is often a good idea to ad a stone if you are going to sacrifice, but I think B would just block on the right and allow me to rescue that one stone. It is better to leave some aji alive.
As for my move in the bottom left, I would have liked to do something more severe, but pretty much every move I could think of was countered by Black playing at . I might as well take it myself. I do expect a response, otherwise black's group loses its base when I extend. This way I have two large corners, whereas Black has little territory. Add to that that I have no weak groups, and might end this sequence in sente, and I think W is doing really well.
If black played at a, white would have sente and could still push at b at any point in time,or make a knights move instead for good endgame-- it seemed an unthinkable move.
Playing at b is what I expected to myself to finally choose, however on second thought, I couldn't decide whether I absolutely needed to play there or not. Of course, it's not that I don't like the move. If white strikes down at a in response to b, then black could Atari at c, forcing d, and finally take sente as white cannot cut:C7, B6, B7, B5, C4,CB.
However, I don't think white will cut at a; more likely, white will leave the are. the black group on the left seems strong to me, at least; not easy to attack outright. This also naturally incurs the consequence that the black group on the left side is a natural dilation of whites hope of using the influence in the upper left-- explaining black's play around that area. Playing around the left side seems to be an over-concentrated move which gains less than ten points, and loses initiative. However, there is one argument vouching for a black play there:
After a play at white 6, it almost feels as is we can effectively say that a ponnuki has been constructed. In this case, I somehow feel that black can effectively dilute white's influence with a play around a or a large knights move. Seemingly even better, is for black to take sente and take b as a counter towards a.
This move is also so big and I cannot say it's bad. But I feel that black has a stake in the upper side whether black plays here or not, so black should play to have power over the board.
_________________ On Go proverbs: "A fine Gotation is a diamond in the hand of a dan of wit and a pebble in the hand of a kyu" —Joseph Raux misquoted.
This seems pretty good. I think it is important to enter this area so it doesn't get too big. The top side is a bit too narrow for a safe splitting move, so the approach seems natural. So far, I am far ahead in territory, but B has created a moyo with a lot of 4th line stones, so now I need to see to limiting his potential.
After a play like , black may have that lingering sensation of feeling more could have been done. While white's group cannot be called completely secure from all pressure, it comes close enough, I somehow feel, and after white, it feels as if black had been stunned. Much of the black potential for the upper side stemming from black having a thick upper left group has evaporated.
However, black has sente and the potential to take leading developments on big points on the board, so it is hard to judge for me (as always).
The real strategy for white seems to be to erase black's high hopes of a potential on the upper side. After a strike such as a, white can coordinate with the upper left stones to even threaten to revive an influential position in the center, somewhat.
At the same time, in response I wonder if black can now push up, extend once and immediately jump to b without pushing once more--; no preparation.
I first considered the 3-3 invasion to grab a third corner. but that might make the center huge and I would be sure to lose sente. Jumping out seemed heavy so a double approach it is. I don't seee the high double approach very often, but I think it will be better for erasing potential in the center.
This seemed possible, but it does ring of something a little uninspiring for black. There is still aji around c for white to make black over concentrated on the upper side. As it stands, black's influence is wasted on conflicting strong groups. The main reason why I think it may be worth it for black to attempt for this variation is for black to keep up the attack at a, however, it is painfully s;ow from my perspective, and doesn't work at all as black needs to play around both a and b simultaneously for any pressure to realise.
_________________ On Go proverbs: "A fine Gotation is a diamond in the hand of a dan of wit and a pebble in the hand of a kyu" —Joseph Raux misquoted.
At first, I was a little unsure of where to play as a move like c reverts to the diagram in fig_1.43 I think.
I could only think of moves a and b as being possible. b seemed reasonable, as it captures white's single stone in the corner, however white's group on the outside could become rather strong, which would assist the upper side stone and have a negative effect on the right hand side.
Playing at a maybe makes the situation a little more unpredictable, as black plans to attack at d if white plays at b-- if white responds at d instead, I think black may have to simply jump to e, so the d-e exchange is one white should make before coming back to b, probably.
Instead of basing play around b, I'm sure there are fancier moves for white utilising the O17 stone!
This extension seems to be the only option if I want to make a fight of it. I am a little worried about a response at Q17. Things get complicated then, but I think I can still fight with it and get something.
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DJLLAP
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. I might as well take it myself. I do expect a response, otherwise black's group loses its base when I extend. This way I have two large corners, whereas Black has little territory. Add to that that I have no weak groups, and might end this sequence in sente, and I think W is doing really well.
, black may have that lingering sensation of feeling more could have been done.