White has two obvious threats, the hane at a, which strengthens White's stones in the area and aims at making a framework on the bottom side, and b, which strengthens the two White stones in the center as well as the White stones in the bottom right.
The top left corner is not interesting at the moment. Which is more urgent, the center or the bottom side?
_________________ The Adkins Principle: At some point, doesn't thinking have to go on? — Winona Adkins
Which is more urgent, the center or the bottom side?
Tough to post over the weekend.
I think the centre has to be more important than the bottom corner. 9 of Black's 10 stones are on the side, but he doesn't have a sizable territory or moyo to show for it. What he does have is groups with bases and some white stones to pressure.
Originally I thought 'a', but white will just 'b' and Black's no better of. I think 'b' or 'c' is better, to split white up. The only fly(es) in the ointment are that white has both 'd' and 'e' to look forward to, so it's tough to see how a centre fight will go. It feels like the situation demands an extension in the centre, even if I can't see the follow-up.
The game was GoGoD 1786-03-12, between Yasui Sench Senkaku (W) and Suzuki Junsei. The problem position arose after Senchi played in the center, an overplay losing 13% to par, according to Elf. (Assuming no komi, OC. White often needs to overplay in a no komi game.)
Senchi played in the center, an overplay losing 13% to par, according to Elf (assuming no komi, OC). Suzuki extended on the 4th line, certainly a reasonable looking move, but one that Elf reckons loses 18½% to par. Senchi pushed with , another bad mistake which returns the favor, losing 17%, and indicates a likely mutual blind spot.
and build strength in the center by sacrificing the stone. After pushes out strongly, and continue with a driving tesuji which makes urgent and strong. OC, is likewise strong, so there is that.
and reach out for air. Then White plays the hane, , with sente and stabilizes the White group with the tesuji, , at least for now. takes sente and occupies the last empty corner. Then plays the press in the bottom left.
Once you think of it, stands out as the key point for this position, it seems to me. It weakens the two center White stones and threatens to capture the stoneuniting the Black stones and making Black very strong overall. is virtually forced. Now extends on the 4th line. The hane at 24 is also playable for . Black answers with the hane, .
shores up the White group, then projects strength on the bottom side and into the center. occupies the last open corner, and finally, nails down the right side.
OC, long variations should always be taken with a grain of salt, but I think that the value of the extension in the center for above the extension on the side is indicated, and that other top bots will agree.
_________________ The Adkins Principle: At some point, doesn't thinking have to go on? — Winona Adkins
For me, the choice between A and B gives it away because locally B looks bad. Before looking at your suggestion I was looking at C.
B can't be good because White forces C-D and then what is the marked stone doing? Black is too strong in the area to play a soft move like B. At best he plays D directly (and then White C would surely not elicit Black B)
So it must be A. But I'm interested in comparing A to the more aggressive C.
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Speculatively: Current position: 1. Ooh fighting with so many weak groups. Two points stand out N9 N4 (which helps E3) O3 N6 M5 M6 L5 N5 M2 L6 K5 ... I think this fight looks ok for B as E3 seems a bit damaged and though B is thin at Q12, I'm not sure W is getting much territory from the centre fight. However W playing P8 does expose R8 aji. But the last empty corner is also looming. 2. Or N5 O6 M4 N9 O8 N8 P8 N6 D16 (W connects cleanly with reasonable good shape which seems simply better for W but B gets the corner, so perhaps ok, but I still don't like B making the Q12 attack a more serious problem. 3. Or N4 P8 N9 N5 M4 M5 (this fight also doesn't seem that easy for either side but I feel slightly better for W.
Opp to play 1. Obviously N4 as the centre fight can't be resolved with one move as both N9 and P8 are big.
Past: 1. B's fighting locally seems slightly unreasonable to me, though I feel perhaps W's move at O11 is strange when S16 is already undercutting B. I slightly prefer W here but complicated fights are always hard to judge.
Overall: 1. I still can't really decide but I feel N5 is falling into W's trap. 2. I want to play N4, though the shape feels a bit risky, as it does seem to stay ahead of W. 3. Playing in the centre to prevent Q12 seems to be B's plan, but Q12 remains and centre moves aren't often worth that much.
Check: 1. That's a crazy looking driving tesuji but it does make sense to get the key big moves at M3 and the centre isn't that weak when B is still vulnerable to Q8 (but also doesn't want to add a move there). 2. Not accurate enough to see the driving tesuji. I didn't expect W to continue the centre fight with in the ELF mainline.
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Bill Spight
in the center, an overplay losing 13% to par, according to Elf. (Assuming no komi, OC. White often needs to overplay in a no komi game.)
, another bad mistake which returns the favor, losing 17%, and indicates a likely mutual blind spot.
build strength in the center by sacrificing the 
stone. After 
pushes out strongly, 
and 
continue with a driving tesuji which makes 
urgent and strong. OC, 
is likewise strong, so there is that. 
and 
reach out for air. Then White plays the hane, 
, with sente and stabilizes the White group with the tesuji, 
, at least for now. 
takes sente and occupies the last empty corner. Then 
plays the press in the bottom left.
stands out as the key point for this position, it seems to me. It weakens the two center White stones and threatens to capture the 
extends on the 4th line. 
nails down the right side.