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OGG2 - White Connects with 152
Keywords: Question
DaveSigaty: I thought this was a very interesting point in the game. When White played elsewhere in the actual game we moved immediately to the large yose stage. Connecting at 152 below instead leaves the situation on the right still unsettled. What happens here? Variation 1
White connects and Black takes the big point on the left, treating 1 as a forcing move. I think that White 4 is the natural play.
What happens next?
HolIgor: When taking the big decision I considered this variation and thought that White forced Black to take too many points. And here Nonny's question comes. Dieter: I think - without calculating much - that Black a makes miai of capturing White 4 and making an eye at b.
unkx80: This is a 2 am post, and a continuation from the previous diagram. Did I read wrongly?
Bill Spight: Good point, unkx80! But maybe White should make ko. (Black can live by playing
unkx80: (3 am) Hmm, thanks. I will look at this again some other time. I think I should go to sleep. =P
Bill: Thanks. I overlooked
If
Dave: Let's see! I think this is one of the main theoretical lines. The questions seems to be whether Black can find something that works after forcing moves to here. I think that a and b are miai for White to prevent both a second eye and a connection to the left.
Variation 2...
What else might Black choose after White connects? JamesA: How about this for an alternative black play?
DaveSigaty: This
Varous bits of aji remain, however. The most serious is White's descent at Remaining Aji 2
If the play on the lower right side proceeds in such a way that White does not use the descent to the edge in the previous diagram, White may choose to capture the ko in sente. Black cannot afford to let White cut at a and must answer with
6 at 1
Black seems OK in these variations, but I'd bet money that I've missed something.... Sideline question
This is just a question: Not that White wants to, but doesn't the solid connection at White 152 mean that White can put the marked stone in motion, threatening to connect directly or underneath? I'm probably missing something, but it seems to me that because of the potential atari by White at a, connection underneath is possible? Please let me know what I'm not considering. --Nonny dnerra: It seems you are right; I did not see this, and it means that Black 151 may have been a bad move:
If Black a next, White just connects at b and Black cannot cut. So Black would follow up with c, but this is gote and so White might as well get to play there. Maybe White would play this sequence after capturing at d with sente. Dieter: You know what I think ? After having read the whole discussion and considering the truckloads of aji that exist along the right side, I think Nonny was correct all the way when he questioned my move at 135 (see OngoingGame2). I also think his proposal for improvement was correct. Black 135 should have been played at 4 in Variation 1 (top of this page). Gentlemen, I take my hat off to Nonny. HolIgor: Come on, Dieter. If playing 4 was necessary then, of the two moves, 133 and 134, the latter was larger by far. I think that Dnerra, 4d, eased up a little bit on White to make the game closer. dnerra: Oops, I think you should show a little more disrespect to my rank, HolIgor! :) (Which is 3d, not 4d, by the way.) So there were three moves of mine that got particularly criticized.
But,to stress that point with the disrespect a little, I would say that I usually commit at least two blunders around this stage of every game that are worse than the mistakes listed here. If you don't believe me I will try to record them in one of my next tournaments and present them here on SL. :-) This is a copy of the living page "OGG2 - White Connects with 152" at Sensei's Library. ![]() |