Fujitsu17YiWang/RightUpperCorner

Table of diagrams Moves 8-10 Rin - Ch'oe 2004-03-21 Rin - Ch'oe 2004-03-21 (cont.) Rin - Ch'oe Variation on Move 27 Rin - Ch'oe Variation on Move 27 (White hane) Moves 11-20 Moves 21-28 Korean baduk magazine 1 Korean baduk magazine 2 Comparable situation

Index of sub-pages Fujitsu 17 Yi - Wang Discussion FusekiBottom FusekiTop HotOpening Lower Right Status MovesBeyond120 Moves To 120 Moves To 30 Moves To 60 Moves To 90 OYoseStartingFrom151 RightUpperCorner Small yose - starting from 201

Moves 8-10  

HolIgor: is a joseki move. Black chooses .

Problem 1. What are other common answers? Dave I think there are no other answers worth considering here. is perfect for connecting and .

HolIgor: A push finishes this diagram.

Dave Three weeks earlier (in the 3rd CSK Cup) Rin Kaiho played White against Ch'oe Ch'eol-han.

Rin - Ch'oe 2004-03-21  

Dave: Without the exchange of approach move and pincer in the lower right they played a normal "Meiji Title" joseki in the upper right. here is the usual play. When Black jumps toward the edge with , White pushes with 9 and Black has to answer at 10.

Rin - Ch'oe 2004-03-21 (cont.)  

Dave: Play continued as shown. When White plays 1 the corner is safe because capturing the marked stone and playing the hane at a are miai. Black turns away to play 2 on the right and the 3-6 exchange on the top are quite normal. White used his sente to play in the lower left and Black naturally enclosed the lower right.

Yi's push at 10 in the game we are studying changes the situation in the upper right corner. Once White pushes Black out along the top, Black's jump to the edge becomes more severe because Black need not give White the opportunity to capture the marked stone in the Rin - Ch'oe game. We can see why Yi took the opportunity to slide out along the top. Could Black have prevented this?

Rin - Ch'oe Variation on Move 27  

Dave: What if Black had continued to push with 27 at here? If White answers at 2 and Black jumps to 3, the push at 4 achieves nothing. If , Black hanes and connects on the right in sente. After this Black a threatens to kill the corner (in the same way as shown below) so White must answer again. Is this enough compensation for making White stronger in the center and leaving a gap around ?

Rin - Ch'oe Variation on Move 27 (White hane)  

Dave: What happens if White switches from the block to the hane and connection here? Is the aji on the right bad enough for Black that he must be worried here? Is there a killing tesuji? (Obviously Wang did not think so but it doesn't mean that we can figure out why not :-) If necessary can Black play b and expect White to answer again at c?

Moves 11-20  

HolIgor: After black retracts with white has to think about connection. Yet the connection should be shapy. tries to achieve this. See here for analysis.

Dave: looks heavy to me. There are few examples of it in the databases but its record looks poor. Is Black trying too hard? Or is it that with the marked stone on the board already Black can afford to play harder?

HolIgor: - are joseki stuff. Gobase contains another game form 1973 in which the same corner variation was played. White won then. Black could have chosen a hane instead of . Was from the game too bad already?

Moves 21-28  

HolIgor: My impression is that this is very good for white. White got a corner and the floating group in the center is quite strong.

DJ: Hullo everybody! I've been enjoying these analysis a lot, when just the other day a Korean friend of mine brought me a Korean monthly baduk magazine, where this game is commented. Unfortunately I cannot read it, but I can watch the figures...
I can copy the diagram as they are, and we can see if they suggest us anything...
Now, the first diagrams offered are an alternative for (white 24): a NidanBane! (But maybe this is just to confute such a possibility...)

Korean baduk magazine 1  

Korean baduk magazine 2  

DJ: Does it look better for Black than in the game?

Looking hard between the Korean characters, it seems to me that the magazine suggests that if White plays at in the first diagram, then Black plays at , White plays a, Black b.
Again, if White plays at c ( in the second diagram), then Black plays c. I cannot decipher the following comment, but it seems dangerous for White, doesn't it?
More to follow...

Dave: Very interesting! Consider this...

Comparable situation  

If Black had answered White 28 in the game with the attachment here and White had replied with (analysis of other replies to this is below), then - would have created a situation very similar to the alternative from the magazine review. Which is better? To my eye the shape of the White stones in the center here seems slightly better than in the alternative above. On the other hand there also seems to be less aji in the 1-space gap between the two marked Black stones than in the 2-space gap in the alternative. A toss up?

Dave: I wonder how Black felt about . It seems to make the marked stone misplaced. If the approach in the lower right were made after , Black would certainly choose something other than the marked stone, no?