[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Referenced by
OngoingOneMovesOn...
OngoingGame1

 

Ongoing Game 1 Moves 1 To 37
   

Opening maneuvers, joseki questions in the lower right and upper left

[Diagram]
Diag.: 'Group Rengo' : Moves 1-10

5: Black 5 both extends from 3 and is a kakari to 2

6: Indicates that white wants a calm fuseki. A pincer around 'a' would have been possible as well.

7: Black 7 is loosely connected to both 3 and 5 and maps out the bottom edge for black, but leaves white sente to play...

8: White plays here to stop black from playing here and making a too large moyo. Again, playing at 8 instead of one place lower indicates that white wants a peaceful fuseki.

9: Dual purpose move serves as an extension from 1 and as a pincer on 8

10: W attaches in the corner expecting to crosscut at c if B hanes at b. The usual outcome of this process will wipe out B's position along the bottom and threaten the stones on the left. B's resulting position on the right will be vulnerable to a shoulder hit against the low stone at 9. If B pushes up at c instead, W will be content to follow at b which will turn B's play at 9 into an extension against a low W position. Meanwhile B's bottom side position is still open to invasion at a..



[Diagram]
Diag.: 'Group Rengo' : Moves 11-20

11-20: This sequence was added but move numbers were not included. Is this the proper order? Seems plausible.. -- Matt Noonan

I have corrected the move order, yours gave white the option to cut at 7 at some stage. In this move order, black 9 is not joseki. Instead, attacking with black A, defending with black B or playing tenuki are the moves that are played by professionals. -- Andre Engels

To second what Andre says, B 9 is a thank you move. It provokes W 10, which strengthens White's group while weakening Black's group on the left, in exchange for very little strengthening of Black's position on the right side.

Also this may be a place for Black to avoid joseki and play something like this.


[Diagram]
Diag.: Situational variation

Black's wall works with his existing stones on the bottom. To prevent this White might start with the tsuke at 1 instead of the marked stone.

-- BillSpight



[Diagram]
Diag.: 'Group Rengo' : Moves 21-30

Matt Noonan: Would black 1 here be better played at 2 or (a) maybe? Seems like a high and wide pincer for white might be good here to reduce black's influence more that one might like? But perhaps a move like that is too slow.

Andre Engels: Black 1 and black 2 or (a) are both excellent moves. White can indeed play a pincer now, but the result need not be bad for black.

ArnoHollosi: I think that W2 was not the best choice. A tighter pincer might have been better.

MortenPahle: Why does white block at 4 and not the other side? It looks to my 10k eyes like the potential for developing the two white stones in the lower left is much larger than the potential for development of W22? Especially seeing as how approaches around the lower black group (threatening to cut 5/7) can expand the white moyo even further?

MattNoonan: It seems like if white wanted to block on the other side, he should have played a tighter pincer.. I think letting the two black stones link up is letting black off too easily, and it leaves white with a floating star stone and a wall which probably needs at least one or two more defensive moves.

ArnoHollosi: Yes, W playing at 5 would essentially make W2 a wasted move. What was the idea behind W6? That is a bad move.

AndreEngels: In my opinion, there are two reasons why white should play at 4 rather than 5:

  1. The marked stone is rather far away. If white played at 5, black could easily invade the left side, and white would not have enough possibilities to attack in a profitable way.
  2. If white plays at 5, white 2 is too far away. It does not work together with the white wall that will come into existence very well.

[Diagram]
Diag.: possible variation at the top

Arno: I was looking forward to something like this. W9 before defending at 'a' is the way to go. W builds a nice framework at the top.


[Diagram]
Diag.: White in trouble

DaveSigaty: Playing 7 straight down is the usual reaction to W 6.

Back in the game, B connects at 9 and waits to see what W will do. If W 10 he can play down at c looking toward the cut at d next. Will W connect at d to try to make something of the left side, allowing B to connect at 10?

AndreEngels: White 6 is the kind of error I always hope players will make. Because it does show that they do have a feeling for the game. Locally it is good shape (Hane at the head of two), but it has the problem that it does not work. Black 7 at 9 is perhaps more usual, but this black 7 is considered to punish white's error too. See my Joseki description at OneSpaceLowPincerInvasionInterception.



[Diagram]
Diag.: 'Group Rengo' : Moves 31-37

AndreEngels: Black 1 is Tesuji in this shape. If white extends downward to 3 with 2, black cuts with 2 and white is in troubles. White therefore has to connect at 2, but after black 3, black has gotten a small advantage in this corner, because the exchange of the marked white stone for black 3 is now AjiKeshi.

MortenPahle: Thanks for answers to my last question. Here's another one: why does black play this relatively small extension (which still leaves the corner open and is not sente) instead of an extension down the left? The left side seems to be the most important part of the Goban right now, with a large potential for white development? If black had played on the left, which would have been the best approach? Black 'a' seems too far, white might pincer with 6? Would black 6 be better?

HolIgor: My answer. Black 5 seems to be the largest move on the board at the moment (note, I was not the author of the move, but I did consider it as natural). It increases black's moyo while preventing white to create a moyo at the top. Playing on the left side seems to follow the same line, but many games show that black has a weakness in the top left corner formation which could be used to cut it off from any far stone on the side. Both a and 6 on the diagram would have to fight on their own. On the other hand with lower left corner opened white's moyo cannot get as big as black's moyo at the right side and top.

AndreEngels: Because black is already low in the top left, he cannot make much territory on the left. On the right on the other hand, he has a moyo, and any extension here makes it stronger.

BillSpight: B 7 looks awfully slow. Surely the enclosure at 'b' is better.

AndreEngels: White 10 is likely to strengthen black here, but white does not mind because she can still invade the corner.


[Diagram]
Diag.: possible variation at the top

DaveSigaty: While I agree that 1 is a good move in this shape, I can't help wondering what W would have done if B had bluntly cut at 1 here. If 2 then after 3 the ladder at 'a' does not work. If 4 then 5 looks like putting W on the spot. What do you think?

AndreEngels: You are right, according to joseki theory black 1 is also a good move, provided the ladder with white A does not work.



This is a copy of the living page "Ongoing Game 1 Moves 1 To 37" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.