Life In 19x19 http://www.lifein19x19.com/ |
|
4-4 Attach joseki http://www.lifein19x19.com/viewtopic.php?f=15&t=2167 |
Page 1 of 1 |
Author: | Numsgil [ Wed Oct 20, 2010 1:12 pm ] |
Post subject: | 4-4 Attach joseki |
This is the joseki I have in mind: I get the flow of the joseki. Black and white trade off making poor shape. Has a certain ugly beauty to it. What I don't get is what white gets in compensation for black's now huge corner. White has nice side influence, but black has gotten apparently the entire corner and, if the joseki continues like this: Black has apparently 4th line territory and the corner. Black seems to get way too much out of this. This other attach 4-4 joseki has similar issues for me: Compare with this "classic" super vanilla 4-4 joseki that ends in gote for black. I greatly prefer white in this last joseki than in the two previous. Black has a bit nicer position, but not overwhelmingly so, since there are weaknesses that can be invaded later (such as 'a'), and black should expect a slightly nicer position since he moved in the area first. I use this joseki as a measuring stick to get an idea of what I should expect from an approach against the corner when I play: there are two sides, center influence, and corner territory to share. Black and white share corner territory, white makes a solid position on one side, and black gets a bit of center influence and invadable side territory. Since the attach joseki are considered joseki (and therefore even with the "vanilla" 4-4 joseki), I think I'm missing something fundamental here. Black seems to get center influence, corner territory, and side territory/influence, and white gets only side territory/influence. So something of black's needs to be less strong than I think it is for the books to balance. Is the corner invadeable? I've tried in a few games to form a tripod group invasion as white on different variations of these joseki, but I think with optimal play white can't form a tripod group that can live. I guess I feel like I really understand (grok) the "vanilla" joseki. I understand each of the moves, and I understand how they work together and how to work with and around them later in the game. With the attach joseki, I understand the individual moves (or they at least jive with my understanding of how to handle contact fights), but I don't really understand follow-up moves, aji or invasion potential later in the game, so it's all a bit of a mystery and I find myself experimenting with different approaches unsuccessfully in-game. Since white looks more solid than black (who has bad shape and is floating a tad high off the edge), I feel like there should be some big mid to late game moves for white in the area but I can't really find them. And if I do nothing the whole thing becomes black territory. |
Author: | amnal [ Wed Oct 20, 2010 2:15 pm ] |
Post subject: | Re: 4-4 Attach joseki |
Numsgil wrote: This is the joseki I have in mind: I get the flow of the joseki. Black and white trade off making poor shape. Has a certain ugly beauty to it. What I don't get is what white gets in compensation for black's now huge corner. White has nice side influence, but black has gotten apparently the entire corner and, if the joseki continues like this: Black has apparently 4th line territory and the corner. Black seems to get way too much out of this. I don't think white wants to play 1 here. Playing black's 2 and sealing him in seems more obvious. Equally, there doesn't seem much point capturing white's stone, so I think black would normally play 2 before doing so (if white saves it, that's awfully slow). However, I do see why you don't like the joseki, because I felt the same way for a long time. I really can't offer much helpful, except...you're wrong ![]() As a separate point, don't forget: You can also play like this, and it's sometimes appropriate. Now black has more aji in the corner, but white has less centre power. Quote: This other attach 4-4 joseki has similar issues for me: Compare with this "classic" super vanilla 4-4 joseki that ends in gote for black. I greatly prefer white in this last joseki than in the two previous. Black has a bit nicer position, but not overwhelmingly so, since there are weaknesses that can be invaded later (such as 'a'), and black should expect a slightly nicer position since he moved in the area first. I use this joseki as a measuring stick to get an idea of what I should expect from an approach against the corner when I play: there are two sides, center influence, and corner territory to share. Black and white share corner territory, white makes a solid position on one side, and black gets a bit of center influence and invadable side territory. Since the attach joseki are considered joseki (and therefore even with the "vanilla" 4-4 joseki), I think I'm missing something fundamental here. Black seems to get center influence, corner territory, and side territory/influence, and white gets only side territory/influence. So something of black's needs to be less strong than I think it is for the books to balance. Is the corner invadeable? I've tried in a few games to form a tripod group invasion as white on different variations of these joseki, but I think with optimal play white can't form a tripod group that can live. I guess I feel like I really understand (grok) the "vanilla" joseki. I understand each of the moves, and I understand how they work together and how to work with and around them later in the game. With the attach joseki, I understand the individual moves (or they at least jive with my understanding of how to handle contact fights), but I don't really understand follow-up moves, aji or invasion potential later in the game, so it's all a bit of a mystery and I find myself experimenting with different approaches unsuccessfully in-game. Since white looks more solid than black (who has bad shape and is floating a tad high off the edge), I feel like there should be some big mid to late game moves for white in the area but I can't really find them. And if I do nothing the whole thing becomes black territory. If black has other stones in the area, his position is really pretty strong, and it's a reasonable moyo for him to make (but invadeable by the normal methods). If he doesn't, it's another position that I know is wrong but cannot describe why, other than in the 'try it a lot and see' way. Basically, I suppose, black has a lot of stones surrounding not that much territory (since white can still approach the other side) and some aji in the corner, especially with the big endgame hane-connect. |
Author: | Joaz Banbeck [ Wed Oct 20, 2010 2:17 pm ] |
Post subject: | Re: 4-4 Attach joseki |
This is no good for black. Move 7 is way too small. Black would do way better to play this: And if black does play it, white would be better like this: EDIT: this may be wrong. See next post. |
Author: | gowan [ Wed Oct 20, 2010 2:45 pm ] |
Post subject: | Re: 4-4 Attach joseki |
W1 is considered "necessary" in joseki books. If White omits W1 and plays at the B2 point, then black's hane at a is considered good enough. Basically Black's corner is not as good as it looks. There is a ko at the marked point. If White takes and Black connects he has played seven moves to get less than 20 points of territory. Not very efficient at 3 points per move. WHite's thickness toward the center and the right side is worth close to 20 points. If White can enlarge the ko by atari on the stone above W1 then the corner is in danger so the ko is, at the right time, a serious problem for Black. Kobayashi Koichi used to play the attach-and-block joseki a lot in the late '80s, early '90s. Takemiya used to scoff at it as too slow. Anyhow, try it and see what happens. |
Author: | gowan [ Wed Oct 20, 2010 2:58 pm ] |
Post subject: | Re: 4-4 Attach joseki |
I greatly prefer white in this last joseki than in the two previous. Black has a bit nicer position, but not overwhelmingly so, since there are weaknesses that can be invaded later (such as 'a'), and black should expect a slightly nicer position since he moved in the area first. I use this joseki as a measuring stick to get an idea of what I should expect from an approach against the corner when I play: there are two sides, center influence, and corner territory to share. Black and white share corner territory, white makes a solid position on one side, and black gets a bit of center influence and invadable side territory. Since the attach joseki are considered joseki (and therefore even with the "vanilla" 4-4 joseki), I think I'm missing something fundamental here. Black seems to get center influence, corner territory, and side territory/influence, and white gets only side territory/influence. So something of black's needs to be less strong than I think it is for the books to balance. Is the corner invadeable? I've tried in a few games to form a tripod group invasion as white on different variations of these joseki, but I think with optimal play white can't form a tripod group that can live. .[/quote] There are lots of ways for White to deal with this black formation. In fact, some joseki books recomment playing as here: with W6 one line to the right. This eliminates the invasion at the a point. If W6 is below the side star point as in this diagram: Wb at the right time is sente. If Black block at Bc then White can cause trouble at the d points. Finally attaching at We is often an effective move. |
Author: | shapenaji [ Wed Oct 20, 2010 3:36 pm ] |
Post subject: | Re: 4-4 Attach joseki |
also, bear in mind, that's not the only option that white has, This is another one (usually you want some support on the topside.) |
Page 1 of 1 | All times are UTC - 8 hours [ DST ] |
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group http://www.phpbb.com/ |