4-4 Joseki/position question for study.

For lessons, as well as threads about specific moves, and anything else worth studying.
Post Reply
User avatar
Apoah
Dies with sente
Posts: 83
Joined: Wed Oct 06, 2010 6:43 pm
Rank: KGS 7k
GD Posts: 0
KGS: Apoah
Has thanked: 34 times
Been thanked: 15 times

4-4 Joseki/position question for study.

Post by Apoah »

Hi All,

This is my first post and I hope to be an active member. The following is from a recent game. I feel that white 9 is wrong. I replied at X but feel there may have been a better reply. What are you thoughts on this position?



Click Here To Show Diagram Code
[go]$$B
$$ ------------------- |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . 4 . . . . . . . . . . . 1 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . x . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 6 . . . . . . . . . . . . . . . . |
$$ | . . . . . 9 . . . . . . . . . . . . . |
$$ | . . . 2 . . . . . . . . . . . 3 . . . |
$$ | . . 8 . . 5 . . . . . . . . . . . . . |
$$ | . . . 7 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -------------------[/go]
amnal
Lives in gote
Posts: 589
Joined: Fri Apr 23, 2010 10:42 am
Rank: 2 dan
GD Posts: 0
Been thanked: 114 times

Re: 4-4 Joseki/position question for study.

Post by amnal »

Apoah wrote:Hi All,

This is my first post and I hope to be an active member. The following is from a recent game. I feel that white 9 is wrong. I replied at X but feel there may have been a better reply. What are you thoughts on this position?



Click Here To Show Diagram Code
[go]$$B
$$ ------------------- |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . 4 . . . . . . . . . . . 1 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . x . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 6 . . . . . . . . . . . . . . . . |
$$ | . . . . . 9 . . . . . . . . . . . . . |
$$ | . . . 2 . . . . . . . . . . . 3 . . . |
$$ | . . 8 . . 5 . . . . . . . . . . . . . |
$$ | . . . 7 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ -------------------[/go]


Black 9 is certainly not normal. The reason is, it is a building move with no foundations - this kind of building usually just falls down. If you fancy it, you can easily play a wedge or similar on that side now, and it will not be obvious how white's influence play is helping him.

You won't get a bad result by tenukiing - The worst black can do is make a normal shape on the side, giving you 2 moves elsewhere. Playing x like you did seems solid but slow. This way is disappointing if there is a way to take advantage of black's move, but wouldn't be game losing.

I checked pro games for this shape out of interest (though obviously it doesn't occur much). In the games most similar to this one, the peep at black's jump was popular. I believe this is because black can aim to immediately take advantage of black's shape to make a group on the side and leave white in bad shape. This seems worth a try if you fancy there playing straight away.
User avatar
Joaz Banbeck
Judan
Posts: 5546
Joined: Sun Dec 06, 2009 11:30 am
Rank: 1D AGA
GD Posts: 1512
Kaya handle: Test
Location: Banbeck Vale
Has thanked: 1080 times
Been thanked: 1434 times

Re: 4-4 Joseki/position question for study.

Post by Joaz Banbeck »

To answer that, we should ask ourselves why it is wrong.

We could answer with the unimaginative, rote-memory reply of: "joseki is I3, therefore anything else is bad". Or we could be more oriented toward priciples and proverbs, and not that getting eye space for a group early is a good thing, especially when the group is 60% of the stones that one has on the board. Either way, we know that he should have played I3 or nearby.

There is a proverb that says that "the enemy's good point is also mine." If it is good for him, it is good for me. The logic therein is obvious: if I take it, I prevent him from doing so. In other words, we want to play this:

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . 4 . . . . . . . . . . . 1 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . x . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 6 . . . . . . . . . . . . . . . . |
$$ | . . . . . 9 . . . . . . . . . . . . . |
$$ | . . . 2 . . . . . . . . . . . 3 . . . |
$$ | . . 8 . . 5 . . W . . . . . . . . . . |
$$ | . . . 7 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------[/go]


Amnal's comment about the peep suggests that we could also play it high, and if white tries the classic joseki, we get to wall him in, like this:

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . O . . . . W . . . . . . X . . . |
$$ | . . O . . X . . 2 . . . . . . . . . . |
$$ | . . . X . . . 3 1 4 . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |--------------------------------[/go]


...because 3 cannot go the other way:

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . O . 5 4 . W . . . . . . X . . . |
$$ | . . O . . X . . 2 . . . . . . . . . . |
$$ | . . . X . . . 6 1 3 . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |--------------------------------[/go]
Help make L19 more organized. Make an index: https://lifein19x19.com/viewtopic.php?f=14&t=5207
User avatar
Apoah
Dies with sente
Posts: 83
Joined: Wed Oct 06, 2010 6:43 pm
Rank: KGS 7k
GD Posts: 0
KGS: Apoah
Has thanked: 34 times
Been thanked: 15 times

Re: 4-4 Joseki/position question for study.

Post by Apoah »

Thanks for your replies. It is helpful to know that my instincts were right and I shouldn't have been afraid to play on the other side.
Life is what you make of it, as long as you live.
User avatar
Joaz Banbeck
Judan
Posts: 5546
Joined: Sun Dec 06, 2009 11:30 am
Rank: 1D AGA
GD Posts: 1512
Kaya handle: Test
Location: Banbeck Vale
Has thanked: 1080 times
Been thanked: 1434 times

Re: 4-4 Joseki/position question for study.

Post by Joaz Banbeck »

BTW, it might be a good play if black had massive strength in the lower left, like this:

Click Here To Show Diagram Code
[go]$$Wc
$$ |-------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . 4 . . . . . . . X O . . |
$$ | . . . . . X . . 3 . . . . . . X O . . |
$$ | . . . O . . . . . . . . . . . X O . . |
$$ | . . O . . X . . 1 . 2 . . . . X O . . |
$$ | . . . X . . . . . . . . . . . X O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |--------------------------------[/go]


...in which case white cannot play on the lower side without getting in trouble.
Help make L19 more organized. Make an index: https://lifein19x19.com/viewtopic.php?f=14&t=5207
User avatar
topazg
Tengen
Posts: 4511
Joined: Wed Apr 21, 2010 3:08 am
Rank: Nebulous
GD Posts: 918
KGS: topazg
Location: Chatteris, UK
Has thanked: 1579 times
Been thanked: 650 times
Contact:

Re: 4-4 Joseki/position question for study.

Post by topazg »

I think Black can get more than Joaz's suggestion of sliding underneath, although that is a solid corner joseki. For me, the following both look fine for Black.

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 7 . . . . . . . . . . . . . . . . |
$$ | . . . . . 5 . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . 3 . . . . . . . . . . . . . |
$$ | . . . O . . . . 4 , . 6 . . . X . . . |
$$ | . . 2 . . X . . . . . . . . . . . . . |
$$ | . . . 1 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . 6 . . b . . . . . . . . . . . . . |
$$ | . . . . . . . . 9 . . . . . . . . . . |
$$ | . . . . . 5 . . . . . . . . . . . . . |
$$ | . . O . . . . . 8 . . . . . . . . . . |
$$ | . . . . . 3 . . . . . . . . . . . . . |
$$ | . . . O . . . . 4 , . 7 . . . X . . . |
$$ | . . 2 . . X . . . . . . . . . . . . . |
$$ | . . . 1 . . . . a . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------------------------[/go]


:b9: feels thin, but it's connectivity isn't important. "a" and "b" aren't going away, so the purpose is to make White uncomfortable and play to seal. :b7: in the second dia works nicely from the lower right, and I'd treat it the same as the common pincer "mistake":

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 4 . 3 . . a . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 2 . 1 . . 0 . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O , X . . W . , 9 . . . . X . . . |
$$ | . 6 5 7 . . . . . . . . . . . . . . . |
$$ | . 8 . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------------------------[/go]


After "a", White is considered to have a bad result IIRC.


It feels like White should be able to punish it a bit, and I think going too close to Black's stones risks ending up too close to thickness. What would I do instead?

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . 3 . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . 2 . . X . b . . 4 . . a . . . . . |
$$ | . . . 1 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------------------------[/go]


"a" and "b" are miai, and I feel Black cannot pressure White, so 3 has become purposeless:

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . O . . X . 2 . . O . 1 . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------------------------[/go]


Black still has to fear the 3-3 invasion in the lower right, and now has a weak running scared group. White is mostly settled already.

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . 6 . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . 3 . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . O . . X . . 1 . O . . 2 . . 5 . . |
$$ | . . . X . . . . . . . . . . . 4 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------------------------[/go]


:b1: Feels fine in this latest diagram, but the original jump out now just looks small and ineffective, giving Black an inefficient feel. Moreover, :w2: and :w4: settle White nicely with some points in sente, and give White the initiative to approach the next corner.
User avatar
Apoah
Dies with sente
Posts: 83
Joined: Wed Oct 06, 2010 6:43 pm
Rank: KGS 7k
GD Posts: 0
KGS: Apoah
Has thanked: 34 times
Been thanked: 15 times

Re: 4-4 Joseki/position question for study.

Post by Apoah »

Does A represent any significant weakness for White?

A is C8.

I don't know why, but I can't get the go diagram to work. I copied Graham's code but it just made a blank page. Maybe this is a common mistake I am making that someone can point out?
Life is what you make of it, as long as you live.
User avatar
topazg
Tengen
Posts: 4511
Joined: Wed Apr 21, 2010 3:08 am
Rank: Nebulous
GD Posts: 918
KGS: topazg
Location: Chatteris, UK
Has thanked: 1579 times
Been thanked: 650 times
Contact:

Re: 4-4 Joseki/position question for study.

Post by topazg »

Weakness? Yes. Significant? A little, but less so with a White stone in the top left (as Black taking it doesn't also threaten to build a moyo).

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . 7 O . . . . . . . . . . . . . . . . |
$$ | . . 5 6 . X . . . . . . . . . . . . . |
$$ | . 3 . O . . . . O , . O . . . X . . . |
$$ | . 4 O . . X . . . . . . . . . . . . . |
$$ | . 2 1 X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------------------------[/go]


that's the bad aji threat, so it's not insignificant...

(Try to post an image, and if it doesn't work, I can try to have a look at what you didn't do right. The "show diagram code" should give you exactly what you need, so I don't know why it didn't work)
Kirby
Honinbo
Posts: 9553
Joined: Wed Feb 24, 2010 6:04 pm
GD Posts: 0
KGS: Kirby
Tygem: 커비라고해
Has thanked: 1583 times
Been thanked: 1707 times

Re: 4-4 Joseki/position question for study.

Post by Kirby »

In my opinion, it is OK to wait to see what you want to do on the bottom side, until the game develops more. The board is very open, and you don't know what will happen everywhere else.

You don't have to dive into the bottom immediately, I think.

EDIT: The good thing about waiting is that you can play appropriately, based on how the game changes. Since the bottom doesn't seem urgent to me, it seems better to wait.
be immersed
User avatar
Dusk Eagle
Gosei
Posts: 1758
Joined: Tue Apr 20, 2010 4:02 pm
Rank: 4d
GD Posts: 0
Has thanked: 378 times
Been thanked: 375 times

Re: 4-4 Joseki/position question for study.

Post by Dusk Eagle »

Apoah, sometimes when you copy a Go Diagram it gets indented when you paste. This causes the Go diagrams to fail. This is probably your problem. When highlighting the text of a Go diagram, make sure not to select any further than the '[' in the [go] tag, and it should work. Alternatively, it seems to work better if you click "Post a reply", then scroll to the bottom of the page where it says "Topic review" and copy-paste a diagram from there.
We don't know who we are; we don't know where we are.
Each of us woke up one moment and here we were in the darkness.
We're nameless things with no memory; no knowledge of what went before,
No understanding of what is now, no knowledge of what will be.
User avatar
Apoah
Dies with sente
Posts: 83
Joined: Wed Oct 06, 2010 6:43 pm
Rank: KGS 7k
GD Posts: 0
KGS: Apoah
Has thanked: 34 times
Been thanked: 15 times

Re: 4-4 Joseki/position question for study.

Post by Apoah »

topazg wrote:Weakness? Yes. Significant? A little, but less so with a White stone in the top left (as Black taking it doesn't also threaten to build a moyo).

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . 7 O . . . . . . . . . . . . . . . . |
$$ | . . 5 6 . X . . . . . . . . . . . . . |
$$ | . 3 . O . . . . O , . O . . . X . . . |
$$ | . 4 O . . X . . . . . . . . . . . . . |
$$ | . 2 1 X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------------------------[/go]


that's the bad aji threat, so it's not insignificant...

(Try to post an image, and if it doesn't work, I can try to have a look at what you didn't do right. The "show diagram code" should give you exactly what you need, so I don't know why it didn't work)


So w is dead here?
Life is what you make of it, as long as you live.
User avatar
Harleqin
Lives in sente
Posts: 921
Joined: Sat Mar 06, 2010 10:31 am
Rank: German 2 dan
GD Posts: 0
Has thanked: 401 times
Been thanked: 164 times

Re: 4-4 Joseki/position question for study.

Post by Harleqin »

Apoah wrote:So w is dead here?


He is in trouble, but that sequence is not forced. I think that splitting the lower side is better at L3. Anyway, White can always answer :bc::

Click Here To Show Diagram Code
[go]$$Wc
$$ |-------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . B . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . O . . X . . . . W . . . . . . . . |
$$ | . . 1 X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------------------------[/go]


It is not clear whether :bc: or :w1: is bigger, so White should not fear this. You can say that :w1: and an extension to the side are miai.
A good system naturally covers all corner cases without further effort.
mitsun
Lives in gote
Posts: 553
Joined: Fri Apr 23, 2010 10:10 pm
Rank: AGA 5 dan
GD Posts: 0
Has thanked: 61 times
Been thanked: 250 times

Re: 4-4 Joseki/position question for study.

Post by mitsun »

Joaz Banbeck wrote:...There is a proverb that says that "the enemy's good point is also mine." If it is good for him, it is good for me. The logic therein is obvious: if I take it, I prevent him from doing so. In other words, we want to play this:

Click Here To Show Diagram Code
[go]$$Bc
$$ |-------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . 4 . . . . . . . . . . . 1 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . x . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 6 . . . . . . . . . . . . . . . . |
$$ | . . . . . 9 . . b . . . . . . . . . . |
$$ | . . . 2 . . . . . . . . . . . 3 . . . |
$$ | . . 8 . . 5 . . W . . a . . . . . . . |
$$ | . . . 7 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------[/go]

I don't think the suggested W move is a good answer to the B jump. B will be happy to attack somewhere around a, preventing the W stone from making a base. If W then jumps to b, we get a running fight, and it is not clear who is ahead. Perhaps more important, the B stone at F5 looks well placed for this fight.

A better strategy I think is to try to make the stone at F5 become inefficient. W can make a more distant approach, letting B make a narrow base if he wants. For example,

Click Here To Show Diagram Code
[go]$$Wc
$$ |-------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . 6 . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . 5 . X . . . |
$$ | . . O . . X . . 2 . 1 . . 3 4 . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------[/go]

If B plays like this, the stone at F5 seems redundant and inefficient. The W position is not ideal either, but he has broken up the lower side and has sente, so I think W can be satisfied with this result.

Click Here To Show Diagram Code
[go]$$Wc
$$ |-------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . X . . . |
$$ | . . O . . X . 3 . . 1 . 2 . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ |-------------------[/go]

B could also approach from the other side, but then W gets a comfortable base, and again the B position looks awkward.

I don't think any of these continuations constitute a clear refutation of the joseki mistake, so W could also ignore the bottom side for now. It does not look like B has a follow up which W has to worry about.
Post Reply