Difficulty: Advanced   Keywords: Joseki
Fig 1. Why not joseki?  

With W1 through B4, White helps Black secure the corner.

Does White gain anything in compensation? It seems not. Black can play a and White will have to protect at b eventually.

Fig 2. Usual joseki  

This is the usual joseki.
(See 44PointOneSpaceLowPincerOnePointJump).

With B3, the corner seems protected now. By not exchanging a for b and c for d before W2 (as in the previous diagram), does White leave some aji in the corner? What, exactly is the aji? Can White live or create a ko directly? Or is some additional preparation needed?

Charles I'd say that White's giving up the chance to peep at p here was quite serious as a loss.

Fig. 3 Also joseki?  

I've also seen this sequence in books, though I may be confusing it with a similar 3-4 point pattern.

In any case, the push at B1 followed by the attachment at B3, permitting W8 is bad for black as the B1 stone becomes a wasted move. But, is the exchange of W4 for B5 and W6 for B7 bad for white, eliminating corner aji?

Fig. 4 The 3-4 pattern  

This sequence is discussed in Ishida's Joseki Dictionary. Again, the push at B1 followed by B3 is bad.

If Black wishes to play B3, he should do so immediately. Permitting W8 is a loss for Black. When this sequence is discussed, however, the exchange of W4 for B5, W6 for B7 is considered good for White. Why? Was there no significant corner aji anyway?

Charles Here, Black is simply inconsistent and ends up having made a bad exchange B1/W2.

SnotNose So the sequence in either Fig. 3 or Fig. 4 is okay for white? Or, is white still better off not helping black secure the corner and leaving the aji of p in Fig. 3? That is...

Fig. 5 The right way for white?  

In Fig. 5, Black plays inconsistently with B1 followed by B3. White does not make the a/b and c/d exchanges so as to leave the aji of the peep of p for later. Note the difference between Fig. 5 and Fig 4. When the joseki is played out from a 3-4 point beginning, White plays differently.

Fig. 6 Follow-up  

Charles Since B1 is a connection to the black+circle stones (with only a slight amount of aji remaining for White), I don't think White should permit it.

Trying not to lie with tewari, I do think Black has made a mistake here (Fig.3), and White need not regard any aji keshi to take advantage with regret.

SnotNose I have noticed that there is a lot of confusion about the correct order of play in these types of joseki, which one might lump together under the general title 34Or44LowApproachOnceSpaceLowPincerJumpPress? or some such.

About this joseki  

Dieter: B1 came in a club game, wand we discussed this variation. If White replies at W3 instead, she becomes heavy and the cut is bothersome. However, we found it difficult to evaluate this position.


If we analyse it from a global point of view, we could argue that black+circle declared the top to be important. Hence, the black+circle-W2 exchange probably hurts Black more than the B1-white+circle exchange hurts White.


If we compare to this variation, where B3-W4 is awful, W2 prevents the connection underneath at a.


I was wary of B5. I guess White can avoid all trouble and play W6. Black is now very low, White has sente and influence towards top side and centre.

Still, one could regard Black's corner as big. That's the point I'd want to investigate further : how invasion-prone is the corner ? What's the value of the peep at p ?


Hmmm, this doesn't really work for Black

BQM426 last edited by MrTenuki on July 9, 2006 - 01:51
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