BQM 30

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  Difficulty: Expert   Keywords: Joseki, Question

I (IGS 2k*) played a five-stone handicap game against a local 5 dan, and he decided to play a rather nasty move in a corner sequence. I could of course have chosen a simpler variation myself, but his move W4 was a real curve ball (although anything outside Ishida is always hard for me). We briefly analyzed the corner after the (very short :) game, but couldn't really come up with anything good for Black.

[Diagram]

Difficult joseki or trick sequence?



The game continued something like this:

[Diagram]

Game continuation

I didn't want to play B5 for obvious reasons, but couldn't find better moves at that time.

[Diagram]

Black a and b interesting points?

Now I am thinking of something like Black a to protect against the cut and the ladder, and perhaps at b to threaten to capture the marked stones.



But the move order (and the right moves as well :) is not clear. It is clear that B5 in the previous diagram was bad - I knew it when I played it, but couldn't really figure out anything better either.

Any ideas anyone? (Or preferably a clearcut solution :)


[Diagram]

Solved?



I analyzed the position a bit more myself and and came to a conclusion, that Black must cut, since in the (Ishida) joseki variations White defends the cutting point.

[Diagram]

Solved? (continued)

After these moves it looks like Black has to sacrifice the black+square stones?



Corner life and death is not my forte, so... (White plays W2 to reduce the number of liberties of the three black stones).

[Diagram]

Solved? (continued 2)

I fail to see how Black could live with the black+square stones, so perhaps the following is best Black can do. At least he is very thick.




[Diagram]

Not solved?

Funny how the mind works, now I see the interesting move of B5, and who knows where that will lead...aaargh... I guess I'll never be more than a 2k*...



Ah, this seems to be the best for Black, and bad for White. Finally. I have come to this conclusion but unfortunately the full solution is too long to be included in the margin and it is already past 3 a.m. local time, so perhaps I'll just say that I came to the 2k* conclusion that White cannot now play at b; and a gives Black a magnificent result. Work out the variations by yourself, I am too tired.

[Diagram]

Not solved? (continued)

I don't see what 'magnificent result' you are seeing after W1.



There are a few variations here, but all of them end with White capturing the three stones, and Black having more cutting points than he can handle.


Bill Spight:

What is wrong with the simple solid connection?

[Diagram]

Difficult joseki or trick sequence? (A1)



After Black connects, W2 goes after Black's stones, and now B3.

[Diagram]

Difficult joseki or trick sequence? (A1a)



This is a typical continuation. Black retains aji in the corner.

[Diagram]

Difficult joseki or trick sequence? (A2)



W1 takes with good aji, but loses sente.

[Diagram]

Difficult joseki or trick sequence? (A3a)



If W1 - W3 take two black stones, B4 is too good.

[Diagram]

Difficult joseki or trick sequence? (A3b)



If W3 threatens Black's stones, Black is happy to make a deal with B4.


Sazn: This is a Trick play used in handicap games a lot.
(Robert Pauli: Straightened out numbering and cut off right side.)

[Diagram]

Moves 1 to 10

[Diagram]

Moves 11 to 20

Robert Pauli: W8? B9? W8 could be at W10 right away. B7 one lower would prevent geta on the outside, even if it suffers from White coming in at 2-2 later.

[Diagram]

Moves 21 to 26


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This is a copy of the living page "BQM 30" at Sensei's Library.
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