BQM 256

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These questions appear in TsumegoFromGames48.

[Diagram]

White looks vulnerable


[Diagram]

What happened

Questions are:

  • Is invasion possible?
  • Is B7 right?
  • Where should B9 be?

Black tried B9 between B1 and B5, which led to a ko at [circled point] for seki, but lots of things seem to lead to ko at [squared point] for life.

[Diagram]

option to submit

zinger: Well, white can play this way, which is a little submissive but seems to give unconditional life.


[Diagram]

Different attack

Alex: Without having done any reading, this B3 looks at least as plausible as the B3 given in the game. Anyone care to suggest some continuations?

Bill: W4 is usual, no?

[Diagram]

Different attack

tderz: B3 makes miai of an attempt to live with a or cutting with b. Who would be faster?

[Diagram]

Different attack

tderz: Unfortunately, B5 is not sente, hence Black dies like this.
A semeai Bs-Wr-Bt will be won by White as Black only has 4 liberties (5-2+1),
whereas White has about 6 liberties.

If there was a black stone around p and Black could get a B8 in place, Black might think about of connecting with r ff. but this is not the case here (also all black area would be destroyed as White would most probably not die in the Black influence, but it's an interesting idea).

[Diagram]

Different attack

tderz: if B wanted to enclose with these BC and BS
(in gote: BC-W_r_-BS),
then he better could do so without [20] invading & settling the corner, I guess.

[Diagram]

Different attack

tderz: Rhetoric question: Could black resist with B7 ? (Answer: No)
The idea would be to start a semeai with the WC.
White c is an easy way to stay out of problems though.
White d or e could lead to trouble
(as they might rely on a bad atari f taking away a liberty from White and perhaps allowing for something like g+c)

[Diagram]

Different answer

Dave: I think that playing W2 here leaves black with too few liberties to fight on either side. If Black plays 3 at 4 instead, then White a. It seems that b is not even sente for Black.




[Diagram]

White kills

Bill: Instead of W8 in the game, W1 leads to an easy kill. If B4 at B5, W4 leaves Black dead.


[Diagram]

standard sequence for preserving aji

tderz: [20] This is a standard sequence for closing off the (small) side, while still preserving aji.
Wa-Bb-Wc could follow (we don't know the game constellation here, i.e. how that would affect the 5 black stones on the right). Please notice that Black never wants to give the atari m as White would be glad to connect at n
...=> and the black corner-aji at q, r would be gone. (if s.o. finds a link to an appropriate Senseis page which displays the execution of this aji p/q, pl. link)

[Diagram]

standard defense

Bill: W2 is a standard defense which might be appropriate in this kind of situation.

Alex: Yes, I think this is much better than W2 in the other diagram. The shape shown in the tderz's diagram usually arises the other way, with a kick at W2 (in tderz's diagram) coming first, followed by a Black hane underneath at B1 (an alternative to the more normal stretch upwards, when Black wants to stay light and take sente), then White blocking at the marked stone.


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This is a copy of the living page "BQM 256" at Sensei's Library.
(OC) 2007 the Authors, published under the OpenContent License V1.0.
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