RTG Problem 28 / Attempts

Sub-page of RTGProblem28

Tderz No problemo ... W2 - W4 technique learnt from a hamete variant of the taisha (which I never play - the taisha in general)

[Diagram]

Direct ko

Direct ko, white must search for first ko threat,

[Diagram]

Black to play.

Black has 1 internal ko threat.

If ..

[Diagram]

White wants to resist ...

[Diagram]

futile


[Diagram]

Possibility

Rich: If you start with B1 W2, why not like this?

[Diagram]

Semeai

JoelR: Now each has 3 liberties (including circle), plus the shared liberty, and it's White's move.

[Diagram]

Semeai

TDerz: I missed a lot !

[Diagram]

Semeai: White wins



[Diagram]

Possible danger?

Rich: Although it seems that the black corner is now dead. I've probably missed something...

[Diagram]

Tderz: B1 and W2 are miai. Black is dead


[Diagram]

Refute

Dieter
Rich: Black still has one eye, no?

[Diagram]

And now?

--Bill


[Diagram]

Black to play.

Tderz: All of this excellent stuff written above proofs:

  • I was indeed careless again, and
  • Black should better take care of his group:
[Diagram]

Black can't save all and lives in the corner.



[Diagram]

What if W2?



[Diagram]

Tderz If W2 above, black captures with living shape.

[Diagram]

Or, if W2 here, it reverts to some upper variations (ko).

[Diagram]

black loses, if he wants to avoid the ko


[Diagram]

Liberties

Dieter: Black cannot save his cutting stones but lures out his two stones.

[Diagram]

More

cannot resist due to lack of liberties

[Diagram]

Or ...

Or can White do even better?

DJ: This last diagram seems not so good for White:

[Diagram]

Black lives

Now either Black lives or captures also the two stones in the corner. A similar sequence happens if W2 is at a (W4 at white+circle):

[Diagram]

Black still lives


Tderz: Ode to unkx80 (what a composition) - Wahnsinn - I'm lost.
I gave several careless random shots and linger for the solution: is Black doomed on both sides??


unkx80: How embarassing... I seemed to have posted a composition that does not work. -_-

I originally have two solutions in mind.

[Diagram]

Alleged solution 1

[Diagram]

Alleged solution 2

[Diagram]

Alleged solution 2 failure

But now I think W2 kills.



Which means, I need to give Black more liberties as follows. Sorry for the blunder.

[Diagram]

Black to play.

Bill: That's OK, unkx80. Even the gods falter. :-)


This is a copy of the living page "RTG Problem 28 / Attempts" at Sensei's Library.
(OC) 2012 the Authors, published under the OpenContent License V1.0.
[Welcome to Sensei's Library!]
StartingPoints
ReferenceSection
About