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RTGProblem17

 

Attempts RTG 17
   

[Diagram]
Black kills

JoelR: ... and a picks up.
B1 limits White's eyespace, and forces W2. B3 threatens to cut at W4. If W6 at a, then B7 at W6, and Black has more liberties.


[Diagram]
Approach Ko

Dieter: If W6 here, B7 starts an approach ko (B9 at a), which is favorable for Black.


[Diagram]
Seki

If B7 here instead, W8 makes it a seki.


[Diagram]
Kill

W6 would be a mistake. Black throws in and wins the capturing race by one liberty.


[Diagram]
Failure

If Black wants to avoid the approach ko, he could make the placement of B5 but W6 is as vital a point:


[Diagram]
Seki again

White lives with seki. She can also play W2 at W3, if a direct ko is what she wants.



[Diagram]
Dieter's solution

... but in my opinion, this is the solution. It's almost the same as the earlier approach ko solution, but Black can have White play one more ko-threat. In other words, B7 will count as a ko-threat.


[Diagram]
Order of moves

The order of play can be reversed.


Bill: Well, it can be reversed, but . . . .

[Diagram]
Order of moves




[Diagram]
Caution

If W2 and W4, B5 is essential.


[Diagram]
Miai

In this variation, a and b are miai to kill.



[Diagram]
Black kills

Bill: I think this is the right third move.

There are several variations.


[Diagram]
var. 1

[Diagram]
var. 2

[Diagram]
var. 3

[Diagram]
var. 4

[Diagram]
var. 5






This is a copy of the living page "Attempts RTG 17" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.