OD1P - May 22 Problem / Solution

Sub-page of OD1PMay22Problem

Index of first moves

[1] O19, success

[Diagram]

Black Start


[Diagram]

Black fail

White connects, black is dead.


[3] Q19, failure

[Diagram]

failure


[4] Q18, failure

[Diagram]

Black Start


[1] PeiweiCao? Black start:

[Diagram]

Black Start

PeiweiCao? Now White has two choices:

[Diagram]

White Choice 1

Black lives.

Or...

[Diagram]

White Choice 2

[Diagram]

White Choice 2 (Continued)

One of the two blocks of White will be eaten, and Black lives.

Jared: This could be called a "double sacrifice" set-up, with a "double-snapback-threat throw in"


[3]

YongCao? I think should play B1 first, then B3.

[Diagram]

Order?


PeiweiCao? Black dies:

[Diagram]

Black Dies


PeiweiCao?: Consider white move 2 at p19 instead of m18, I believe that white p19 assures the death of the black corner.

[Diagram]

Black Start

unkx80: If W2, then the tesuji of B3 and B5 should ensure life.


Alexandros? Not a very good player here, but I think PeiweiCao?'s method fails to the following:

[Diagram]

Black Start


[Diagram]

Black Start

Then, as I read it, if black picks this path: (with move 3 filling in the liberty)

unkx80: B5 at W8?

Alexandros?: I'm not sure if it's cheating in a problem, but we could play W4 at B5 in that case, and run into the wall at the other end of the board. Of course, this goes beyond the bounds given for the problem, so it may be wrong...

unkx80: By the usual conventions in life-and-death, we assume that the rest of the board is empty, so feel free to extend the diagram as you wish, so this is not cheating.

For your question of W4 at B5, I leave it as an exercise: What is the gist of this problem? The tesuji has been mentioned on this page at least twice already...

[Diagram]

Black Start


[4] signal9 Black Start:

[Diagram]

Black Start

signal9: I'm not 100% sure, but this looks pretty good to me.

[Diagram]

Black Start

unkx80: Nah... this is a failure diagram.



This is a copy of the living page "OD1P - May 22 Problem / Solution" at Sensei's Library.
(OC) 2007 the Authors, published under the OpenContent License V1.0.
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