OD1P - May 22 Problem / Solution

Sub-page of OD1PMay22Problem

Index of first moves

[Diagram]

Black To Play

.. a at [1]

...b at [2]

...c at [3]

...d at [4]

...e at [5]

...f at [6] (Correct solution)


[1]

Black Plays at N18


[Diagram]

Black plays at N18

[Diagram]

Black fails

White connects, main black group is dead even if the three stones on left might escape.



[2]

Black Plays at P18

[Diagram]

Mistake

Black has no continuation here


[3]

Black Plays at Q18

[Diagram]

Black plays at Q18

Q18, Black dies in failure.

[Diagram]

Black Start

Black lives only if White plays this sequence follishly to W10 allowing Blace to capture at a. White can play b as W4, W6, W8, or even W10 to connect to White's two stones and thus kill the main Black group even if allowing Black's few stones on left to escape if they can. The longer White delays in playing b after B3, the better for Black.

[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.


[4]

Black Plays at Q19

[Diagram]

Black plays at Q19

[Diagram]

Order?

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


[Diagram]

Black Dies

PeiweiCao? Black dies:



[5]

Black Plays at P19

[Diagram]

Black plays at P19


[6]

Black Plays at O19

[Diagram]

Main line

If White comes from the inside with W2, she can't capture B5 because of the snapback. The successive throw-in of B3 qnd B5 are the tesuji here.

[Diagram]

Variation

If White comes from the other side, B5 forces W6 to capture, then connects at B7. This is more straightforward than the main line.

[Diagram]

Main line (bis)

Adding the W2-B3 exchange doesn't fundamentally alter the main line.

[Diagram]

Whites's throw-in

Likewise exchanging W2-B3 doesn't change the solution. B5 connects at W2 and then we're again at either a (main line) or b (variation)



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