OD1P - May 22 Problem / Solution

Sub-page of OD1PMay22Problem

Index of first moves

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

Black plays at N18
Black fails

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

[2]

Black Plays at P18

Mistake

Black has no continuation here

[3]

Black Plays at Q18

Black plays at Q18

Q18, Black dies in failure.

Black Start

Black lives only if White plays this sequence follishly to allowing Blace to capture at a. White can play b as , , , or even 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 , the better for Black.

Black Start

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

Black Start

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

[4]

Black Plays at Q19

Black plays at Q19
Order?

YongCao? I think should play first, then .

Black Dies

PeiweiCao? Black dies:

[5]

Black Plays at P19

Black plays at P19

[6]

Black Plays at O19

Main line

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

Variation

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

Main line (bis)

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

Whites's throw-in

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

OD1P - May 22 Problem / Solution last edited by Dieter on March 13, 2022 - 21:58