[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Referenced by
BigQuestionMark

 

Big Question Mark Problem 6
   

[Diagram]
Diag.: Could black live?

White next. I am confused if there's a difference between white at 2-line or not.



[Diagram]
Diag.: Guess 1

I played at a real war. Double live.


[Diagram]
Diag.: The second type

Black dead, I guess.


--Leonard Huang (17k)



[Diagram]
Diag.: Why not trying here? This seems much simpler! Alain (4D)


[Diagram]
Diag.: Variation2

But if black plays like this??

Leonard.



There is no way Black could make two eyes in this shape, black doesn't have enough space (only four stones on the second line). You need at least five stones on the second line to make two eyes. The only thing black has is a ko threat.

[Diagram]
Diag.: At least five stones on the second line for making two eyes!




[Diagram]
Diag.: Only a ko threat!

The marked stone threatens to make a secone eye with the throw in tesuji of 1. If white captures, black can play 3 and white can't connect because of a shortage of liberties (damezumari). This is because of the special properties of the corner and a good illustration of the go proverb "Strange things happen at the point 1-2" (see also StrangeThingsHappenAtTheOneTwoPoint). So, when black plays the marked stone, white has to play at 1 or a if she wants to kill the group.

    -- Alain Wettach 4D (Europe)


This is a copy of the living page "Big Question Mark Problem 6" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.