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1-2 point problem 2
    Keywords: Life & Death, Problem

[Diagram]
White to play

White to play and connect her stones by capturing the three black stones in the corner. Compare this problem to the race to capture in the corner and the belly attachment.



[Diagram]
The one-two point

Play the 1-2 point closest to the stones cut off.


[Diagram]
Continuation 1

[Diagram]
Continuation 2


[Diagram]
The wrong one-two point

It is not true that any 1-2 point works. White 1 plays at the wrong 1-2 point and loses the capturing race instead.



[Diagram]
(A1) The hane leads to ko

The hane leads to ko. Please review.

unkx80: I think that Black 2 and White 3 in this diagram are wrong.


[Diagram]
(A2) White 3 in diagram A1 is wrong.

In diagram A1, White 3 can play as in this diagram, and white wins the capturing race unconditionally.


[Diagram]
(A3) The correct reply (9 takes ko at 1)?

So instead of playing at 2 in diagram A1, I think black should play at 2 in this diagram. In this case the result should be a ko.


[Diagram]
(A4) The correct reply (variation)?

If White 3 in diagram A3 is played as 3 in this diagram instead, white loses the capturing race.



I agree with your additions. I leave this a few days as it is to see if someone has still better ideas. --Dieter


Authors:



This is a copy of the living page "1-2 point problem 2" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.