Watari / Keima Watari Lines

Sub-page of Watari

The original diagram

[Diagram]

Keima watari

aLegendWai: After white+circle, W is safely connected (unless the surrounding areas change!).


Why the cut is impossible

aLegendWai: I am going to show all possible attempts to cut. If you are unsure why Keima watari can ensure the connection. It is worth reading on. I will show both the correct and wrong responses. So weaker players can avoid the wrong ones.

[Diagram]

Attempt to cut 1 - wrong response



[Diagram]

Attempt to cut 1 - correct response

It is the best B can do. W2 is an example of dropping back. See dropping back for details.



[Diagram]

Attempt to cut 1 - B's forceful cut is no use


[Diagram]

Attempt to cut 2 - wrong response



[Diagram]

Attempt to cut 2 - correct response

If Black a, then White b.
If Black c, then White d.
If Black d, then White c.


[Diagram]

Attempt to cut 3 - wrong response (A)



[Diagram]

Attempt to cut 3 - wrong response (B)

The purpose of W2 is to try to block B's connection by a ladder. However there's another sure-fire way to ensure the connection.

Note: W cannot capture B4 by a net. It is because B7 cannot played at "a".



[Diagram]

Attempt to cut 3 - correct response



[Diagram]

Attempt to cut 3 - a clamp is no use


This is a copy of the living page "Watari / Keima Watari Lines" at Sensei's Library.
(OC) 2009 the Authors, published under the OpenContent License V1.0.
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