Xuanxuan Qijing Problem 13 / Solution

[Diagram]
Solution is approach ko.  

The best solution for both players is to give White an approach ko, enabled by the throw-in of W3.


[Diagram]
Black captures throw-in.  

If Black captures the throw-in, then White can get another, better ko (see "Black chooses 'a' 1" & "Black chooses 'a' 2").

[Diagram]
Cont. W1-W5  

White exchanges W1 for B2 and then performs the key probe of W5. Black's reply at a, b, and c will be demonstrated.

[Diagram]
Black chooses 'a' 1.  

B7 @ 4. White makes a ko.

[Diagram]
Black chooses 'a' 2.  

White still makes ko.

[Diagram]
Black chooses 'a' 3.  

White lives unconditionally.

[Diagram]
Black chooses 'b' 1.  

White lives unconditionally.

[Diagram]
Black chooses 'c' 1.  

White lives unconditionally.


Xuanxuan Qijing Problem 13 / Solution last edited by 68.99.65.50 on April 21, 2012 - 16:04
RecentChanges · StartingPoints · About
Edit page ·Search · Related · Page info · Latest diff
[Welcome to Sensei's Library!]
RecentChanges
StartingPoints
About
RandomPage
Search position
Page history
Latest page diff
Partner sites:
Go Teaching Ladder
Goproblems.com
Login / Prefs
Tools
Sensei's Library