Gokyo Shumyo, Section 1, Problem 50 / Solution

[Diagram]
Main line  
[Diagram]
Continuation  

White cannot protect at a because of shortage of liberties and Black will make two eyes.


[Diagram]
Some more about the position 1  

Black's formation is a carpenter's square. The vital point of this shape is the marked point (2-2 point?). If White plays there instead of at the marked stone, the position becomes ko.

[Diagram]
Some more about the position 2  

Yohei: When all the outside liberties are filled, as is in this case, White a or b also make ko.


Go to Gokyo Shumyo, Section 1, Problem 51
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Gokyo Shumyo, Section 1, Problem 50 / Solution last edited by 82.237.225.189 on March 15, 2012 - 15:49
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