An example of removing a local threat

    Keywords: Ko
[Diagram]
White should play a preliminary move  



White can only win this fight via the ko: White is too short of liberties to make it a capturing race.

Before first capturing the ko White needs to play at W1, which will make Black answer at a. Then White can start the ko. There is no reason here for White to play W1 at a, reducing the size of the ko.

This is a special case of the principle that you remove double threats before starting the ko.


An example of removing a local threat last edited by Dieter on August 2, 2007 - 18:39
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