# Beginner Exercise 137 / Solution

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Pick a Ko

Now, black has a choice between securing the left and the right. If he secures the right, white can make a ko on the left, and likewise, if he secures the left, play on the right as follows:

unkx80: This sequence from to is my intended solution, because white will take the ko first.

letsrock: The solution might not work in all cases. If fills at and black wins the ko on the left he can also secure the left group with b.

xela: The solution "works" regardless of who wins the ko. Remember that if black wins the ko, it means that black has ignored a ko threat somewhere else. There are two outcomes: either white wins the ko and captures some stones shown on the diagram, or white loses the ko and takes profit in a different part of the board. Either outcome is better for white than the failure diagram below.

If Black secures left ( at , at )
Failure

If white plays this way, then all of black's stones live without black needing to ignore any ko threats.

Beginner Exercise 137 / Solution last edited by xela on October 22, 2022 - 07:19
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