Tsumego From Games 15 / Solution
unkx80: Herman has given the correct answer.
![[Diagram]](../../diagrams/10/6d6b464a8d78c505689999a0ac3db6ac.png)
Removing ko options.
Playing at 1 removes any chance of getting into ko. Black cannot play a, since White has one liberty more. If Black plays b, White plays c and vice-versa.