system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How did Yoda and Obi-Wan think that Luke could defeat a supremely powerful Sith Master and Sith Lord?
gpt
I think it was more a case of therr really is no one else left to even try. Obi-Wan was dead, and beyond Giving some advice, unable to do anything really. And Yoda was at the end of his life, while very knowledgeable and wise, at his weakness point ever. 

Frankly, they didn't have any other options.