system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] If there are only two Sith at any given time, and the apprentice kills the master (presumably) before he was taught everything the master knows, wouldn't the Sith get dumber and dumber over time?

Think of Sith alchemy, for example. Darth Plagueis and Darth Sidious practiced it. Darth Vader didn't - and if the Rule of Two continued on, Darth Vader's apprentice probably wouldn't even know what Sith alchemy was.
gpt
Yeah, but think about how wildly unlikely that is. An apprentice, with less knowledge of the Force, would find defeating a true Sith Lord very difficult, if not impossible. The only way you defeat a master is to become the master, and that comes with years and years of learning and tutelage as an apprentice.