caranthir: Revisited this. Drawback ajis of of R17 also include a ko (although the aforementioned descend is still the primary means to punish). According to Katago, S17 is here over 3 points better than R17. Even S16 is about 2.5 points better. [This was an edit of an old message. There was a typo on coordinates.]
Your move has been added.