Do you think Zaroff plays fair? How would you change the rules to make things more fair?

In Zaroff's opinion, yes, he does give his prey a fair chance to survive.  Zaroff will make sure that his human prey are in top physical condition before beginning his hunt.  That seems fair.  At least he gives them a chance to actually be physically capable of running.  I also assume that he gives the prey at least a knife, because that is what he gave Rainsford.

the answer is somber

the switch in narration increases the proximity of the narrator to the main character and the reader can perceive information only through the filter of a single character.