How did Zaroff's treatment of Rainsford change during the course of "The Most Dangerous Game"?

I don't believe Zaroff in any way changes his treatment of Rainsford during the story. Although Zaroff graciously wines and dines Rainsford before revealing his true intentions, Zaroff continues to treat Rainsford honorably, adhering to his own rules of the game without breaking them. Zaroff promises that Rainsford can have his freedom if Rainsford eludes him during the time that is established, and Zaroff keeps his word. When Zaroff returns to his home, he knows that he has lost the game, and there is no inclination that he will look for Rainsford further. Later, when they meet again, he tells Rainsford that "You have won the game." When Rainsford announces that a new game will begin, Zaroff accepts the terms.