The contention can be made that General Zaroff is, in fact, a dynamic character because he undergoes a change in his outlook on two occasions.
When Zaroff describes his dangerous game to Sanger Rainsford, he states that he gives his prey a supply of food and a hunting knife with a head start of three hours. If his prey eludes him three days, the man wins the game and goes free. If he finds his quarry, the other "loses."
However, Zaroff breaks his rules on two occasions:
1. On the first day the general tracks Rainsford to the tree in which he lies on a limb. Zaroff's sharp eyes run all the way up the trunk, but
...stopped before they reached the limb where Rainsford lay; a smile spread over his face.
Zaroff has found his prey; Rainsford has not eluded him. But, with horror running through him, Rainsford realizes that the general is prolonging his game, "saving him for another day's sport" instead. Zaroff has changed the rules just so he can enjoy the hunt longer.
2. When Rainsford appears in the general's private chambers on the evening of the third day, Zaroff praises him, saying, "I congratulate you. . . . You have won the game." But Rainsford wants to change the rules as he challenges Zaroff to a duel. Zaroff accepts, "Splendid! One of us is to furnish a repast for the hounds." This stipulation was not in the rules; Zaroff just wants to change them for the sake of getting to duel and satisfy Rainsford.