The question "who wins the most dangerous game" (from Connell's "The Most Dangerous Game") can be looked at in two very specific ways.
First, one could consider Rainsford the winner. He is able to defeat Zaroff's challenge and win at the game of survival. Another way that Rainsford can be considered the winner is in regards to a conversation which takes place between Rainsford and Whitney.
"Don't talk rot, Whitney," said Rainsford. "You're a big-game hunter, not a philosopher. Who cares how a jaguar feels?"
"Perhaps the jaguar does," observed Whitney.
"Bah! They've no understanding."
"Even so, I rather think they understand one thing--fear. The fear of pain and the fear of death."
Here, a reader can see that, in the end, Rainsford is able to see the point of the jaguar. Rainsford has become the prey and truly understands the fear of death. In regards to this, Rainsford has won.
The second way to consider who has won the most dangerous game would be to examine Zaroff. Zaroff could be considered a winner of the game given he was able to find the most dangerous game ever: Rainsford.
"I wanted the ideal animal to hunt," explained the general. "So I said, `What are the attributes of an ideal quarry?' And the answer was, of course, `It must have courage, cunning, and, above all, it must be able to reason."'
"But no animal can reason," objected Rainsford.
"My dear fellow," said the general, "there is one that can."
Here, Zaroff recognizes the importance of finding the most dangerous game. He has done this in "acquiring" Rainsford (a renowned hunter himself). The fact that he was able to lure one of the most renowned hunters of the time can be considered a win.