What obstacles does Rainsford use to stop Zaroff in "The Most Dangerous Game," and in what ways are they successful and unsuccesful?

Desperately trying to escape from Zaroff and his hounds,
Rainsford decided to try a few of the tricks he had learned from his travels around the
world. First, Rainsford

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... executed a series of intricate loops; he
doubled on his trail again and again, recalling all the lore of the fox hunt, the dodges
of the fox.

He climbed a tree
to rest, and when he awoke, he found that Zaroff had tracked him right to the tree. When
he saw Zaroff smile, he knew that the Cossack was merely toying with
him,

"...
saving him for another day's sport. The Cossack was the cat; he was the
mouse."

Rainsford's first
trap was a Malay mancatcher, in which one tree served as a trigger to cause a second
tree to crash from above. But Zaroff sensed it, and he was only slightly injured. Next,
Rainsford dug a Burmese tiger pit, with sharpened stakes at the bottom of a hidden
pit. It only claimed one of Zaroff's dogs. Finally, he
used

"... a
native trick he had learned in
Uganda..."

and attached his
knife to a sapling, tying it down with grapevine. This trick worked, killing Ivan, but
still Zaroff came on.