Round Turn and Two Half Hitches

This is a good way to tie off to an anchor point with a rope that is under tension.

How to Tie:

Just pull the taught rope to your anchor, and then make 2 wraps around it. Pinch the wraps to maintain tension and put 2 separate Half Hitches around the standing line. The hitches can be slipped as well; giving an easy quick release set-up. If the load is really heavy, an additional turn or two might be warranted. And more Half Hitches can be added for extra security. With a little practice, you'll be able to tie this and not lose any tension on your rope. That being said, I usually prefer to hold tension on a rope with a Trucker's Hitch, as its significantly more powerful, but sometimes this knot is perfect for the situation.