Survivor knots, alpine butterfly knot

For one of my knots, I did an alpine butterfly. A butterfly knot would be good if you need the rope to be strong on both sides and to make it I think I would rate it a 4/5. To do the knot you need to put your rope into a figure eight and then get the top part of the eight and pull it under the rope that hasn't been used and then put it through the bottom bit of the eight and then pull and you know will be done.