Just around the tree and then three turns towards the tree and then another turn around both lines. Easy peasy. I do the 4th turn on the other side of the three turns . Works just the same.
It's based on the Taught Line Hitch I believe ( look at about 6 mins 30 secs in)
[video=youtube;3X8drKsdf5E]https://www.youtube.com/watch?v=3X8drKsdf5E[/video]