For a while now, I have been studying the properties of physical knots with respect to tightening. It all started when I saw the Terry Moore TED talk on How to tie your shoes and the weak vs strong form of the simple shoelace knot. Today I found this handy paper: A 2-Chain Can Interlock with an Open 11-Chain
It may sound super boring and possibly intimidating, but it is short and has pictures!
Yay learning++ :-)