The key detail is to not end up with a granny knot. The way you tie your initial overhand knot needs to match so that it sits correctly and doesn’t come untied.
It's really excellent, my shoes never come untied and I don't have to double-knot
Ian's Shoelace Site - >>35377589 - March 2023 (4 comments)
Ian Knot (2003) - >>27728002 - July 2021 (66 comments)
The “Granny Knot” - >>26867300 - April 2021 (255 comments)
C.I.A. Lacing (2014) - >>24091391 - Aug 2020 (89 comments)
Ian Knot - >>16454796 - Feb 2018 (47 comments)
Ian's Shoelace Site - >>13399095 - Jan 2017 (116 comments)
Shoelace knots - >>10200917 - Sept 2015 (43 comments)
Shoe Lacing Methods - >>9966073 - July 2015 (5 comments)
Shoelace Knots - >>1914731 - Nov 2010 (1 comment)
Fast. Easy. Clean. Shoelace Knot. - >>1063086 - Jan 2010 (41 comments)
How to tie world's fastest shoelace knot - >>111756 - Feb 2008 (11 comments)
It doesn't use the "Ian's Secure Shoelace Knot", but it shows that for the typical way of tying your shoes, there is a "strong form" and a "weak form", and shows you how to tell the difference.
I got lucky and have been tying the strong form my whole life, but it's sorta 50/50 depending on how you learn.
It is sad to see that Ian is struggling to fund the site: https://www.fieggen.com/shoelace/support.htm
I will also recycle a comment from there:
> There's a certain kind of sci-fi premise of "what if every intelligent species has something they're particularly good at."
> Naturally, most stories revolve around something impressive (or damning) for humanity like "war" or "kindness", but in the past I've wondered what kind of story one could make if the answer was "knots".
> Perhaps that's a question for mathematicians, and whether some facility for topological knot-thinking might be very handy in some kind of physics or engineering.