Variation on 'chain sinnet' knot to hold yacht, under strain

[Jonnow]

Last year I was in Croatia attempting to moor stern-to against a town dock in a 25 knot cross wind. The man on the dock to whom I threw my windward line to did a neat trick that I've not seen before. He could see that with the cross wind, I was busy trying to get other lines secured, so having run the line through a hoop on the dock - instead of throwing it straight back to me - he used what he later described as a variation of a Chain Sinnet knot to hold the boat quite happily until I was ready to take the line from him.
Having passed the line through the hoop once, he used the returning line to loop around the tensioned line in a similar fashion to a sinnet - and he held the boat on that line using one of the bights - quite a feat given the strain from the cross wind. Once I was ready to take the line, the great thing was that by releasing the bight, the whole thing collapsed easily - without the need to undo anything or unwind multiple loops. I have tried since to repeat the trick, but never quite managed to work out how he did it. He said its commonly used in the climbing world to lock off a line... any ideas?
Jonno

 

[knuterikt]

This one works.
Take the rope through the ring.
then with the bight go around the standing part and back through the ring the opposite way.
hold on the bight and rope is locked
you can secure it by doing one or two half hitches around the standing part
or just throw the end back to the boat and release the bight

its the ABOK #1852 tied with the bight.

 

[knuterikt]

I think the one you are looking for is this
https://en.m.wikipedia.org/wiki/Overhand_knot_with_draw-loop
Without the ring it's the start of chain sinnet.
I think the one described in my previous post is better because it can be loaded without jamming.

 

[Jonnow]

thanks for the suggestion - the first solution does look interesting - im going to test it out.... but actually thats not what he did - the benefit was that there was only one loop through the hoop and then its fed back towards the boat (which makes it v handy when the knot is collapsed) but held with a lattice of loops - when viewed it looks just like a series of sinnet loops, but the key difference is that it loops through the standing part of the rope...