>>2361668Thanks, but although that one is a very good "slide and grip", it is not "in the bight".
https://en.wikipedia.org/wiki/Bight_(knot)#In_the_bight>knot can be formed without access to the ends of the ropeSee pic as an example of "in the bight".
Actually the third property is not needed so scratch that.
I would be surprised if I found out that this knot I'm looking for had not been invented. It would be very useful.