You can start at either end . For this solution, I started at the right-hand piece .
Notice the loop is under the double-line of the cord . . . . . move it along the piece towards the left . . . . .
. . . . . all the way to the end . . . . . . . . . .and through the second hole at that end . . . . .
Wrap loop around second piece start traveling along its length
. . . . . to its furthest end start to go over that end . . . . .
come around the end . . . . . and head back the way you started
. . . . . going towards the second hole of the first piece . . . . .
. . . . . almost there, go up through the hole now you're top side of the double-line cord
. . . . . keep on traveling towards the start hole and over it . . . . .
. . . . . free the loop from the first hole . . . . . and then the second
You've now released the loop -- first half of the cord -- from the first piece entirely
Simple enough to now free the rest of the cord from the second piece
You're done ! Congratulations !
Great for displaying your prize puzzles in their special cabinets
. . . . . and a plethora of many other uses as well
“Puzzle solving is an art and a science, which involves the organization of patience and perserverence, within the framework of simplistic logic influences,
~ with a dab of intuitiveness and a slice of luck ~
for the purpose of effecting and augmenting creativity within an expressive matrix of imagination and three-dimensional spatial stimuli .”