Page 607 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"
P. 607
3. Reach through the front of the right crossing turn and grab the right leg of the middle crossing turn.
Uses: shortening a line; bypassing a worn section; loop knot with two fixed loops
Pros: very strong; secure under constant load
Cons: insecure if subjected to movement or irregular loading
Untying: With load off the rope, pull the part of the original middle crossing
turn that runs directly between the left and right crossing turns, so that the
loops are drawn through the crossing turns.
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