Page 288 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"

6. To tighten, hold the working end together with the standing part and pull against the loop. Then release
the working end and pull the standing part against the loop.

Untying: Pull slack from both legs of the loop through the upper double
crossing turn.

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