Page 443 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"

5. Pull the two standing parts to tighten. Fair the knot so that the working ends are parallel and adjacent,
with each working end perpendicular and adjacent to its own standing part.

Untying: Both working ends are held under a crossing turn of R2. Lever this

down toward the working ends, then pull the ends free. R2 remains held by
an Overhand Knot in R1 which must then be loosened.

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