Page 246 - Bob Holtzman "The Field Guide to Knots How to Identify.."

4. The finished knot has some of the Square Knot’s symmetry, in that both strands of the right end of the
rope pass under the bight of the left end, and both strands of the left end of the rope pass over the bight of
the right end. But where both working ends are on the same side of a Square Knot, the working ends are on
opposite sides of the Thief Knot—a subtle difference.

Untying: Pull the working-end sides of the bights in opposite directions.

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