The extra round turn makes this knot very strong. 2 Round Turns & 2 Half Hitches doesn’t jam, but might come loose if the running end is not loaded. To avoid this happening, seize the ends with a twine. For additional security pull the knot tight before seizing.
ABoK #1720, #1721, #1784, #1834, #1835, #1836, #1883, #1884, #1910
Pass the rope around the post from behind.
Pass around the post two more times.
Continue around the post again.
Pass under the standing part, then over it and through the loop to make a half hitch. Make another half hitch the same way.
Seize the ends with a twine.
Tighten the knot.
2 Round Turns & 2 Half Hitches is complete.