I’m making one small adjustment to a regular half double crochet to make this “rope look” stretch across the blanket I am designing. Instead of working into the top of the stitch, I am inserting my hook up the side of the stitch to make this modified half double crochet stitch.
Make this stitch with any number of chains, chain 2 and turn, and then work one row of regular HDC. Chain 2 and turn, and into the first stitch, the chain 2 does not count as a stitch, you’ll see a “V” facing you on the front or side of the work.
I made a short video clip to fully explain: