Tutorial: Half Double Crochet (hdc) June 2016 // by knotions// Leave a Comment This is a nice stitch that’s between the height of a single crochet and double crochet. Yarn over (yo) from back to front and insert your hook. Yo and pull a lp through. 3 lps on hook. Yo and pull through all lps. One half double crochet (hdc) made.