How to Crochet Extended Single Crochet
Extended Single Crochet is abbreviated EXSC.
Step 1. Insert hook in stitch.
Step 2. Yarn over, and pull through the stitch.
Step 3. Yarn over and pull through the 1st loop on hook.
Step 4. Yarn over and pull through both loop on hook.
Note that in this tutorial I am using US stitch abbreviation. In UK stitch abbreviation it is called an Extended Double Crochet, abbreviated EXDC.