Half Double Crochet Decrease for Wasurerarenbo

1. Yarn over
   
2. Insert your hook through the front loop of the next stitch and through both of the loops of the stitch after that (just like you’re about to do invisible single crochet decrease).
   
3. Pull your yarn through the first two loops so you will end up with 3 loops.
   
4. Yarn over, pull your yarn through the three loops simultaneously.