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Back post double crochet stitches (abbreviated Bpdc) are a fun way to add texture to your crochet work. Here is the explanation of how to do this crochet stitch in written form, as well as a helpful video.
Back Post Double Crochet = Yarn over, insert your hook from back to front to back around the post of the stitch below, yarn over, pull up a loop, (yarn over, pull through 2 loops on hook) twice.
When you make a back post double crochet, from the other side of the work it will look like a front post double crochet. Once you’ve mastered the Bpdc, you can learn how to make a front post double crochet stitch.