The knit front back is a one-stitch neutral increase. It creates two stitches from one. The resulting stitches look like a knit and a purl stitch.
- Knit into the front loop of the next stitch on the left needle and leave the stitch worked into on the left needle.
- Knit into the back loop of the stitch already worked on the left needle and drop the stitch worked into from the left needle.