Tunisian Top Stitch and Variants

Tunisian Top stitch and variants all work into the top bump in the return pass chain.

Tunisian Top Stitch (Ttop)

Insert hook from front to back under the top bump in the return pass chain.
YO and draw up a loop.

Reverse Tunisian Top Stitch (Rtop)

With yarn in front, insert hook from back to front under the top bump in the return pass chain.
YO and draw up a loop.