Dense Stitch Pattern with Half Double Crochet
The half double crochet is short and wide. So the pattern is made with these stitches is enough dense. The half double crochet make in both loops (under front and back loops). The first stitch crochet in 3rd chain from hook.
1 row: 2 turning chains, * half double crochet stitches *.
The rest of the rows make same as the first row.