Video Tutorial

Round 1: Chain 50
Round 2: 1 single crochet on each chain, 5 single crochet in the corner, single crochet to the other corner, 5 single crochet in the other corner
Round 3: Back loops only, single crochet to the corner. In the corner taking both loops *3 single crochet, chain 1, 3 single crochet*, back loops only single crochet to the other corner. In the corner taking both loops *3 single crochet, chain 1, 3 single crochet*
Rounds 4-9: Back loops only, single crochet to the corner. In the corner taking both loops *3 single crochet, chain 1, 3 single crochet*, back loops only single crochet to the other corner. In the corner taking both loops *3 single crochet, chain 1, 3 single crochet*