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The Beginning Chain

If the chart begins with a solid block
Add 3 chains for the turning chain, which counts as one double crochet at the beginning of the row. Then work a double crochet into each of the fourth, fifth, and sixth chains from the hook to form the first solid block.

If the chart begins with an open mesh
Add 5 chains (3 chains for the turning chain, which counts as the first double crochet at the beginning edge of the row, plus 2 chains for the chains of the open mesh). Work one double crochet into the eighth chain from the hook to form the first open mesh.

If the next square on the chart is a solid block
Work a double crochet into each of the next 3 chains.

If the next square on the chart is an open mesh
Chain 2, skip 2 chains, then work a double crochet into the next chain.

Turning Chains

If the first stitch is a solid block
Chain 3, which counts as the first double crochet of the row. Skip the first stitch of the previous row, then double crochet into each of the next 3 stitches of the previous row.

If the first stitch is an open mesh
Chain 5 (3 chains for the first double crochet of the row plus 2 chains for the first open mesh). Skip the first 3 stitches of the previous row, then double crochet into the next stitch.

Open Mesh Blocks

Working an open mesh over a previous open mesh block
Chain 2. Skipping the ch-2 space of the previous row, double crochet in the next double crochet.

Working an open mesh stitch over a solid block
Chain 2. Skipping the next 2 double crochet stitches of the previous row, double crochet in the next
double crochet.

Solid Blocks

Working a solid block over a mesh stitch
Work 2 double crochet stitches into the ch-2 space of the open mesh on previous row. Double crochet into the next double crochet.

Working a solid block over a solid block
Work 1 double crochet into each of the next 3 double crochet stitches.