Assemble playing piece sandwiches RST and stitch around the edges with a 1⁄4” seam allowance, leaving a gap to turn the pieces inside out. Continue until you’ve sewn all 24 (12 of each color combination) playing piece sandwiches. Trim corners, making sure you don’t clip the corner stitches, and turn pieces inside out. Fold fabric down in the gap and press to smooth the edges. Top stitch around the entire square very close to the edges to ensure the gap is closed.