Work a row of ten vertical satin stitches over three fabric threads.

Start the second row by bringing your needle up three holes below the bottom of the last stitch.  Take your needle down in the same hole as the bottom of the last stitch to make a vertical satin stitch in line with the previous one.  Continue the row.

Complete the first block with a third row of satin stitches, and move onto the second block. This time, make three columns of ten horizontal satin stitches across three threads.

Start another block, this time working a row of ten vertical satin stitches like the first block.

Continue with two more rows of ten vertical satin stitches to complete the block.

Alternate the direction of stitches for each block in order to make a chessboard pattern.

Continue until the design area is filled.