There are two ways to work this method. While it is easier to close the gap with the second method (because the yarn is already in position to work together with the slipped stitch), it does use more yarn. For both methods, work the required number of stitches to the turning point, then turn the work.
Method 1: If the purl side is facing, slip the first stitch purlwise with the yarn in front (Figure 1); if the knit side is facing, slip the stitch with the yarn in back. When it's time to close the gap, pick up the stand of yarn below the slipped stitch (Figure 2), and work it together with the slipped stitch as for the yarnover method.
Method 2: Slip the first stitch purlwise while holding the working yarn over the needle (instead of in front or back of the needle), effectively executing a yarnover (Figure 3). Close the gap as for the yarnover method.