Double Decrease: SK2P
The SK2P is one of the double decrease techniques used in knitting. It stands for:
Slip 1, Knit 2 together, Pass slipped stitch over
Sl 1, K2tog, PSSO
This decrease is very similar to the SKP decrease – the only difference is that the middle part has a K2tog instead of a single K stitch.
When you are considering which type of single decrease to use, you must consider whether it is a right-leaning or left-leaning decrease.
In the world of the double decreases, however, most of the time the designer wants a decrease that is centered: ideally, the right-hand stitch leans left over the center stitch, and the left-hand stitch leans right over the center stitch.
So for the SK2P double decrease, the initial slipped stitch will ultimately be passed over the center stitch, to make a left lean. And the K2tog makes a right lean, because the left-most stitch ends up on top of the center stitch.
So the double decrease looks balanced and centered. And in many knitting patterns, that is a good thing.
How to do SK2P
SK2P Step 1: Slip 1
Just like the SKP decrease, this slip stitch is done knitwise.
To slip one stitch knitwise: insert the working needle into the stitch on the holding needle as if you were going to knit, but instead, just transfer the stitch to the working needle.
Here is a photo of the Slip stitch in progress:
SK2P Step 2: Knit 2 together
Now, knit the next two stitches on the holding needle together. For more information, see the K2tog article.
This photo shows that the right-hand working needle has the stitch resulting from the K2Tog closest to its tip, and right next to it is the slipped stitch.
SK2P Step 3: Pass Slipped Stitch Over
The first two steps of this double decrease are done, and it is now time to do the PSSO (Pass Slipped Stitch Over).
Insert the holding (usually the left-hand needle) under that slipped stitch that is on the working needle, and lift it over the K2Tog stitch and over the tip of the right-hand needle.
This motion is used in the most common cast-off or bind-off method. I call it Leapfrog.
The Completed SK2P Double Decrease
This photo shows that the slipped stitch has now been passed over the K2Tog stitch, and it wraps nicely around the base of the K2Tog stitch.
Where there were three stitches on the left-hand needle, now there is only one stitch on the right-hand needle.