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S2KP is the abbreviation for Slip, Slip, Knit, Pass.
What it actually means is that you slip 2 stitches together knitwise and then knit 1 stitch. You then use the left needle tip to pass the two slipped stitches over the knitted stitch and off the right needle.
In fact, in some knitting patterns you may also see this decrease abbreviated as sl 2, k1, p2sso. However, all it is, is a basic double decrease.
In fact, you work a S2KP over 3 stitches. And as you decrease two stitches, you end up with just one.
The S2KP is also often referred to as a Centered Double Decrease, or a Vertical Double Decrease. This is because unlike most decreases, it doesn’t lean either to the left or the right.
Instead, it creates a center stitch and the stitches on either side lean toward the center stitch. This results in a center stitch that is slightly raised and more prominent.
Where to Use the S2KP Decrease
In fact, this double decrease is often used as a design feature. In addition, this stitch is often used at the base of v-neck openings.
Likewise, it is also a decrease technique that you can often find in many gorgeous lace patterns.
Whereas the S2KP is the most common way of decreasing as it is used on right-side rows, you can also make the decrease from the wrong-side row. It is then referred to as a S2PP (slip, slip, purl, pass).
If you need to quickly reduce the number of stitches, you can decrease on every row by alternating between these two techniques.
Conversely, if you require a slower reduction of stitches, you can knit several rows between each decrease row.
Either way, this centered, neutral decrease is a great double decrease technique to know.