We’ve made a decision to only use CDD (central double decrease) for all Knotions patterns. But, we also know that Sl2KP is often used and we want to clear up any confusion.
CDD and Sl2KP are EXACTLY the same. That’s right. CDD describes what the stitch is doing (it’s creating a central double decrease – that is, one stitch is being taken away from both sides of a center stitch) and Sl2KP describes *how* that stitch is knitted (Slip 2 sts together – like a k2tog, Knit the next stitch, then Pass both of the slipped stitches over that Knit stitch).
So, if you’re curious about one or the other, do yourself a favor and get familiar with both of them. We see both of these used in knitting patterns so we don’t see either being retired any time soon.
But again, if it’s a Knotions pattern, it’s going to have CDD in it. This wasn’t always the case, so some patterns in the archives still have the other. But for anything that we’re publishing now, it’s going to be CDD.